基于临界平面法的缺口件疲劳寿命预测方法  

The Fatigue Life Prediction Method of Notched Specimen Based on the Critical Plane

作　　者：张莉[1] 程靳[1] 李新刚[1] 

机构地区：[1]哈尔滨工业大学航天科学与力学系,哈尔滨150001

出　　处：《宇航学报》2007年第4期824-826,869,共4页Journal of Astronautics

摘　　要：利用弹塑性有限元分析得到缺口件的应力、应变历史,分别计算任意材料平面上的描述拉伸和剪切疲劳破坏的两种损伤参量,取最大损伤参量所在的平面为临界平面,并利用最大损伤参量预测拉伸和剪切疲劳寿命,取小值为缺口件的疲劳寿命,进而得到一种预测缺口件疲劳寿命的预测方法。用此方法预测了SAE1045钢缺口件的疲劳寿命,并与实验值进行比较,误差分布在2-3倍因子范围之内。The critical plane approach is applied to prediction fatigue life of notched specimen. Stress and strain of notched specimen can be accounted using elastic-plastic finite element method. Two kinds of damage parameters to describe tensile-mode cracking and shear-mode cracking on arbitrary plane are calculated. The largest damage parameters are determined, and using these damage parameters the fatigue lives of tensile-mode cracking and shear-mode cracking are predicted. Smaller of both is regarded as fatigue lives. So a fatigue life prediction method of notched specimen is obtained. Based on it the fatigue life of SAE1045 steel notched specimen are predicted and compared with the test results, the agreement is found to be good indeed.

关 键 词：缺口件 临界平面法 疲劳寿命预测 损伤参量 

分 类 号：O346.2[理学—固体力学]