A  Life Prediction  Model  for  Low  Cycle  Fatigue  Based  on Continuum  Damage  Mechanics

China Mechanical Engineering ›› 2015, Vol. 26 ›› Issue (18): 2506-2510,2517.

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A Life Prediction Model for Low Cycle Fatigue Based on Continuum Damage Mechanics

Chen Ling;Zhang Xianming;Ouyang Ping

Engineering Research Center for Waste Oil Recovery Technology and Equipment,Chongqing Technology and Business University, Chongqing,400067

Online:2015-09-25 Published:2015-09-23
Supported by:
National Natural Science Foundation of China（No. 51375516）

一种基于连续损伤力学的低周疲劳寿命预测模型

陈凌;张贤明;欧阳平

重庆工商大学废油资源化技术与装备工程研究中心,重庆,400067

基金资助:
国家自然科学基金资助项目(51375516);重庆市应用技术开发重点资助项目(cstc2014yykfB90002);重庆工商大学科研启动经费资助项目(2014-56-10);教育部平台科技资助项目(fykf201502)

Abstract

Abstract:

According to the basic conservation law of continuous media and continuum damage mechanics,the decrease of effective bearing area caused by the material fatigue damage could be expressed as a function of mean strain.The low cycle fatigue damage evolution of the micro crack stage and the fatigue crack stage were analyzed.And then,a model for the life prediction of low cycle fatigue was established.Through low cycle fatigue experiments with smooth specimens of 316L steel at 420℃ under stress control, the damage evolution were described and the fatigue life prediction was carried out by the method mentioned above.Results show that the micro crack stage is the main stage of low cycle fatigue life consumption of material.And compared with the experimental data, it is found that the predicted results which are obtained by the sampling data of different life periods are in good agreement with the experimental ones.

Key words: low , cycle fatigue;damage, mean strain;fatigue life;316L steel

摘要：

基于连续介质基本守恒定律和连续损伤力学,可将材料疲劳损伤造成的有效承载面积减小表示为平均应变的函数，在此基础上，按微裂纹阶段和疲劳裂纹阶段对材料低周疲劳的损伤演化进行了分析，并建立了一种低周疲劳寿命预测模型。对316L钢光滑试样进行420℃环境下应力控制的低周疲劳试验，采用上述方法进行损伤描述和寿命预测。结果表明微裂纹阶段是材料低周疲劳寿命消耗的主要阶段，采用各寿命段采样数据获得的寿命预测结果与试验结果较
符合。

关键词: 低周疲劳；损伤；平均应变；疲劳寿命, 316L钢

CLC Number:

Chen Ling, Zhang Xianming, Ouyang Ping. A Life Prediction Model for Low Cycle Fatigue Based on Continuum Damage Mechanics[J]. China Mechanical Engineering, 2015, 26(18): 2506-2510,2517.

陈凌, 张贤明, 欧阳平. 一种基于连续损伤力学的低周疲劳寿命预测模型[J]. 中国机械工程, 2015, 26(18): 2506-2510,2517.

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A Life Prediction Model for Low Cycle Fatigue Based on Continuum Damage Mechanics

一种基于连续损伤力学的低周疲劳寿命预测模型

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