Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 41
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

This paper presents a 3D finite element analysis of the effect caused by a blast inside a reinforced concrete tunnel. The simulated explosion was caused by the crash of a heavy vehicle transporting inflammable material (LPG). The finite element technique was used to analyze the structural problems on the tunnel reinforced concrete structure considering the fire action and the subsequent explosion (blast) effect, incorporating appropriate material models.
Through FEM software the tunnel behavior was described with regard to structural safety. Indeed, tunnels must be designed to withstand damage factors, so it is desirable that if such an explosion did occur, the tunnel should be able to return to service in safety as soon as possible with minor repairs. Therefore, following the presented analysis, the most important factors influencing the dynamic response and the damage of the structure could be identified. The simulation involved aspects of thermal analysis and structural problems and the tensions in the structure generated by the effect of temperature caused by the fire and by the blast overpressure were analyzed. Following this approach, the most important factors influencing the dynamic response and damage of structure can be identified and appropriate preventive measures can be designated.
Go to article

Bibliography

[1] F. Cirianni, G. Leonardi, and F. Scopelliti, “A methodology for assessing the seismic vulnerability of highway systems”, in: AIP Conference Proceedings, vol. 1020, no. 1, American Institute of Physics, pp. 864–871, 2008, DOI: 10.1063/1.2963925.
[2] J. Liu, Q. Yan, and J.Wu, “Analysis of blast wave propagation inside tunnel”, Transactions of Tianjin University, vol. 14, no. 5, pp. 358–362, 2008, DOI: 10.1007/s12209-008-0061-3.
[3] A. Van den Berg, and J. Weerheijm, “Blast phenomena in urban tunnel systems”, Journal of Loss Prevention in the Process Industries, vol. 19, no. 6, pp. 598–603, 2006, DOI: 10.1016/j.jlp.2006.03.001.
[4] D.B. Chang and C.S. Young, “Probabilistic estimates of vulnerability to explosive overpressures and impulses”, Journal of Physical Security, vol. 4, no. 2, pp. 10–29, 2010.
[5] M. Buonsanti, G. Leonardi, and F. Scopelliti, “3-D Simulation of shock waves generated by dense explosive in shell structures”, Procedia Engineering, vol. 10, pp. 1554–1559, 2011, DOI: 10.1016/j.proeng.2011.04.259.
[6] M. Buonsanti and G. Leonardi, “3-D simulation of tunnel structures under blast loading”, Archives of Civil and Mechanical Engineering, vol. 13, no. 1, pp. 128–134, 2013, DOI: 10.1016/j.acme.2012.09.002.
[7] ABAQUS Inc., ABAQUS Example Manual, 2014.
[8] ABAQUS Inc., ABAQUS Theory Manual, 2014.
[9] ABAQUS Inc., ABAQUS Analysis Manual, 2014.
[10] M.Nawar et al., “Numerical analysis of underground tunnels subjected to surface blast loads”, Frattura ed Integrità Strutturale, vol. 15, no. 55, pp. 159–173, 2020, DOI: 10.3221/IGF-ESIS.55.12.
[11] T. Lie and V. Kodur, “Thermal and mechanical properties of steel-fibre-reinforced concrete at elevated temperatures”, Canadian Journal of Civil Engineering, vol. 23, no. 2, pp. 511–517, 1996, DOI: 10.1139/l96-055.
[12] M.G. Van Geem, J. Gajda, and K. Dombrowski, “Thermal properties of commercially available high-strength concretes”, Cement, Concrete and Aggregates, vol. 19, no. 1, pp. 38–54, 1997, DOI: 10.1520/cca10020j.
[13] V. Kodur and M. Sultan, “Effect of temperature on thermal properties of high-strength concrete”, Journal of Materials in Civil Engineering, vol. 15, no. 2, pp. 101–107, 2003, DOI: 10.1061/(ASCE)0899-1561(2003)15:2(101).
[14] V.K. Kodur, M. Dwaikat, and M. Dwaikat, “High-temperature properties of concrete for fire resistance modeling of structures”, ACI Materials Journal, vol. 105, no. 5, p. 517, 2008.
[15] L. Guo, L. Guo, L. Zhong, and Y. Zhu, “Thermal conductivity and heat transfer coefficient of concrete”, Journal of Wuhan University of Technology, Materials Science Edition, vol. 26, no. 4, pp. 791–796, 2011, DOI: 10.1007/s11595-011-0312-3.
[16] V. Kodur, “Properties of concrete at elevated temperatures”, International Scholarly Research Notices, vol. 2014, 2014, DOI: 10.1155/2014/468510.
[17] European Committee, “Eurocode2: Design of concrete structures-Part 1-2: General rules-Structural fire design”, ENV 1992-1-2, 1995.
[18] J. Zehfuß et al., “Evaluation of Eurocode 2 approaches for thermal conductivity of concrete in case of fire”, Civil Engineering Design, vol. 2, no. 3, pp. 58–71, 2020.
[19] UNI 9502:2001 – Analytical fire resistance assessment of reinforced concrete and prestressed concrete structural elements, UNI – Ente Nazionale Italiano di Unificazione, Milano, Italy, 2001.
[20] T. Jankowiak and T. Lodygowski, “Identification of parameters of concrete damage plasticity constitutive model”, Foundations of civil and environmental engineering, vol. 6, no. 1, pp. 53–69, 2005.
[21] J.S. Tyau, “Finite element modeling of reinforced concrete using 3-dimensional solid elements with discrete rebar”, (Master of Science), Brigham Young University, 2009.
[22] Y. Dere and M.A. Koroglu, “Nonlinear FE modeling of reinforced concrete”, International Journal of Structural and Civil Engineering Research, vol. 6, no. 1, pp. 71–74, 2017.
[23] F. Lo Monte, N. Kalaba, and P. Bamonte, “On the extension of a plastic-damage model to high temperature and fire”, in IFireSS 2017-2nd International Fire Safety Symposium, Doppiavoce, pp. 703–710, 2017.
[24] N. Wahid, T. Stratford, and L. Bisby, “Calibration of concrete damage plasticity model parameters for high temperature modelling of reinforced concrete flat slabs in fire”, Applications of Structural Fire Engineering, Singapore, 2019.
[25] A.S. Genikomsou and M.A. Polak, “Finite element analysis of punching shear of concrete slabs using damaged plasticity model in ABAQUS”, Engineering Structures, vol. 98, pp. 38–48, 2015, DOI: 10.1016/j.engstruct. 2015.04.016.
[26] Forschungsgesellschaft für Straßen – und Verkehrswesen, Richtlinien für Ausstattung und Betrieb von Tunneln (RABT). Ausgabe, 1985.
[27] M. Masellis, “Fire disaster in a motorway tunnel”, Annals of Burns and Fire Disasters, vol. 10, no. 4, pp. 233–240, 1997.
[28] R.J. Proctor, “The San Fernando Tunnel explosion, California”, Engineering Geology, vol. 67, no. 1–2, pp. 1–3, 2002.
[29] S. Brambilla and D. Manca, “The viareggio LPG railway accident: event reconstruction and modelling”, Journal of Hazardous Materials, vol. 182, no. 1–3, pp. 346–357, 2010, DOI: 10.1016/j.jhazmat.2010.06.039.
[30] H. Ingason, Y.Z. Li, and A. Lönnermark, “Runehamar tunnel fire tests”, Fire Safety Journal, vol. 71, pp. 134–149, 2015.
[31] Instituut TNO voor Bouwmaterialen en Bouwconstructies, Rapport betreffende de beproeving van het gedrag van twee isolatiematerialenter bescherming van tunnels tegen brand (Rapport B-80-33). Delft, The Netherlands, 1980.
[32] B. Hemmatian, E. Planas, and J. Casal, “Fire as a primary event of accident domino sequences: the case of BLEVE”, Reliability Engineering and System Safety, vol. 139, pp. 141–148, 2015, DOI: 10.1016/j.ress.2015. 03.021.
[33] K.J. Root, “Development and verification of a confined discretized solid flame model for calculating heat flux on concrete tunnel liners”, 2018.
[34] H.R.Weibull, “Pressures recorded in partially closed chambers at explosion of TNT charges”, NYASA, vol. 152, no. 1, pp. 357–361, 1968, DOI: 10.1111/j.1749-6632.1968.tb11987.x.
[35] D.R. Curran, “Underground storage of ammunition: experiments concerning accidental detonation in an underground chamber”, Norwegian Defence Construction Service, 1966.
[36] A.C. Smith and M.J. Sapko, “Detonation wave propagation in underground mine entries”, Journal of the Mine Ventilation Society of South Africa, vol. 58, pp. 20–25, 2005.
[37] M. Silvestrini, B. Genova, and F. Leon Trujillo, “Energy concentration factor. A simple concept for the prediction of blast propagation in partially confined geometries”, Journal of Loss Prevention in the Process Industries, vol. 22, no. 4, pp. 449–454, 2009, DOI: 10.1016/j.jlp.2009.02.018.
[38] Center for chemical process safety, Guidelines for Evaluating the Characteristics of Vapor Cloud Explosions, Flash Fires and BLEVEs. American Institute of Chemical Engineers, 1994.
[39] J. Casal and J. M. Salla, “Using liquid superheating energy for a quick estimation of overpressure in BLEVEs and similar explosions”, Journal of Hazardous Materials, vol. 137, no. 3, pp. 1321–1327, 2006, DOI: 10.1016/ j.jhazmat.2006.05.001.
[40] B. Genova, M. Silvestrini, and F. L. Trujillo, “Evaluation of the blast-wave overpressure and fragments initial velocity for a BLEVE event via empirical correlations derived by a simplified model of released energy”, Journal of Loss Prevention in the Process Industries, vol. 21, no. 1, pp. 110–117, 2008, DOI: 10.1016/j.jlp.2007.11.004.
[41] S. Koneshwaran, “Blast response and sensitivity analysis of segmental tunnel”, PhD Thesis, Queensland University of Technology, 2014.
[42] R. Tiwari, T. Chakraborty, and V. Matsagar, “Dynamic analysis of underground tunnels subjected to internal blast loading”, World Congress of Computational Mechanics (WCCM XI), Barcelona. 2014.
[43] S. Koneshwaran, D. Thambiratnam, and C. Gallage, “Performance of buried tunnels subjected to surface blast incorporating fluid-structure interaction”, Journal of Performance of Constructed Facilities, 2015, DOI: 10.1061/ (ASCE)CF.1943-5509.0000585.
[44] M. Zaid and R. Sadique, “The response of rock tunnel when subjected to blast loading: finite element analysis”, Engineering Reports, 2021.
[45] D. Hyde, “CONWEP, Conventional Weapons Effects Program”, US Army Engineer Waterways Experiment Station, Vicksburg, MS, 1992.

