The strain amplitude controlled fatigue behavior of pure copper with ultra large grain size

Huang, Hsuan‐Jung; Mao, Shih-Wei; Gan, Dershin; Ho, New-Jin

doi:10.1016/j.msea.2012.08.067

Cited by 6 publications

(4 citation statements)

References 39 publications

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“…Zhang and Jiang 74 have reported that oxygen‐free high conductivity (OFHC) polycrystalline copper displays cyclic hardening behavior when subjected to strain‐controlled cycling. The cyclic‐hardening feature of OFHC copper have been discussed by Lamba and Sidebottom, 77 Khan and Jackson, 78 Huang et al, 79 Hsu and Wang, 80 and Marnier et al 81 also, but for either predominantly for strain‐controlled, or for stress‐controlled conditions. The reported strain‐controlled stabilized hysteresis loops with a strain amplitude of 1% for OFHC copper 74 as shown in Figure 6A is considered here to obtain the preliminary estimates for the CIKH model parameters by following the adopted methodology.…”

Section: Resultsmentioning

confidence: 98%

Estimation of cyclic hardening/softening and ratcheting response of materials through an algorithm to optimize parameters in Chaboche's hardening rule

Nath

Barai

Ray

2022

Fatigue Fract Eng Mat Struct

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A methodology considering Chaboche's isotropic-kinematic hardening (CIKH) model and genetic algorithm optimization technique is examined here to simulate the cyclic-plastic response for materials exhibiting cyclic hardening or softening behavior. The aim of the present report is to illustrate the inherent potential of this approach by assessing the closeness of fit of the obtained predictions to the experimental results for several materials like Z2CND18.12N, and 25CDV4.11 steels, OFHC copper, and INCONEL718 alloy. The obtained results were further subjected to comparative examinations with the available predictions to demonstrate the adoptability of the suggested methodology for the cyclic hardening or softening materials. This proposed approach provides a single set of CIKH model parameters to replicate the stabilized hysteresis loops and cyclic hardening or softening behavior under symmetric strain-controlled loading, as well as ratcheting characteristics under asymmetric stresscontrolled cycling, and is thus generalized in nature.

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Section: Resultsmentioning

confidence: 98%

Estimation of cyclic hardening/softening and ratcheting response of materials through an algorithm to optimize parameters in Chaboche's hardening rule

Nath

Barai

Ray

2022

Fatigue Fract Eng Mat Struct

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“…For example, Huh et al observed the fracture surface of copper lm by electron microscope and found that the fracture of copper lm was transgranular under cyclic load [7]. Similar research works of copper have also been carried out by other authors [8,9]. Liu et al found that the stress concentration existed at the end of the dropper, which is the main reason for the fatigue damage of dropper [10].…”

Section: Introductionmentioning

confidence: 81%

Analysis of Dropper Stress in a Catenary System for a High-Speed Railway

Chen

Sun

Pan

et al. 2022

Mathematical Problems in Engineering

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When the pantograph slides over the contact wire at a high speed, there are cyclic stresses acting on droppers. The cyclic stresses are related with the fatigue life and fracture of the dropper. Thus, the stress calculation of the dropper is particularly important to ensure the safe operation of a train. In this paper, a simple model based on a span of five droppers is constructed. The contact wire is treated as a beam element and the vibration equation under a dynamic force is deduced. Then, the stresses are performed numerically using the finite difference method. The stress-time relationship under a dynamic force is obtained and compared with that under a constant force. The results show that there is a large shock effect during the deformation of dropper from straightening to compression and then bending. The dynamic force could cause much higher stresses than a constant force. It indicates that a dynamic force has a more significant impact on the stress value of dropper than a constant force.

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“…They have investigated the relationship between the S-N curve and microstructure. 8 Nasution et al 9 followed the fatigue characteristics of the flexible copper stranded wire. These studies expressed a significant influence on the materials microstructure on its fatigue strength.…”

Section: Fatigue Life Analysismentioning

confidence: 99%

Fatigue life analysis of dropper used in pantograph-catenary system of high-speed railway

Chen

Peng

2018

Advances in Mechanical Engineering

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Dropper is an important component of pantograph-catenary system employed in high-speed railway. The cyclic stress in dropper can lead to the fatigue failure during operation. The study of the fatigue life of dropper is the premise to ensure the safe exploitation of the train. The analytic vibration equation of dropper is proposed. Based on the finite difference method and MATLAB numerical calculation program, the vibration process and stress variation of the dropper are simulated. The influence of excitation frequency, vibration amplitude, and applied force on fatigue life of dropper is studied, according to the stress history of the dropper, the Basquin equation, and the Palmgren-Miner linear fatigue cumulative damage criterion. The numerical results show that the logarithm of the fatigue life of dropper shows a linear decreasing trend with the increase in the excitation frequency, vibration amplitude, or applied force.

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The strain amplitude controlled fatigue behavior of pure copper with ultra large grain size

Cited by 6 publications

References 39 publications

Estimation of cyclic hardening/softening and ratcheting response of materials through an algorithm to optimize parameters in Chaboche's hardening rule

Estimation of cyclic hardening/softening and ratcheting response of materials through an algorithm to optimize parameters in Chaboche's hardening rule

Analysis of Dropper Stress in a Catenary System for a High-Speed Railway

Fatigue life analysis of dropper used in pantograph-catenary system of high-speed railway

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