转轴裂纹扩展的可靠性分析  

RELIABILITY ANALYSIS FOR CRACK PROPAGATION OF

作　　者：苏长青[1] 张义民[2] 杜劲松[1] 赵群超[2] 

机构地区：[1]中国科学院沈阳自动化研究所自动化系统研究室,沈阳110016 [2]东北大学机械工程与自动化学院,沈阳110004

出　　处：《机械强度》2010年第1期74-78,共5页Journal of Mechanical Strength

基　　金：国家高科技研究发展计划（2007AA04Z442）、国家自然科学基金（50535010）资助项目.

摘　　要：在Paris-Erdogan裂纹扩展模型的基础上，考虑裂纹扩展模型的随机参数影响，采用裂纹长度失效准则建立旋转机械转轴裂纹扩展的可靠性模型，应用随机摄动理论和Kronecker代数导出状态函数的前四阶矩，应用应力-强度干涉理论和四阶矩技术，确定转轴裂纹扩展的可靠度，并通过数值算例表明文中方法的有效性和实用性。On the basis of the Paris-Erdogan crack propagation model, the effect of random parameters on the crack propagation model is considered, the reliability model for crack propagation of rotating shaft in rotating machinery is presented based on the crack length failure criteria. The first four moments of state function are determined by applying the random perturbation theory and the Kronecker algebra. The reliability of crack propagation is obtained by using the stress-strength interference theory and the fourth moment method. Results from numerical example prove the proposed method is effective and practical.

关 键 词：转轴 裂纹扩展 随机摄动 可靠性分析 

分 类 号：O346.1[理学—固体力学] TB114.3[理学—力学]