Go to article

Authors and Affiliations

Giovanni Leonardi
1
ORCID: ORCID
Rocco Palamara
1
ORCID: ORCID
Federica Suraci
1
ORCID: ORCID

  1. Department of Civil, Energy, Environmental and Materials Engineering, University of Reggio Calabria, Via Graziella, Reggio Calabria, Italy
Download PDF Download RIS Download Bibtex

Abstract

Structural vibration damping via piezoelectric shunt circuits has received a great deal of attention recently as they are light, easy to use and provide for good vibration damping performance. This study investigates vibration damping of a clamped-free beam under harmonic excitations in the steady state. The damping control strategy utilises the piezoelectric properties of PZT materials and a shunt circuit consisting of series RLC elements in parallel configuration. The analysis was made for the first mode frequency and, at the same time, for the four resonance frequencies.
Go to article

Authors and Affiliations

Roman Filipek
Jerzy Wiciak
Download PDF Download RIS Download Bibtex

Abstract

A numerical method is developed for estimating the acoustic power of any baffled planar structure, which is vibrating with arbitrary surface velocity profile. It is well known that this parameter may be calculated with good accuracy using near field data, in terms of an impedance matrix, which is generated by the discretization of the vibrating surface into a number of elementary radiators. Thus, the sound pressure field on the structure surface can be determined by a combination of the matrix and the volume velocity vector. Then, the sound power can be estimated through integration of the acoustic intensity over a closed surface. On the other hand, few works exist in which the calculation is done in the far field from near field data by the use of radiation matrices, possibly because the numerical integration becomes complicated and expensive due to large variations of directivity of the source. In this work a different approach is used, based in the so-called Propagating Matrix, which is useful for calculating the sound pressure of an arbitrary number of points into free space, and it can be employed to estimate the sound power by integrating over a finite number of pressure points over a hemispherical surface surrounding the vibrating structure. Through numerical analysis, the advantages/disadvantages of the current method are investigated, when compared with numerical methods based on near field data. A flexible rectangular baffled panel is considered, where the normal velocity profile is previously calculated using a commercial finite element software. However, the method can easily be extended to any arbitrary shape. Good results are obtained in the low frequency range showing high computational performance of the method. Moreover, strategies are proposed to improve the performance of the method in terms of both computational cost and speed.

