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Fatigue Life Predicting for Nitrided Steel – Finite Element Analysis

J. Sawicki P. Siedlaczek A. Staszczyk
Archives of Metallurgy and Materials | 2018 | vol. 63 | No 2 | DOI: 10.24425/122423
Keywords numerical simulation nitriding fatigue life fatigue analysis finite element
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Abstract

Thermo-chemical treatments are known to increase the fatigue life of industrial parts. Due to the imprecise consideration of residual stresses in predicting the durability of components subjected to cyclic loading and their effect on the fatigue life, the authors developed a numerical model combining the influence of residual stresses with stresses caused by bending. The authors performed the numerical simulation with the use of Finite Element Method to analyse material behaviour during cyclic loading. The residual stress state developed during nitriding was introduced onto cross-section of the numerical specimen. The goal of this work was better understanding of the real conditions of the nitride steel fatigue processes and improving the knowledge about numerical predicting of the fatigue life for parts with residual stresses. The results of simulation were compared with plane bending fatigue tests. The presented method indicates the possibility of increasing the accuracy of the fatigue analysis of elements after surface treatment, increasing its certainty and the ability to perform better optimization of service life.
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Authors and Affiliations

J. Sawicki
P. Siedlaczek
A. Staszczyk

The influence of higher modes vibrations on local cracks in node of lattice girders bridges

S. Pradelok
Archives of Civil Engineering | 2012 | No 2 | 209-221
Keywords bridge vibrations cracking detailed models dynamic analysis fatigue analysis
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Abstract

Several previous investigations on failure of a certain type lattice girders railway bridge (on so called BJD line) have not convincingly explained reasons nor have they described potential hazards. This paper attempts to provide an answer, employing static, dynamic, and fatigue analysis of the structure, focusing on previously not analyzed vibrations of elements constituting a lattice node. Detailed models of two types of such nodes – damaged and non- damaged were compared, inside carefully defined limits of applicability.

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Authors and Affiliations

S. Pradelok

Assessment of Durability of the Toothed Segment Based on FEM Analysis and Low Fatigue Cycle Test

M. Maj S. Pysz R. Żuczek J. Piekło
Archives of Foundry Engineering | 2016 | No 4 | DOI: 10.1515/afe-2016-0094
Keywords Design life cycle fatigue analysis Fatigue criteria Low Fatigue Cycle test
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Abstract

The development of a novel design for the toothed segment of drive transmission in longwall shearer is expected to significantly reduce

the cost of individual components of the feed system and the related work of repair and renovations, increasing at the same time the safety

of mine repair teams.

The conducted experimental and numerical analysis of the state of stress and strain in the innovative design of the toothed segment has

enabled estimating the maximum effort of the developed structure. Based on the results of fundamental mechanical studies of the cast

L20HGSNM steel and fatigue tests combined with the numerical stress/strain analysis, the fatigue life curve was plotted for the examined

casting of the rack.

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Authors and Affiliations

M. Maj
S. Pysz
R. Żuczek
J. Piekło

Optimization of process parameters of friction stir welded AA5082-AA7075 butt joints using resonance fatigue properties

Gaurav Kumar Rajeev Kumar Ratnesh Kumar
Bulletin of the Polish Academy of Sciences Technical Sciences | 2020 | 68 | No. 1 | 99-108 | DOI: 10.24425/bpasts.2020.131830
Keywords friction stir welding Dissimilar Al Welding Resonance Fatigue Analysis Fracture Surface Analysis ANOVA
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Abstract

In this work, experiments were carried out to quantify the behaviour of friction stir welded (FSW) AA5082-AA7075 butt joints under tensile loading and completely reversed fatigue loading. Different samples were prepared to identify optimum tool rotational and travel speeds to produce FSW AA5082-AA7075 butt joints with the maximum fatigue life. ANOVA was performed, which confirmed that both tool speed and tool rotational speed affect the tensile strength of the weld. The samples exhibit a considerable difference in their fatigue life and tensile strength. This difference can be accounted to the presence of welding defects such as surface defects and porosity. S-N curve plotted for the sample shows a significantly high fatigue life at the lower stress ranges. Fracture surfaces were also analysed under scanning electron microscope (SEM). Study of the fracture surface of the sample that failed under fatigue loading showed that the surface was mainly divided in two zones. The first zone was the area of fatigue crack growth where each stress cycle, slowly and gradually, helped in the growth of the crack. The second zone was the region of fast fracture where the crack growth resulted in the failure of the joint instantaneously. The fracture surface study of the sample that failed under tensile loading showed that the mode of failure was ductile in nature.

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Authors and Affiliations

Gaurav Kumar
Rajeev Kumar
Ratnesh Kumar

Design and analysis of cementless hip-joint system using functionally graded material

Saeed Asiri
Archive of Mechanical Engineering | 2022 | vol. 69 | No 1 | 129-146 | DOI: 10.24425/ame.2021.139804
Keywords functionally graded material cementless hip-joint system natural frequency harmonic response fatigue analysis finite element analysis modal analysis
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Abstract

Functionally Graded Materials (FGM) are extensively employed for hip plant component material due to their certain properties in a specific design to achieve the requirements of the hip-joint system. Nevertheless, if there are similar properties, it doesn’t necessarily indicate that the knee plant is efficiently and effectively working. Therefore, it is important to develop an ideal design of functionally graded material femoral components that can be used for a long period. A new ideal design of femoral prosthesis can be introduced using functionally graded fiber polymer (FGFP) which will reduce the stress shielding and the corresponding stresses present over the interface. Herein, modal analysis of the complete hip plant part is carried out, which is the main factor and to date, very few research studies have been found on it. Moreover, this enhances the life of hip replacement, and the modal, harmonic, and fatigue analysis determines the pre-loading failure phenomena due to the vibrational response of the hip. This study deals with the cementless hip plant applying the finite element analysis (FEA) model in which geometry is studied, and the femoral bone model is based in a 3D scan.
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Authors and Affiliations

Saeed Asiri
1
ORCID: ORCID
  1. Mechanical Engineering Department, Engineering College King Abdulaziz University, Jeddah, Saudi Arabia

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