Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 8
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

The axial crumpling of frusta in the axisymmetric "concertina" mode is examined. A new theoretical model is developed in which the inward folding in both cylinders and frusta is addressed. The results were compared with previous relevant models as well as experimental findings. The flexibility of the model was substantiated by its capability of describing and estimating the inward folding in frusta in general as well as in cylinders as a special case. A declining trend of the eccentricity dependence with the D/t ratio was found in contrast with a previous theory which suggests total independency. ABAQUS 14-2 finite element software was employed to simulate the thin tube as a 3-D thin shell part. Numerical simulations of the process were found to, firstly, underestimate the theoretical values of inward folding in general, secondly anticipate more underestimations as the tubes become thinner and/or have larger apex angle, and finally anticipate as low as 300 apical angle frusta to revert its mode of deformation to global inversion.
Go to article

Bibliography

[1] F.C. Bardi and S. Kyriakides. Plastic buckling of circular tubes under axial compression–part I: Experiments. International Journal of Mechanical Sciences, 48(8):830–841, 2006. doi: 10.1016/j.ijmecsci.2006.03.005.
[2] J.M. Alexander. An approximate analysis of the collapse of thin cylindrical shells under axial loading. The Quarterly Journal of Mechanics and Applied Mathematics, 13(1):10–15, 1960. doi: 10.1093/qjmam/13.1.10.
[3] A.A.K. Mohammed, M.N. Alam, and R. Ansari. Quasi-static study of thin aluminium frusta with linearly varying wall-thickness. International Journal of Crashworthiness, 25(5):473–484, 2020. doi: 10.1080/13588265.2019.1613762.
[4] A. Shiravand and M. Asgari. Hybrid metal-composite conical tubes for energy absorption; theoretical development and numerical simulation. Thin-Walled Structures, 145:106442, 2019. doi: 10.1016/j.tws.2019.106442.
[5] P. Sadjad, E.M. Hossein, and E.M. Sobhan. Crashworthiness of double-cell conical tubes with different cross sections subjected to dynamic axial and oblique loads. Journal of Central South University, 25:632–645, 2018. doi: 10.1007/s11771-018-3766-z.
[6] G. Lu , J.L. Yu , J.J. Zhang, and T.X. Yu. Alexander revisited: upper- and lower-bound approaches for axial crushing of a circular tube. International Journal of Mechanical Sciences, 206:106610, 2021. doi: 10.1016/j.ijmecsci.2021.106610.
[7] A. Sadighi, A. Eyvazian, M. Asgari, and A.M. Hamouda. A novel axially half corrugated thin-walled tube for energy absorption under axial loading. Thin-Walled Structures, 145:106418, 2019. doi: 10.1016/j.tws.2019.106418.
[8] M.Y. Abbood, and R.N. Kiter. On the peak quasi-static load of axisymmetric buckling of circular tubes. International Journal of Crashworthiness, 27(2):367–375, 2022. doi: 10.1080/13588265.2020.1807679.
[9] T. Wierzbicki, S.U. Bhat, W. Abramowicz, and D. Brodkin. Alexander revisited–-A two folding elements model of progressive crushing of tubes. International Journal of Solids and Structures, 29(4):3269–3288, 1992. doi: 10.1016/0020-7683(92)90040-Z.
[10] A.A. Singace, H. Elsobky, and T.Y. Reddy. On the eccentricity factor in the progressive crushing of tubes. International Journal of Solids and Structures, 32(24):3589-3602, 1995. doi: 10.1016/0020-7683(95)00020-B.
[11] H.E. Postlethwaite and B. Mills. Use of collapsible structural elements as impact isolators, with special reference to automotive applications. The Journal of Strain Analysis for Engineering Design, 5(1):58–73,1970. doi: 10.1243/03093247V051058.
[12] A.G. Mamalis, D.E. Manolakos, S. Saigal, G. Viegelahn, and W. Johnson. Extensible plastic collapse of thin-wall frusta as energy absorbers. International Journal of Mechanical Sciences, 28(4):219–229, 1986. doi: 10.1016/0020-7403(86)90070-6.
[13] A.G. Mamalis, D.E. Manolakos, G.L. Viegelahn, and W. Johnson. The modeling of the progressive extensible plastic collapse of thin-wall shells. International Journal of Mechanical Sciences, 30(3-4):249–261, 1988. doi: 10.1016/0020-7403(88)90058-6.
[14] N.K. Gupta, G.L. Prasad, and S.K. Gupta. Plastic collapse of metallic conical frusta of large semi-apical angles. International Journal of Crashworthiness, 2(4):349–366, 1997. doi: 10.1533/cras.1997.0054.
[15] A.A.A. Alghamdi, A.A.N. Aljawi, and T.M.N. Abu-Mansour. Modes of axial collapse of unconstrained capped frusta. International Journal of Mechanical Sciences, 44(6):1145–1161, 2002. doi: 10.1016/S0020-7403(02)00018-8.
[16] N.M. Sheriff, N.K. Gupta, R. Velmurugan, and N. Shanmugapriyan. Optimization of thin conical frusta for impact energy absorption. Thin-Walled Structures, 46(6):653–666, 2008. doi: 10.1016/j.tws.2007.12.001.
Go to article