Go to article

Authors and Affiliations

Mario A. González-Montenegro
Roberto Jordan
Arcanjo Lenzi
Jorge P. Arenas
Download PDF Download RIS Download Bibtex

Abstract

Many imaging techniques are playing an increasingly significant role in clinical diagnosis. In the last years especially noninvasive electrical conductivity imaging methods have been investigated. Magnetoacoustic tomography with magnetic induction (MAT-MI) combines favourable contrast of electromagnetic tomography with good spatial resolution of sonography. In this paper a finite element model of MAT-MI forward problem has been presented. The reconstruction of the Lorentz force distribution has been performed with the help of a time reversal algorithm.
Go to article

Authors and Affiliations

Adam Ryszard Żywica
Download PDF Download RIS Download Bibtex

Abstract

This paper presents numerical two-dimensional results for fine-grained concrete under quasi-static three-point bending at meso-scale. Concrete was modelled as a random heterogeneous three-phase material. The simulations for notched concrete beams were carried out with the standard finite element method using an isotropic damage constitutive model enhanced by a characteristic length of micro-structure by means of a non-local theory. The effect of the volume fraction, shape, size, statistical distribution and stiffness of aggregate was analysed. Moreover, the effect of the bond thickness, notch size and characteristic length of micro-structure on the material behaviour was numerically investigated. The FE results were compared with own laboratory test results and other meso-scale calculations for three-phase concrete elements.

Go to article

Authors and Affiliations

Ł. Skarżyński
J. Tejchman
Download PDF Download RIS Download Bibtex

Abstract

This paper presents the numerical part of the research program on concrete-filled steel columns. Nonlinear, three dimensional FE analysis of axial compression, was conducted using the finite element program ABAQUS. The numerical results were validated through comparison with experimental data in terms of ultimate loading and deformation modes. Modeling related problems such as the definition of boundary conditions, imperfections, concrete-steel interaction, material representation and others are investigated using a comprehensive parametric study. The developed FE models will be used for an enhanced interpretation of experiments and for the predictive study of cases not included in the experimental testing.

Go to article

Authors and Affiliations

L. Kwaśniewski
E. Szmigiera
M. Siennicki
Download PDF Download RIS Download Bibtex

Abstract

In this paper we propose an original configuration of a compliant mini-gripper for handling chemicals. The compliant mini-gripper is 3D modeled and analyzed with finite element method. To use it in a wider range of containers designed for laboratories we made several variants of fasteners. In order to obtain a functional prototype in a scale appropriate to characterize the system, we determined the material properties of the gripper and developed an experimental stand for characterizing the system with mini-gripper. Finally, we compared the movements of the experimental grip, made according to the movement of the bellows type actuator, determined based on, analytical and numerical results.

