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缺口件疲劳寿命分布预测的有效应力法
引用本文:奚蔚,姚卫星.缺口件疲劳寿命分布预测的有效应力法[J].固体力学学报,2013,34(2):205-212.
作者姓名:奚蔚  姚卫星
作者单位:1. 南京航空航天大学飞行器先进设计技术国防重点学科实验室;2. 南京航空航天大学;
基金项目:国家自然科学基金项目,教育部长江学者创新团队项目
摘    要:本文提出了一种由光滑件疲劳寿命试验数据预测缺口件疲劳寿命分布的有效应力法。该方法中缺口件的裂纹可能萌生表面被分解成一个个微元,整个表面可看成是这些微元组成的一个串联模型,按照串联概率失效模型,缺口件的疲劳强度失效概率就可以由各微元的疲劳强度失效概率计算得到,其中微元的疲劳强度失效概率是由光滑件的疲劳强度失效概率通过最弱环节理论计算得到的。在缺口件的疲劳强度失效概率表达式中,引入了有效应力的概念,用它查取光滑件的疲劳寿命试验数据就可以直接得到缺口件的疲劳寿命分布。该方法可以同时考虑到应力梯度和试件尺寸对缺口件疲劳寿命分布的影响。进行了材料LY12CZ的带中心孔缺口件的寿命算例分析,预测结果和试验结果吻合良好,表明该方法是有效的。

关 键 词:缺口件  疲劳寿命分布  有效应力  最弱环节理论  尺寸效应  场强法  notched  specimen  fatigue  life  distribution  effective  stress  weakest-link  theory  size  effect  stress  field  intensity  
收稿时间:2011-11-09

EFFECTIVE STRESS MODEL FOR FATIGUE LIFE DISTRIBUTION OF NOTCHED SPECIMEN
Wei Xi , Weixing Yao.EFFECTIVE STRESS MODEL FOR FATIGUE LIFE DISTRIBUTION OF NOTCHED SPECIMEN[J].Acta Mechnica Solida Sinica,2013,34(2):205-212.
Authors:Wei Xi  Weixing Yao
Abstract:The effective stress model for predicting the fatigue life distribution of notched specimens from fatigue life test data of smooth specimens is developed in this paper. In this model, the possible crack initiation surface of the notched specimen is separated into many elements and the surface is considered as a series model of these elements. Thus, according to the series failure model, the fatigue strength failure probability of the notched specimen can be calculated from that of the elements, which can be determined from the fatigue strength failure probability of the smooth specimen by using the weakest-link theory. In the formula of the notched specimen fatigue strength failure probability, the parameter of effective stress is introduced. Employing this parameter to refer to the fatigue life test data of smooth specimens would lead to the fatigue life distribution of notched specimens. This model reflects the influence of both stress gradient and component size on the notched specimen fatigue life distribution. An example of centre hole notched LY12CZ specimens was accomplished. The predicted result is in good agreement with the test result, which shows that this method is effective and practical.
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