| 退火42CrMo钢的棘轮-疲劳交互作用及其失效模型 |
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| 引用本文： | 刘宇杰,康国政,高庆,李钊.退火42CrMo钢的棘轮-疲劳交互作用及其失效模型[J].工程力学,2008,25(11). |
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| 作者姓名： | 刘宇杰 康国政 高庆 李钊 |
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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，国家重点基础研究发展计划(973计划)，西南交通大学校科研和教改项目 |
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| 摘 要： | 在室温下,对退火42CrMo钢的单轴棘轮行为以及棘轮-疲劳交互作用进行了系统的实验研究。结果表明:非对称应力循环下产生的棘轮变形会缩短材料的疲劳寿命,材料在非对称应力循环下的低周疲劳寿命受到平均应力、应力幅值、最大应力和应力比等多种因素的影响。在对实验结果分析与讨论基础上,针对棘轮-疲劳交互作用,提出了一个基于最大应力和应力比的、简单而合理的疲劳失效寿命估算公式。该模型考虑了棘轮变形对疲劳寿命的影响。与实验结果的对比表明:该公式能较好的估算各种非对称应力循环下的低周疲劳寿命,所有计算结果均在2倍分散带内。
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| 关 键 词： | 退火42CrMo钢 棘轮行为 低周疲劳 应力循环 失效模型 |
RATCHETING-FATIGUE INTERACTION OF ANNEALED 42CrMo STEEL AND ITS FAILURE MODEL |
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| LIU Yu-jie,KANG Guo-zheng,GAO Qing,LI Zhao.RATCHETING-FATIGUE INTERACTION OF ANNEALED 42CrMo STEEL AND ITS FAILURE MODEL[J].Engineering Mechanics,2008,25(11). |
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| Authors: | LIU Yu-jie KANG Guo-zheng GAO Qing LI Zhao |
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| Affiliation: | Department of Applied Mechanics and Engineering;Southwest Jiaotong University;Chengdu 610031;China |
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| Abstract: | The uniaxial ratcheting behavior and the ratcheting-fatigue interaction of annealed 42CrMo steel were studied by tests at room temperature. The ratcheting and low-cycle fatigue (LCF) properties of the material were investigated in uniaxial cyclic stressing. It is shown that the ratcheting deformation produced in asymmetrical cyclic stressing decreases the fatigue life of the material, and that the LCF life of the material depends on the applied mean stress, stress amplitude, maximum stress and stress ratio.... |
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| Keywords: | annealed 42CrMo steel ratcheting low cycle fatigue cyclic stressing failure model |
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