四川轻化工大学学报（自然科学版）2024，Vol.37Issue(2)：31-38,8.DOI:10.11863/j.suse.2024.02.05
U75V钢轨钢耦合损伤循环塑性本构模型研究
Study on Damage-coupled Cyclic Plastic Constitutive Model of U75V Rail Steel
摘要
Abstract
In order to address the whole-life ratcheting behavior of U75V rail steel for heavy-haul railways and subways in China,the damage-coupled cyclic plastic constitutive model of U75V rail steel is investigated in this paper.Firstly,the whole-life ratcheting behavior of U75V rail steel at room temperature is studied through cyclic experiments with different average stresses and different stress amplitudes;subsequently,a damage-coupled cyclic plastic constitutive model is proposed in the framework of damage mechanics and cyclic plasticity.The proposed model incorporates the damaged-coupled Chaboche kinematic hardening model and exponential damage evolution law.Finally,based on the observed failure modes of the material in the experiments,the critical value of the damage variable is adopted as the fatigue failure criterion for predicting the failure life.Results demonstrate that when the cycle is stable,the simulated ratcheting strain rate error is below 22.0%,while it reaches 38.0%during cycle failures.The predicted fatigue life of U75V rail steel falls within the 1.5 times error band.Overall,the developed damage-coupled cyclic plastic constitutive model effectively describes the whole-life ratcheting behavior of U75V rail steel subjected to cyclic asymmetric uniaxial stress loadings.关键词
U75V钢轨钢/棘轮行为/低周疲劳/本构模型/耦合损伤Key words
U75V rail steel/ratcheting behavior/low cycle fatigue/constitutive model/damage-coupled分类
数理科学引用本文复制引用
张金,刘宇轩,李建,阚前华..U75V钢轨钢耦合损伤循环塑性本构模型研究[J].四川轻化工大学学报（自然科学版）,2024,37(2):31-38,8.基金项目
国家自然科学基金青年项目(12102411) （12102411）
四川省科技厅项目(2022NSFSC1957) （2022NSFSC1957）