Go to article

Bibliography

[1] A. Valera-Medina, A. Giles, D. Pugh, S. Morris, M. Pohl, and A. Ortwein. Investigation of combustion of emulated biogas in a gas turbine test rig. Journal of Thermal Science, 27:331–340, 2018. doi: 10.1007/s11630-018-1024-1.
[2] K. Tanaka and I. Ushiyama. Thermodynamic performance analysis of gas turbine power plants with intercooler: 1st report, Theory of intercooling and performance of intercooling type gas turbine. Bulletin of JSME, 13(64):1210–1231, 1970. doi: 10.1299/jsme1958.13.1210.
[3] H.M. Kwon, T.S. Kim, J.L. Sohn, and D.W. Kang. Performance improvement of gas turbine combined cycle power plant by dual cooling of the inlet air and turbine coolant using an absorption chiller. Energy, 163:1050–1061, 2018. doi: 10.1016/j.energy.2018.08.191.
[4] A.T. Baheta and S.I.-U.-H. Gilani. The effect of ambient temperature on a gas turbine performance in part load operation. AIP Conference Proceedings, 1440:889–893, 2012. doi: 10.1063/1.4704300.
[5] F.R. Pance Arrieta and E.E. Silva Lora. Influence of ambient temperature on combined-cycle power-plant performance. Applied Energy, 80(3):261–272, 2005. doi: 10.1016/j.apenergy.2004.04.007.
[6] M. Ameri and P. Ahmadi. The study of ambient temperature effects on exergy losses of a heat recovery steam generator. In: Cen, K., Chi, Y., Wang, F. (eds) Challenges of Power Engineering and Environment. Springer, Berlin, Heidelberg, 2007. doi: 10.1007/978-3-540-76694-0_9.
[7] M.A.A. Alfellag: Parametric investigation of a modified gas turbine power plant. Thermal Science and Engineering Progress, 3:141–149, 2017. doi: 10.1016/j.tsep.2017.07.004.
[8] J.H. Horlock and W.A. Woods. Determination of the optimum performance of gas turbines. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 214:243–255, 2000. doi: 10.1243/0954406001522930.
[9] L. Battisti, R. Fedrizzi, and G. Cerri. Novel technology for gas turbine blade effusion cooling. In: Proceedings of the ASME Turbo Expo 2006: Power for Land, Sea, and Air. Volume 3: Heat Transfer, Parts A and B. pages 491–501. Barcelona, Spain. May 8–11, 2006. doi: 10.1115/GT2006-90516.
[10] F.J. Wang and J.S. Chiou. Integration of steam injection and inlet air cooling for a gas turbine generation system. Energy Conversion and Management, 45(1):15–26, 2004. doi: 10.1016/S0196-8904 (03)00125-0.
[11] Z. Wang. 1.23 Energy and air pollution. In I. Dincer (ed.): Comprehensive Energy Systems, pp. 909–949. Elsevier, 2018. doi: 10.1016/B978-0-12-809597-3.00127-9.
[12] Z. Khorshidi, N.H. Florin, M.T. Ho, and D.E. Wiley. Techno-economic evaluation of co-firing biomass gas with natural gas in existing NGCC plants with and without CO$_2$ capture. International Journal of Greenhouse Gas Control, 49:343–363, 2016. doi: 10.1016/j.ijggc.2016.03.007.
[13] K. Mohammadi, M. Saghafifar, and J.G. McGowan. Thermo-economic evaluation of modifications to a gas power plant with an air bottoming combined cycle. Energy Conversion and Management, 172:619–644, 2018. doi: 10.1016/j.enconman.2018.07.038.
[14] S. Mohtaram, J. Lin, W. Chen, and M.A. Nikbakht. Evaluating the effect of ammonia-water dilution pressure and its density on thermodynamic performance of combined cycles by the energy-exergy analysis approach. Mechanika, 23(2):18110, 2017. doi: 10.5755/j01.mech.23.2.18110.
[15] M. Maheshwari and O. Singh. Comparative evaluation of different combined cycle configurations having simple gas turbine, steam turbine and ammonia water turbine. Energy, 168:1217–1236, 2019. doi: 10.1016/j.energy.2018.12.008.
[16] A. Khaliq and S.C. Kaushik. Second-law based thermodynamic analysis of Brayton/Rankine combined power cycle with reheat. Applied Energy, 78(2):179–197, 2004. doi: 10.1016/j.apenergy.2003.08.002.
[17] M. Aliyu, A.B. AlQudaihi, S.A.M. Said, and M.A. Habib. Energy, exergy and parametric analysis of a combined cycle power plant. Thermal Science and Engineering Progress. 15:100450, 2020. doi: 10.1016/j.tsep.2019.100450.
[18] M.N. Khan, T.A. Alkanhal, J. Majdoubi, and I. Tlili. Performance enhancement of regenerative gas turbine: air bottoming combined cycle using bypass valve and heat exchanger—energy and exergy analysis. Journal of Thermal Analysis and Calorimetry. 144:821–834, 2021. doi: 10.1007/s10973-020-09550-w.
[19] F. Rueda Martínez, A. Rueda Martínez, A. Toleda Velazquez, P. Quinto Diez, G. Tolentino Eslava, and J. Abugaber Francis. Evaluation of the gas turbine inlet temperature with relation to the excess air. Energy and Power Engineering, 3(4):517–524, 2011. doi: 10.4236/epe.2011.34063.
[20] A.K. Mohapatra and R. Sanjay. Exergetic evaluation of gas-turbine based combined cycle system with vapor absorption inlet cooling. Applied Thermal Engineering, 136:431–443, 2018. doi: 10.1016/j.applthermaleng.2018.03.023.
[21] A.A. Alsairafi. Effects of ambient conditions on the thermodynamic performance of hybrid nuclear-combined cycle power plant. International Journal of Energy Research, 37(3):211–227, 2013. doi: 10.1002/er.1901.
[22] A.K. Tiwari, M.M. Hasan, and M. Islam. Effect of ambient temperature on the performance of a combined cycle power plant. Transactions of the Canadian Society for Mechanical Engineering, 37(4):1177–1188, 2013. doi: 10.1139/tcsme-2013-0099.
[23] T.K. Ibrahim, M.M. Rahman, and A.N. Abdalla. Gas turbine configuration for improving the performance of combined cycle power plant. Procedia Engineering, 15:4216–4223, 2011. doi: 10.1016/j.proeng.2011.08.791.
[24] M.N. Khan and I. Tlili. New advancement of high performance for a combined cycle power plant: Thermodynamic analysis. Case Studies in Thermal Engineering. 12:166–175, 2018. doi: 10.1016/j.csite.2018.04.001.
[25] S.Y. Ebaid and Q.Z. Al-hamdan. Thermodynamic analysis of different configurations of combined cycle power plants. Mechanical Engineering Research. 5(2):89–113, 2015. doi: 10.5539/mer.v5n2p89.
[26] R. Teflissi and A. Ataei. Effect of temperature and gas flow on the efficiency of an air bottoming cycle. Journal of Renewable and Sustainable Energy, 5(2):021409, 2013. doi: 10.1063/1.4798486.
[27] A.A. Bazmi, G. Zahedi, and H. Hashim. Design of decentralized biopower generation and distribution system for developing countries. Journal of Cleaner Production, 86:209–220, 2015. doi: 10.1016/j.jclepro.2014.08.084.
[28] A.I. Chatzimouratidis and P.A. Pilavachi. Decision support systems for power plants impact on the living standard. Energy Conversion and Management, 64:182–198, 2012. doi: 10.1016/j.enconman.2012.05.006.
[29] T.K. Ibrahim, F. Basrawi, O.I. Awad, A.N. Abdullah, G. Najafi, R. Mamat, and F.Y. Hagos. Thermal performance of gas turbine power plant based on exergy analysis. Applied Thermal Engineering, 115:977–985, 2017. doi: 10.1016/j.applthermaleng.2017.01.032.
[30] M. Ghazikhani, I. Khazaee, and E. Abdekhodaie. Exergy analysis of gas turbine with air bottoming cycle. Energy, 72:599–607, 2014. doi: 10.1016/j.energy.2014.05.085.
[31] M.N. Khan, I. Tlili, and W.A. Khan. thermodynamic optimization of new combined gas/steam power cycles with HRSG and heat exchanger. Arabian Journal for Science and Engineering, 42:4547–4558, 2017. doi: 10.1007/s13369-017-2549-4.
[32] N. Abdelhafidi, İ.H. Yılmaz, and N.E.I. Bachari. An innovative dynamic model for an integrated solar combined cycle power plant under off-design conditions. Energy Conversion and Management, 220:113066, 2020. doi: 10.1016/j.enconman.2020.113066.
[33] T.K. Ibrahim, M.K. Mohammed, O.I. Awad, M.M. Rahman, G. Najafi, F. Basrawi, A.N. Abd Alla, and R. Mamat. The optimum performance of the combined cycle power plant: A comprehensive review. Renewable and Sustainable Energy Reviews, 79:459–474, 2017. doi: 10.1016/j.rser.2017.05.060.
[34] M.N. Khan. Energy and exergy analyses of regenerative gas turbine air-bottoming combined cycle: optimum performance. Arabian Journal for Science and Engineering, 45:5895–5905, 2020. doi: 10.1007/s13369-020-04600-9.
[35] A.M. Alklaibi, M.N. Khan, and W.A. Khan. Thermodynamic analysis of gas turbine with air bottoming cycle. Energy, 107:603–611, 2016. doi: 10.1016/j.energy.2016.04.055.
[36] M. Ghazikhani, M. Passandideh-Fard, and M. Mousavi. Two new high-performance cycles for gas turbine with air bottoming. Energy, 36(1):294–304, 2011. doi: 10.1016/j.energy.2010.10.040.
[37] M.N. Khan and I. Tlili. Innovative thermodynamic parametric investigation of gas and steam bottoming cycles with heat exchanger and heat recovery steam generator: Energy and exergy analysis. Energy Reports, 4:497–506, 2018. doi: 10.1016/j.egyr.2018.07.007.
[38] M.N. Khan and I. Tlili. Performance enhancement of a combined cycle using heat exchanger bypass control: A thermodynamic investigation. Journal of Cleaner Production, 192:443–452, 2018. doi: 10.1016/j.jclepro.2018.04.272.
[39] M. Korobitsyn. Industrial applications of the air bottoming cycle. Energy Conversion and Management, 43(9-12):1311–1322, 2002. doi: 10.1016/S0196-8904(02)00017-1.
[40] T.K. Ibrahim and M.M. Rahman. optimum performance improvements of the combined cycle based on an intercooler–reheated gas turbine. Journal of Energy Resources Technology, 137(6):061601, 2015. doi: 10.1115/1.4030447.
Go to article

Authors and Affiliations

Daniel Lates
Simona Noveanu
Csibi Vencel

Download PDF Download RIS Download Bibtex

Abstract

This paper deals with the modelling of traction linear induction motors (LIMs) for public transportation. The magnetic end effect inherent to these motors causes an asymmetry of their phase impedances. Thus, if the LIM is supplied from the three-phase symmetrical voltage, its phase currents become asymmetric. This effect must be taken into consideration when simulating the LIMs’ performance. Otherwise, when the motor phase currents are assumed to be symmetric in the simulation, the simulation results are in error. This paper investigates the LIM performance, considering the end-effect induced asymmetry of the phase currents, and presents a comparative study of the LIM performance characteristics in both the voltage and the current mode.

