| 调质42CrMo钢的棘轮-疲劳交互作用及其耦合损伤粘塑性本构模型 |
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| 引用本文： | 刘宇杰,康国政,高庆,丁俊.调质42CrMo钢的棘轮-疲劳交互作用及其耦合损伤粘塑性本构模型[J].固体力学学报,2009,30(2). |
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| 作者姓名： | 刘宇杰 康国政 高庆 丁俊 |
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| 作者单位： | 西南交通大学应用力学与工程系,成都,610031 |
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| 基金项目： | 国家自然科学基金，西南交通大学博士研究生创新基金 |
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| 摘 要： | 对调质42CrMo钢的棘轮-疲劳交互作用的实验结果进行了分析,揭示了材料在非对称应力循环下的全寿命棘轮变形特征和低周疲劳损伤演化特性.在统一粘塑性循环本构模型框架下,基于连续损伤力学理论,提出一个耦合损伤的牯塑性本构模型.该模型中将损伤分为宏观弹性损伤和塑性损伤两部分,并采用不同的损伤演化方程来描述这两类损伤.针对材料不同的失效模式,分别采用损伤变量门槛值和最大应变作为失效判据.将模型应用于调质42CrMo钢单轴应力循环下全寿命棘轮行为的描述和低周疲劳寿命预测中,模拟结果和实验结果吻合较好.
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| 关 键 词： | 棘轮行为 低周疲劳 本构模型 损伤 调质42crMo钢 |
RATCHETING-FATIGUE INTERACTION OF TEMPERED 42CrMo STEEL AND ITS DAMAGE-COUPLED VISOCO-PLASTIC CONSTITUTIVE MODEL |
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| Yujie Liu,Guozheng Kang,Qing Gao,Jun Ding.RATCHETING-FATIGUE INTERACTION OF TEMPERED 42CrMo STEEL AND ITS DAMAGE-COUPLED VISOCO-PLASTIC CONSTITUTIVE MODEL[J].Acta Mechnica Solida Sinica,2009,30(2). |
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| Authors: | Yujie Liu Guozheng Kang Qing Gao Jun Ding |
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| Institution: | Department of Applied Mechanics and Engineering;Southwest Jiaotong University;Chengdu;610031 |
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| Abstract: | Based on the experimental results of ratcheting-fatigue interaction for tempered 42CrMo steel,the whole-life ratcheting deformation features and the low-cycle fatigue(LCF) damage evolution characteristics of the material were first discussed.Then,in the frame work of unified visoco-plasticity and continuum damage mechanics,a damage-coupled visoco-plastic cyclic constitutive model was proposed to describe the ratcheting-fatigue interaction of the material.In the proposed model,the damage was divided into two... |
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| Keywords: | ratcheting low cycle fatigue constitutive model damage tempered 42CrMo steel |
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