Authors and Affiliations

Riyah N. Kiter
1
Mazin Y. Abbood
1
ORCID: ORCID
Omar H. Hassoon
2
ORCID: ORCID

  1. Department of Mechanical Engineering, College of Engineering, University of Anbar, Iraq
  2. Department of Production and Metallurgy Engineering, University of Technology, Baghdad, Iraq
Download PDF Download RIS Download Bibtex

Abstract

The durability of building structures reinforced by steel is one of the main concerns in civil engineering. Currently, research in the field is focused on the possibility of replacing steel with relatively corrosion-resistant reinforcement, such as BFRP (Basalt Fiber Reinforced Polymers) bars. The behaviour of BFRP bars during compression has not yet been determined. The experimental results pertaining to BFRP bars subjected to compression were presented and discussed in the paper. The research program involved the preparation of 45 BFRP samples with varying unbraced length and nominal diameter of 8 mm that were subjected to compression. For samples with the unbraced length of up to 85 mm, the destruction was caused by crushing. The bars with the unbraced length greater than 120 mm were destroyed as a result of global buckling of the bar and subsequent fiber kinking. Based on the relationship between the buckling load strength – unbraced length, the optimal unbraced length of BFRP bar was determined, for which buckling load strength reaches its maximum value. The buckling load strength decreased, as the unbraced length increased. The values of modulus of elasticity under compression for variable unbraced lengths were slightly different for the samples, and were similar to the modulus of elasticity obtained at the tensile testing. The relationship between the buckling load strength and the unbraced length of BFRP bars was determined. This may contribute to the optimization of the transverse reinforcement spacing in compressed elements and to the development of standard provisions in the area of elements reinforced with FRP bars being subjected to compression.
Go to article

Authors and Affiliations

Marek Urbański
1
ORCID: ORCID
Kostiantyn Protchenko
1
ORCID: ORCID

  1. Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
Download PDF Download RIS Download Bibtex

Abstract

The paper proposes a new electropulse apparatus for processing natural raw materials. The temperature of the crushing-and-reducing assembly of an electropulse plant is found. The results of ore crushing are presented and optimal engineering factors are offered. The elemental analysis of the test material is obtained. It is reported that the electropulse processing at the reduction stage made for significant increase in the content of non-ferrous and rare metals.

Go to article

Authors and Affiliations

B.R. Nussupbekov
A.K. Khassenov
D.Zh. Karabekova
I.P. Kurytnik
A.Sh. Kazhikenova
Download PDF Download RIS Download Bibtex

Abstract

This study explores the influence of alkali activators on the initiation of polymerization reaction of alumino-silicate minerals present in class-F fly ash material. Different types of fly ash aggregates were produced with silicate rich binders (bentonite and metakaolin) and the effect of alkali activators on the strength gain properties were analyzed. A comprehensive examination on its physical and mechanical properties of the various artificial fly ash aggregates has been carried out systematically. A pelletizer machine was fabricated in this study to produce aggregate pellets from fly ash. The efficiency and strength of pellets was improved by mixing fly ash with different binder materials such as ground granulated blast furnace slag (GGBS), metakaolin and bentonite. Further, the activation of fly ash binders was done using sodium hydroxide for improving its binding properties. Concrete mixes were designed and prepared with the different fly ash based aggregates containing different ingredients. Hardened concrete specimens after sufficient curing was tested for assessing the mechanical properties of different types concrete mixes. Test results indicated that fly ash -GGBS aggregates (30S2‒100) with alkali activator at 10M exhibited highest crushing strength containing of 22.81 MPa. Similarly, the concrete mix with 20% fly ash-GGBS based aggregate reported a highest compressive strength of 31.98 MPa. The fly ash based aggregates containing different binders was found to possess adequate engineering properties which can be suggested for moderate construction works.

Go to article

Authors and Affiliations

P. Gomathi
A. Sivakumar
Download PDF Download RIS Download Bibtex

Abstract

The study presents an attempt at increasing the effectiveness of the crushing process through the application of a new original crumbling system. In the process of crushing materials, friction is present in many crushers as extremely significant or even dominating factor. The proposed construction solution is characterized by the occurrence – always on one of the working surfaces – of the static friction factor, and thus a friction that is greater than the kinetic friction.