Go to article

Authors and Affiliations

Ryszard Pałka
Konrad Woronowicz
Jan Kotwas
Wang Xing
Hao Chen
Download PDF Download RIS Download Bibtex

Abstract

The paper aims was assessing risks of mandible fractures consequent to impacts or sport accidents. The role of the structural stiffness of mandible, related to disocclusion state, was evaluated using the finite element method. It has been assumed, that the quasi-static stress field, due to distributed forces developed during accidents, could explain the common types of mandibular fractures. Mandibular condyles were supposed jammed in the maxillary fossae. The force of 700 N, simulating an impact on mandible, has been sequentially applied in three distinct areas: centrally, at canine zone and at the mandibular angle. Clinically most frequent fractures of mandible were recognized through the analysis of maximal principal stress/strain fields. It has been shown that mandibular fracture during accidents can be analyzed at satisfactory level using linear quasi-static models for designing protections.

Go to article

Authors and Affiliations

J. Żmudzki
G. Chladek
K. Panek
P. Lipiński
Download PDF Download RIS Download Bibtex

Abstract

Titanium alloys are difficult-to-machine materials due to their complex mechanical and thermophysical properties. An essential factor in ensuring the quality of the machined surface is the analysis and recommendation of vibration processes accompanying cutting. The analytical description of these processes for machining titanium alloys is very complicated due to the complex adiabatic shear phenomena and the specific thermodynamic state of the chip-forming zone. Simulation modeling chip formation rheology in Computer-Aided Forming systems is a practical method for studying these phenomena. However, dynamic research of the cutting process using such techniques is limited because the initial state of the workpiece and tool is a priori assumed to be "rigid", and the damping properties of the fixture and machine elements are not taken into account at all. Therefore, combining the results of analytical modeling of the cutting process dynamics with the results of simulation modeling was the basis for the proposed research methodology. Such symbiosis of different techniques will consider both mechanical and thermodynamic aspects of machining (specific dynamics of cutting forces) and actual conditions of stiffness and damping properties of the “Machine-Fixture-Tool-Workpiece” system.
Go to article

