摘要
针对工程中疲劳裂纹扩展过程带有很大的随机性,采用Paris-Erdogan公式计算了两端承受均布拉伸载荷的边缘斜裂纹板的疲劳裂纹扩展寿命。裂纹扩展方向采用最大周向应力准则。在此基础上,以材料属性和载荷为随机变量,用随机有限元法结合计算可靠度的四阶矩法,分析了分布参数为任意分布时的疲劳裂纹扩展寿命可靠度对极限寿命的变化规律。通过算例说明本文方法的结果与Monte-Carlo Simulation的结果误差很小,对疲劳设计有一定的指导意义。
Based on Paris-Endogan formula, fatigue crack propagation life of a plate with a slope crack along left edge and subjected to constant distributed stress at up/down edges of the plate is analyzed. The direction of the crack propagation follows the maximum circumferential stress criterion. Based on the former research, considering material properties and loads as random parameters, the variable reliability of fatigue crack propagation life to the limit life is evaluated by Stochastic Finite Element Method Combining with Fourth Moment Method.
出处
《应用力学学报》
CAS
CSCD
北大核心
2009年第3期604-607,共4页
Chinese Journal of Applied Mechanics
基金
国家863目标导向类项目(2007AA04Z442)
国家自然科学基金重点资助项目(50875039)
关键词
疲劳寿命
任意分布参数
四阶矩法
可靠性
fatigue life, arbitrary distributed parameters, fourth moment method, reliability.