Go to article

Authors and Affiliations

Feliks Chwarścianek
Download PDF Download RIS Download Bibtex

Abstract

In this study, the compressive deformation of crushed sandstone was tested using a crushed rock deformation-seepage test system, and the effects of various factors, including crushed rock grade, grade combination, water saturation status, and stress loading method (i.e., continuous loading or cyclic loading and unloading), on the compressive deformation of crushed sandstone was analyzed from four perspectives including stress-strain, bulking coefficient, deformation mechanism and energy dissipation. The results indicate that the stress-strain relations of crushed sandstone are closely associated with all factors considered, and are well represented by exponential functions. The strain observed for a given applied stress increased with increasing crushed rock grade throughout the loading period. Crushed sandstone grades were combined according to a grading index (n), where the proportion of large-grade rocks in the sample increased with increasing n. The bearing capacity of a water-saturated crushed sandstone sample with n = 0.2 was less than that of an equivalent dry sample for a given applied stress. The stress-strain curve of a water-saturated crushed sandstone sample with n = 0.2 under cyclic loading and unloading was similar to that obtained under continuous loading. Observation and discovery, the deformation mechanism of crushed sandstone was mainly divided into four stages, including crushing, rupture, corner detachment and corner wear. And 20% of the work done by testing machine is used for friction between the crushed sandstone with the inner wall of the test chamber, and 80% is used for the closing of the void between the crushed sandstone, friction sliding, crushing damage.

Go to article

Authors and Affiliations

Yanan Sun
Peisen Zhang
ORCID: ORCID
Wei Yan
ORCID: ORCID
Fenqian Yan
Junda Wu
Download PDF Download RIS Download Bibtex

Abstract

In the last 20 years, a new meshless computational method has been developed that is called peridynamics. The method is based on the parallelized code. The subject of the study is the deformation of open-cell copper foams under dynamic compression. The computational model of virtual cellular material is considered. The skeleton structure of such a virtual cellular material can be rescaled according to requirements. The material of the skeleton is assumed as the oxygen free high conductivity (OFHC) copper. The OFHC copper powder can be applied in additive manufacturing to produce the open-cell multifunctional structures, e.g., crush resistant heat exchangers, heat capacitors, etc. In considered peridynamic computations the foam skeleton is described with the use of an elastic-plastic model with isotropic hardening. The dynamic process of compression and crushing with different impact velocities is simulated.

Go to article

Authors and Affiliations

E. Postek
R.B. Pęcherski
Z. Nowak
Download PDF Download RIS Download Bibtex

Abstract

Environmental problems are considered a serious situation in modern construction. Reusing and recycling glass wastes is the only method to decrease waste produced. There is growing environmental compression to decrease glass waste and to reprocess as much as possible. In this investigational work, the effect of partially substituting crushed waste glass in concrete is considered. The study investigates crushed waste glass used as a partial replacement of fine aggregate for new concrete. recycled glass waste was partially replaced as 5%, 10%, 15%, 20%, 25%, 30, 35, 40%, 45%, 45% and 50% and tested at 7, 14 and 28 days of curing at 20◦ for mechanical properties and compared with those of controlled mix. The compressive strength, splitting tensile strength and flexural forces and static elasticity modulus of specimens with 20% waste glass content was 30%, 19.41%, 9.13% and 10.12%, respectively, which is higher than the controlled mix at 28 days. The outcomes displayed that the maximum rise in strength of concrete occurred when 20% replacement with glass crush. It is found that crushed waste glass can be used as fine aggregate replacement material in concrete production.
Go to article