Bibliography

[1] D. Ulutan and T. Ozel. Machining induced surface integrity in titanium and nickel alloys: A review. International Journal of Machine Tools and Manufacture, 51(3):250–280, 2011. doi: 10.1016/j.ijmachtools.2010.11.003.
[2] J.P. Davim (ed.). Machining of Titanium Alloys. Springer-Verlag, Berlin, 2014. doi: 10.1007/978-3-662-43902-9.
[3] M. Motyka, W. Zaja, and J. Sieniawski. Titanium Alloys – Novel Aspects of Their Manufacturing and Processing. IntechOpen, 2019.
[4] J.P. Davim (ed.). Surface Integrity in Machining. Springer, London, 2010. doi: 10.1007/978-1-84882-874-2.
[5] K. Cheng (ed.). Machining Dynamics. Fundamentals, Applications and Practices. Springer, London, 2009. doi: 10.1007/978-1-84628-368-0.
[6] T.L. Schmitz and K.S. Smith. Machining Dynamics. Frequency Response to Improved Productivity. Springer, New York, 2009. doi: 10.1007/978-0-387-09645-2.
[7] W. Cheng and J.C. Outeiro. Modelling orthogonal cutting of Ti-6Al-4 V titanium alloy using a constitutive model considering the state of stress. The International Journal of Advanced Manufacturing Technology, 119:4329–4347, 2022. doi: 10.1007/s00170-021-08446-9.
[8] M. Sima, and T. Özel. Modified material constitutive models for serrated chip formation simulations and experimental validation in machining of titanium alloy Ti–6Al–4V. I nternational Journal of Machine Tools and Manufacture, 50(11):943–960, 2010. doi: 10.1016/j.ijmachtools.2010.08.004.
[9] V. Stupnytskyy and I. Hrytsay. Comprehensive analysis of the product’s operational properties formation considering machining technology. Archive of Mechanical Engineering, 67(2):149–167, 2020. doi: 10.24425/ame.2020.131688.
[10] V. Stupnytskyy, I. Hrytsay, and Xianning She. Finite element analysis of thermal and stress-strain state during titanium alloys machining. In: Advanced Manufacturing Processes II. Lecture Notes in Mechanical Engineering, 629–639, Springer, 2021. doi: 10.1007/978-3-030-68014-5_61.
[11] M.K. Gupta, M.E. Korkmaz, M. Sarıkaya, G.M. Krolczyk, M. Günay and S. Wojciechowski. Cutting forces and temperature measurements in cryogenic assisted turning of AA2024-T351 alloy: An experimentally validated simulation approach. Measurement, 188:110594, 2022. doi: 10.1016/j.measurement.2021.110594.
[12] Y.-P. Liu and Y. Altintas. Predicting the position-dependent dynamics of machine tools using progressive network. Precision Engineering, 73: 409–422, 2022. doi: 10.1016/j.precisioneng.2021.10.010.
[13] A. Pramanik and G. Littlefair. Machining of titanium alloy (Ti-6Al-4V)—theory to application. Machining Science and Technology, 19(1):1–49, 2015. doi: 10.1080/10910344.2014.991031.
[14] W. Cheng, J. Outeiro, J.-P. Costes, R. M’Saoubi, H. Karaouni, L. Denguir, V. Astakhov, and F. Auzenat. Constitutive model incorporating the strain-rate and state of stress effects for machining simulation of titanium alloy Ti6Al4V. Procedia CIRP, 77:344–347, 2018. doi: 10.1016/j.procir.2018.09.031.
[15] S. Wojciechowski, P. Twardowski, and M. Pelic. Cutting forces and vibrations during ball end milling of inclined surfaces. P rocedia CIRP, 14:113–118, 2014. doi: 10.1016/j.procir.2014.03.102.
[16] D. Chen, J. Chen, and H. Zhou. The finite element analysis of machining characteristics of titanium alloy in ultrasonic vibration assisted machining. Journal of Mechanical Science and Technology, 35:3601–3618, 2021. doi: 10.1007/s12206-021-0731-9.
[17] Q. Yang, Z. Liu, Z. Shi, and B. Wang. Analytical modeling of adiabatic shear band spacing for serrated chip in high-speed machining. The International Journal of Advanced Manufacturing Technology. 71:1901–1908, 2014. doi: 10.1007/s00170-014-5633-x.
[18] A.Í.S. Antonialli, A.E. Diniz, and R. Pederiva. Vibration analysis of cutting force in titanium alloy milling. International Journal of Machine Tools and Manufacture. 50(1):65–74, 2010. doi: 10.1016/j.ijmachtools.2009.09.006.
[19] G. Korendyasev. An approach to modeling self-oscillations during metal machining based on a finite-element model with small amount of computing resources. Vibroengineering PROCEDIA, 32:6–12, 2020. doi: 10.21595/vp.2020.21437.
[20] J. Klingelnberg. Dynamics of machine tools. In: Klingelnberg, J. (ed.): Bevel Gear, pages 311–320, Springer Vieweg, 2016. doi: 10.1007/978-3-662-43893-0_8.
[21] Y. Petrakov, M. Danylchenko, and A. Petryshyn. Prediction of chatter stability in turning. Eastern-European Journal of Enterprise Technologies, 5(1):58–64, 2019. doi: 10.15587/1729-4061.2019.177291.
[22] S.K. Choudhury, N.N. Goudimenko, and V.A. Kudinov. On-line control of machine tool vibration in turning. International Journal of Machine Tools and Manufacture. 37(6):801–811, 1997. doi: 10.1016/S0890-6955(96)00031-4.
[23] A. Liljerehn. Machine Tool Dynamics. A constrained state-space substructuring approach. Ph.D. Thesis, Göteborg, Sweden, 2016.
[24] G.R. Johnson and W.N. Cook. A constitutive model and data for metals subjected to large strains. High rates and high temperatures. In 7th International Symposium on Ballistics, pages 541–547, Hague, Netherlands, 19–21 April 1983.
[25] Y. Zhang, J.C. Outeiro, and T. Mabrouki. On the selection of Johnson-Cook constitutive model parameters for Ti-6Al-4V using three types of numerical models of orthogonal cutting. Procedia CIRP, 31:112–117, 2015. doi: 10.1016/j.procir.2015.03.052.
[26] D. Yan, T. Wu, Y. Liu, and Y. Gao. An efficient sparse-dense matrix multiplication on a multicore system. In 17th International Conference on Communication Technology (ICCT), pages 1880–1883, Chengdu, China, 27-30 October 2017. doi: 10.1109/ICCT.2017.8359956.
[27] M. Binder, F. Klocke, and D. Lung. Tool wear simulation of complex shaped coated cutting tools. Wear, 330–331:600–607, 2015. doi: 10.1016/j.wear.2015.01.015.
[28] D. Alleyne and P. Cawley. A two-dimensional Fourier transform method for the measurement of propagating multimode signals. The Journal of the Acoustical Society of America, 89(3):1159–1168, 1991. doi: 10.1121/1.400530.
[29] C.M. Harris and A.G. Piersol. Harris' Shock and Vibration Handbook. McGraw-Hill, 2002.
[30] S.A. Sina, H.M. Navazi, and H. Haddadpour. An analytical method for free vibration analysis of functionally graded beams. Materials and Design, 30(3):741–747, 2009. doi: 10.1016/j.matdes.2008.05.015.
Go to article

Authors and Affiliations

Vadym Stupnytskyy
1
ORCID: ORCID
She Xianning
1
ORCID: ORCID
Yurii Novitskyi
1
ORCID: ORCID
Yaroslav Novitskyi
1
ORCID: ORCID

  1. Lviv Polytechnic National University, Lviv, Ukraine
Download PDF Download RIS Download Bibtex

Abstract

An automated procedure based on evolutionary computation and Finite Element Analysis (FEA) is proposed to synthesize the optimal distribution of nanoparticles (NPs) in multi-site injection for a Magnetic Fluid Hyperthermia (MFH) therapy. Evolution Strategy and Non dominated Sorting Genetic Algorithm (NSGA) are used as optimization procedures coupled with a Finite Element computation tool.

Go to article

Authors and Affiliations

Paolo Di Barba
Fabrizio Dughiero
Elisabetta Sieni
Download PDF Download RIS Download Bibtex

Abstract

Magnetic-geared permanent magnet (MGPM) electrical machine is a new type of machine by incorporating magnetic gear into PM electrical machine, and it may be in operation with low-speed, high-torque and direct-driven. In this paper, three types of MGPM machines are present, and a quantitative comparison among them is performed by finite element analysis (FEA). The magnetic field distribution, stable torque and back EMF are obtained at no-load. The results show that three types of MGPM machine are suitable for different application fields respectively according to their own advantages, such as high torque and back EMF, which form an important foundation for MGPM electrical machine research.
Go to article

Authors and Affiliations

Xiping Liu
Dong Chen
Liang Yi
Chao Zhang
Min Wang
Download PDF Download RIS Download Bibtex

Abstract

Liquid-liquid extraction provides an environmentally friendly process as an alternative to azeotropic distillation, pervaporation and reverse osmosis because these techniques require the use of large amounts of energy, may involve volatile organic compounds, and operation at high pressure.

Ionic liquids (ILs) continue to gain wide recognition as potential environmentally friendly solvents due to their unique properties. However due to their current high cost, their use in industry is seriously limited without an efficient methodology for recovery and recycle.

In this paper we describe an innovative methodology for a liquid-liquid extraction process based on an electrically induced emulsion of an ionic liquid as the extracting solvent dispersed in an organic mixture. This offers a most efficient exploitation of the solvent. On the other hand we present our own design of a pilot (semi-industrial) scale extractor based on this methodology and which demonstrates effective recovery of the ionic liquid. In order to achieve this goal we used a numerical modelling tool implemented using our own simulation software based on the finite element method. We also used our original previous experience with generating and investigating liquid-liquid electrosprays using phase Doppler anemometry. Finally we present recommendations for contactor geometry and for the preferred operating conditions for the extractor.

