中国机械工程Issue(18)：2506-2510,2517,6.DOI:10.3969/j.issn.1004132X.2015.18.017
一种基于连续损伤力学的低周疲劳寿命预测模型
A Life Prediction Model for Low Cycle Fatigue Based on Continuum Damage Mechanics
摘要
Abstract
According to the basic conservation law of continuous media and continuum damage me-chanics,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 es-tablished.Through low cycle fatigue experiments with smooth specimens of 31 6L 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 agree-ment with the experimental ones.关键词
低周疲劳/损伤/平均应变/疲劳寿命/316L钢Key words
low cycle fatigue/damage/mean strain/fatigue life/31 6L steel分类
数理科学引用本文复制引用
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,(18):2506-2510,2517,6.基金项目
国家自然科学基金资助项目(51375516) （51375516）
重庆市应用技术开发重点资助项目(cstc2014yykfB90002) （cstc2014yykfB90002）
重庆工商大学科研启动经费资助项目(2014-56-10) （2014-56-10）
教育部平台科技资助项目(fykf201502) （fykf201502）