Bibliography

[1] S.S.C Alharishawi, H.Abd, and S.Abass, “Employment of recycled wood waste in lightweight concrete production”, Archives of Civil Engineering, vol. 4, no. 20, 2020, DOI: 10.24425/ace.2020.135244.
[2] A.M. Al-hafiz, S.S. Chiad and M.S. Farhan, “Flexural strength of reinforced concrete one-way opened slabs with and without strengthening”, Australian, Journal of Basic and Applied Sciences, vol. 7, no. 6, pp. 642–651, 2013.
[3] S.M. Omaran et al., “Integrating BIM and game engine for simulation interactive life cycle analysis visualization”, Computing in Civil Engineering, Visualization, Information Modeling, and Simulation. Reston, VA: American Society of Civil Engineers, pp. 120–128, 2019.
[4] S.S. Chiad, “Shear stresses of hollow concrete beams”, Journal of Applied Sciences Research, vol. 9, no. 4, pp. 2880–2889, 2013.
[5] I.B. Topçu and M. Canbaz, “Properties of concrete containing waste glass”, Cement and Concrete Research Journal, vol. 34, pp. 267–274, 2004.
[6] S.C.Kou and C.S. Poon, “Properties of self-compacting concrete prepared with recycled glass aggregate”, Cement and Concrete Composites Journal, vol. 31, pp. 107–113, 2009.
[7] L.M. Federico and S.E. Chidiac, “Waste glass as a supplementary cementitious material in concrete -critical review of treatment methods”, Cement & Concrete Composites, vol. 31, pp. 606–610, 2009.
[8] S.M. Palmquist, “Compressive behavior of concrete with recycled aggregates”, Doctoral dissertation, Tufts University, 2003.
[9] B. Karamanoglu, “Properties of mortar containing waste glass and limestone filler”, MS thesis, Gazimagusa, North Cyprus, 2007.
[10] B. Karamanoglu and Ö. Eren, “Properties of mortar containing waste glass and limestone filler”, 8th International Congress on advances in civil engineering, Gazimagusa, North Cyprus, pp. 171–180, 2008.
[11] N. Schwarz, H. Cam, and N. Neithalath, “Influence of a fine glass powder on the durability characteristics of concrete and its comparison to fly ash”, Cement and Concrete Composites, vol. 30, no. 6, pp. 486–496, 2008.
[12] A. Tagnit-Hamou et al., “Novel ultra-high-performance glass concrete”, Journal of ACI Concrete International, vol. 39, no. 3, pp. 53–59, 2008.
[13] A. Tagnit-Hamou, “Alternative supplementary cementitious materials for advances concrete”, International Conference on Advances in Cement and Concrete Technology in Africa, Keynote Speaker, 2016.
[14] A. Tagnit-Hamou and A. Bengougam, “The use of glass powder as supplementary cementitious material”, Concrete International, vol. 34, no. 3, pp. 56–61, 2012.
[15] A. Hussein, A. Yahia, and A. Tagnit-Hamou, “Statistical modeling of the effect of glass powder on concrete mechanical and transport properties”, ACI Materials Journal, p. 226, 2012.
[16] A. Niang, N. Roy, and A. Tagnit-Hamou, “Structural behavior of concrete incorporating glass powder used in reinforced concrete column”, Journal of Structural Engineering, Special Issue (Sustainable Building Structures B4014007), p. 141, 2012.
[17] A. Niang, N. Roy, and A. Tagnit-Hamou, “Reinforced concrete columns incorporating glass powder under concentric axial loading”, FIB Symposium, Tel-Aviv, Israel, April 2013. [18] A. Tagnit-Hamou et al., “Novel ultra-high-performance glass concrete”, Journal of ACI Concrete International, vol. 39, no. 3, pp. 53–59, 2012.
[19] M. Mageswari and B. Vidivelli, “The use of sheet glass powder as fine aggregate replacement in concrete”, The Open Civil Engineering Journal, vol. 4, pp. 65–71, 2012.
[20] A. Sharma and A. Sangamnerkar, “Glass powder – A partial replacement for cement”, International Journal of Core Engineering and Management (IJCEM), Acropolis Institute of Technology and Research, Indore (MP), India, vol. 1, 2015.
[21] R. Sakale, S. Jain, and S. Singh, “Experimental investigation on strength of glass powder replacement by cement in concrete with different dosages”, International Journal of Advanced Research in Computer Science and Software Engineering, vol. 5, no. 12, pp. 386–390, 2015.
[22] S.M. Hama and M.T. Nawar, “Beneficial role of glass wastes in concrete – a review”, Journal of Engineering and Sustainable Development, vol. 22 (02 Part-5), pp.136–144, 2018. [23] A.A. Aliabdo, M. Abd Elmoaty, and A.Y. Aboshama, “Utilization of waste glass powder in the production of cement and concrete”, Construction and Building Materials, vol. 124, pp. 866–877, 2016.
[24] J.M. Ortega et al., “Influence of waste glass powder addition on the pore structure and service properties of cement mortars”, Sustainability, vol. 10, no. 3, p. 842, 2018.
[25] A. Omran and A. Tagnit-Hamou, “Performance of glass-powder concrete in field applications”, Construction and Building Materials, vol. 109, pp. 84–95, 2016.

Go to article

Authors and Affiliations

Salam Salman Chiad Alharishawi
1
ORCID: ORCID
Nagham Rajaa
2
ORCID: ORCID
Aqeel Raheem Jabur
3
ORCID: ORCID

  1. Mustansiriyah University, College of Engineering, Environmental Engineering Department, Baghdad, Iraq
  2. Mustansiriyah University, College of Engineering, Highway and Transportation Engineering Department, Baghdad, Iraq
  3. Mustansiriyah University, College of Engineering, Civil Engineering Department, Baghdad, Iraq

This page uses 'cookies'. Learn more