Go to article

Authors and Affiliations

Kamil Kamiński
Laurence R. Weatherley
Jerzy Petera
Download PDF Download RIS Download Bibtex

Abstract

An ancient forging device in Spain has been studied, namely the forge with a waterwheel and air-blowing tube or hydraulic trompe, found near the village of Santa Eulalia de Oscos (province of Asturias, Spain). Three procedures using ad hoc methods were applied: 3D modelling, finite element analysis (FEA), and computational-fluid dynamics (CFD). The CFD results indicated the proper functioning of the trompe, which is a peculiar device based on the Venturi effect to take in air. The maximum air volume flow rate supplied to the forge by the trompe was shown to be 0.091 m3/s, and certain parameters of relevance in the trompe design presented optimal values, i.e. offering maximum air-flow supply. Furthermore, the distribution of stress over the motion-transmission system revealed that the stress was concentrated most intensely in the cogs of the transmission shaft (a kind of camshaft), registering values of up to 7.50 MPa, although this value remained below half of the maximum admissible work stress. Therefore, it was confirmed that the oak wood from which the motion system and the trompe were made functioned properly, as these systems never exceeded the maximum admissible working stress, demonstrating the effectiveness of the materials used in that period.

Go to article

Authors and Affiliations

J.I. Rojas-Sola
J.B. Bouza-Rodríguez
A. Comesaña-Campos
Download PDF Download RIS Download Bibtex

Abstract

Anisotropic rotor configurations influenced by the presence of a large number of geometrical parameters in a permanent magnet assisted synchronous reluctance (PMASR) motor pose design challenges in obtaining a robust geometry satisfying the requirements of reduced torque ripple and high torque density. Therefore, the purpose of this work is to perform detailed geometrical sensitivity analysis of a 36 slot/4 pole permanent magnet assisted synchronous reluctance (PMASR) motor using h-indexing and level sensitivity analysis in order to specify a guideline for designers to prioritize the design variables for optimization. Systematic multi-level design optimization for multiple objectives is implemented by an NSGA-II algorithm aided by the finite element analysis tool, hardware prototyping and experimental validation. The optimized designs also exhibit better structural and thermal characteristics.

Go to article

Authors and Affiliations

V.S. Nagarajan
V. Kamaraj
S. Sivaramakrishnan
Download PDF Download RIS Download Bibtex

Abstract

The need to reduce pollutant emissions leads the engineers to design new aeronautic combustors characterized by lean burn at relatively low temperatures. This requirement can easily cause flame instability phenomena and consequent pressure pulsations which may seriously damage combustor’s structure and/or compromise its fatigue life.

Hence the need to study the combustor’s structural dynamics and the interaction between elastic, thermal and acoustic phenomena. Finite element method represent a largely used and fairly reliable tool to address these studies; on the other hand, the idealization process may bring to results quite far from the reality whereas too simplifying assumptions are made.

Constraints modelling represent a key-issue for all dynamic FE analyses; a wrong simulation of the constraints may indeed compromise entire analyses although running on very accurate and mesh-refined structural models.

In this paper, a probabilistic approach to characterize the influence of external constraints on the modal behaviour of an aircraft combustor-rig is presented. The finite element model validation was performed at first by comparing numerical and experimental results for the free-free condition (no constraints). Once the model was validated, the effect of constraints elasticity on natural frequencies was investigated by means of a probabilistic design simulation (PDS); referring to a specific tool developed in the ANSYS®software, a preliminary statistical analysiswas at performed via Monte-Carlo Simulation (MCS) method. The results were then correlated with the experimental ones via Response Surface Method (RSM).

Go to article

Authors and Affiliations

Francesco Amoroso
Angelo De Fenza
Giuseppe Petrone
Rosario Pecora
Download PDF Download RIS Download Bibtex

Abstract

Three-dimensional (3D) finite element analyses (FEA) are performed to simulate the local compression (LC) technique on the clamped single-edge notched tension (SE(T)) specimens. The analysis includes three types of indenters, which are single pair of cylinder indenters (SPCI), double pairs of cylinder indenters (DPCI) and single pair of ring indenters (SPRI). The distribution of the residual stress in the crack opening direction in the uncracked ligament of the specimen is evaluated. The outcome of this study can facilitate the use of LC technique on SE(T) specimens.

Go to article

Authors and Affiliations

Yifan Huang
Wenxing Zhou
Download PDF Download RIS Download Bibtex

Abstract

Several modelling techniques are currently available to analyse the efficiency of inter-digital transducers (IDTs) fabricated on piezoelectric substrates for producing surface acoustic wave (SAW) devices. Impulse response method, equivalent circuit method, coupling of modes, transmission matrix method, and numerical techniques are some of the popular ones for this. Numerical techniques permit modelling to be carried out with any number of finger electrode pairs with required boundary conditions on any material of interest. In this work, we describe numerical modelling of SAW devices using ANSYS to analyse the effect of mass loading, a major secondary effect of IDTs on the performance of SAW devices. The electrode thickness of the IDT influences the resonance frequency of the SAW delay line. The analysis has been carried out for different electrode materials, aluminium, copper, and gold, for different substrate materials, barium titanate (BaTiO3), X-Y lithium niobate (LiNbO3), lithium tantalate (LiTaO3), and the naturally available quartz. The results are presented and discussed.
Go to article

Authors and Affiliations

Sheeja P. George
1 2
ORCID: ORCID
Johney Issac
2
Jacob Philip
3

  1. Department of Electronics, College of Engineering, Chengannur, Kerala, India
  2. Department of Instrumentation, CUSAT, Kochi, Kerala, India
  3. Amaljyothi College of Engineering, Kanjirappally, Kottayam, Kerala, India
Download PDF Download RIS Download Bibtex

Abstract

Featured with a higher velocity, increased power handling capability, and better aging behavior, surface transverse wave (STW) shows more promising prospects than Rayleigh wave nowadays in various sensing applications. The need to design, optimize, and fabricate the related devices motivates the development of modeling and simulation. For this reason, a three-dimensional (3D) finite element (FE) simulation of STW on quartz, considering the crystal cut angle and the electrode effects, is presented in this study. Firstly, we investigated the effects of quartz’s cut angle on the generated waves. Here, the polarized displacements were analyzed to distinguish the wave modes. Secondly, the investigations of the electrode effects on the polarized displacement, phase velocity, and electromechanical coupling factor ( K2) were carried out, for which different material and thickness configurations for the electrodes were considered. Thirdly, to examine the excitation conditions of the generated waves, the admittance responses were inspected. The results showed that not only the crystal cut angle but also the density and the acoustic impedance of the interdigital transducer (IDT) material have a strong influence on the excited waves. This article is the first to analyze STWs considering quartz’s cut angle and electrode effect through a 3D FE model. It could provide a helpful and easy way to design, optimize, and fabricate the related surface acoustic wave devices.
Go to article

Authors and Affiliations

Chao Jiang
1 2 3
Xiaoli Cao
1 2
Feng Yang
1 2 3
Zejun Liu
1

  1. School of Computer Science and Information Engineering, Chongqing Technology and Business University, Chongqing, China
  2. Chongqing Key Laboratory of Intelligent Perception and Blockchain Technology, Chongqing Technology and Business University, Chongqing, China
  3. Chongqing Engineering Laboratory for Detection, Control and Integrated System, Chongqing Technology and Business University, Chongqing, China
Download PDF Download RIS Download Bibtex

Abstract

This paper presents an algorithm and optimization procedure for the optimization of the outer rotor structure of the brushless DC (BLDC) motor. The optimization software was developed in the Delphi Tiburón development environment. The optimization procedure is based on the salp swarm algorithm. The effectiveness of the developed optimization procedurewas compared with genetic algorithm and particle swarmoptimization algorithm. The mathematical model of the device includes the electromagnetic field equations taking into account the non-linearity of the ferromagnetic material, equations of external supply circuits and equations of mechanical motion. The external penalty function was introduced into the optimization algorithm to take into account the non-linear constraint function.
Go to article

Authors and Affiliations

Łukasz Knypiński
1
ORCID: ORCID
Ramesh Devarapalli
2
ORCID: ORCID
Yvonnick Le Menach
3
ORCID: ORCID

  1. Poznan University of Technology, Poland
  2. Department of EEE, Lendi Institute of Engineering and Technology, Vizianagaram, India
  3. Lille University, France
Download PDF Download RIS Download Bibtex

Abstract

The following work gives the details of the modelling, simulation, and testing of a small portable gravitational water vortex (GWV) based power plant. The gravitation water vortex is an ideal source of renewable energy for rural areas that have a small body of flowing water. For this purpose, we have selected a small size for the vortex chamber that enables it to form a vortex with limited amounts of water. The paper gives the details of the simulation of the GWV in COMSOL FEA software and the parameters that were chosen for optimization. These parameters were the height of the vortex chamber, the number of blades, the length of the blades, and the tilt angle of the blades. These parameters were systematically varied step by step, to observe their effect on the speed of the rotor. The results of the parametric sweep that was performed on all the parameters are also presented. Based on the simulation results an optimal set of parameters was chosen for the physical implementation of the GWV. The paper also goes into the details of the construction of the physical GWV, the experimental setup that was devised for the testing and verification of the simulation results.
Go to article

Authors and Affiliations

Vinayakumar B.
1
ORCID: ORCID
Rahul Antonyo
1
ORCID: ORCID
Binson V.A.
1
ORCID: ORCID
Youhan Sunnyo
1
ORCID: ORCID

  1. Saintgits College of Engineering, Pathamuttom P.O Kottayam, Kerala, India Pincode: 686532
Download PDF Download RIS Download Bibtex

Abstract

The paper evaluates the causes related to the fatigue damage in a conveyor slide plate, exposed to high-frequency cyclic loads. The plate was made of 1.4301 acid-resistant steel. The fractography showed that the plate failure was caused by fatigue crack. A nonlinear analysis of plate deformation was conducted using the finite element method (FEA) in LS-Dyna software. The maximum normal stresses in the plate fracture were used in further analysis. A “fatigue limit” calculated initially using a FITNET procedure was above the maximum stress calculated using FEA. It indicates that the structural features of the plate were selected correctly. The experimental test results for 1.4301 acid-resistant steel were described using a probabilistic Weibull distribution model. Reliability was determined for the obtained S-N curve at 50% and 5% failure probability allowing for the selected coefficients (cycle asymmetry, roughness, variable load) and the history of cyclic loading. Cumulative damage was determined using the Palmgren-Miner hypothesis. The estimated fatigue life was similar to the actual value determined in the operating conditions for the S-N curve at 5% failure probability. For engineering calculations, the S-N curve at max. 5% failure probability is recommended.

Go to article

Authors and Affiliations

T. Tomaszewski
P. Strzelecki
M. Wachowski
ORCID: ORCID
M. Stopel
Download PDF Download RIS Download Bibtex

Abstract

This paper details a finite element analysis of the behaviour of Si-Al geopolymer concrete beam reinforced steel bar under an impulsive load and hyper velocity speed up to 1 km/s created by an air blast explosion. The initial torsion stiffness and ultimate torsion strength of the beam increased with increasing compressive strength and decreasing stirrup ratio. The study involves building a finite element model to detail the stress distribution and compute the level of damage, displacement, and cracks development on the geopolymer concrete reinforcement beam. This was done in ABAQUS, where a computational model of the finite element was used to determine the elasticity, plasticity, concrete tension damages, concrete damage plasticity, and the viability of the Johnson-Cook Damage method on the Si-Al geopolymer concrete. The results from the numerical simulation show that an increase in the load magnitude at the midspan of the beam leads to a percentage increase in the ultimate damage of the reinforced geopolymer beams failing in shear plastic deformation. The correlation between the numerical and experimental blasting results confirmed that the damage pattern accurately predicts the response of the steel reinforcement Si-Al geopolymer concrete beams, concluded that decreasing the scaled distance from 0.298 kg/m3 to 0.149 kg/m3 increased the deformation percentage.
Go to article

Authors and Affiliations

Nurul Aida Mohd Mortar
1 2
ORCID: ORCID
Mohd Mustafa Al Bakri Abdullah
1 2
ORCID: ORCID
Kamarudin Hussin
1
ORCID: ORCID
Rafiza Abdul Razak
3
ORCID: ORCID
Sanusi Hamat
4
ORCID: ORCID
Ahmad Humaizi Hilmi
4
Noorfifi Natasha Shahedan
1
ORCID: ORCID
Long Yuan Li
5
ORCID: ORCID
Ikmal Hakem A. Aziz
1
ORCID: ORCID

  1. Universiti Malaysia Perlis, Center of Excellence Geopolymer and Green Technology (CEGeoGTech), Malaysia
  2. Universiti Malaysia Perlis (UniMAP), Faculty of Chemical Engineering Technology, Malaysia
  3. Universiti Malaysia Perlis (UniMAP), Faculty of Civil Engineering Technology, Malaysia
  4. Universiti Malaysia Perlis (UniMAP), Faculty of Mechanical Engineering Technology, Malaysia
  5. University of Plymouth, School of Marine Science and Engineering, Plymouth PL4 8AA, United Kingdom

This page uses 'cookies'. Learn more