疲劳裂纹扩展规律Paris公式的一般修正及应用.pdf

疲劳裂纹扩展规律Paris 公式的一般修正及应用 , , ( , 230026) : 介绍了疲劳裂纹扩展规律Paris 公式及其与传统应力疲劳S- N 曲线的关系, 分析了计算疲 劳裂纹扩展寿命的 般过程阐述了当前Paris 公式在工程中的 般修正, 具体描述了不同的修正 形式及其主要特征, 简要介绍了Paris 公式在弹塑性断裂力学和连续损伤力学中的修正及应用各 种应用实践表明, 对于不同要求的工程问题要采用相应的修正形式 : 疲劳裂纹; 扩展速率; Paris 公式 :TQ05012 : A : 1001- 4837( 2006) 12- 0008- 08 General Modification and Application of the Paris Law for Fatigue Crack Propagation NI Xiang- gui, LI Xin- liang, WANG Xiu- xi ( CAS Key Labora ory of Mechanical Behavior and Design of Ma erials , Universi y of Science & Technology of China, Hefei 230026, China) A stract:The paper has reviewed he Paris law for fa igue crack propaga ion, he rela ionship be ween he Paris equa ion and he radi ional s ress fa igue S- N curve of ma erial, and he common process of calcula ing he life ime for fa igue crack propaga ion. The general modifica ion and applica ion of he Paris law in engineering is discussed , and he differen forms and charac eris ics of modif ica ion are analyzed and explica ed .The modifica- ion and applica ion in he elas oplas ic frac ure mechanics and he con inuum damage mechanics is briefly in- roduced . I has been shown ha , he appropria e modifica ion forms should be adop ed for differen problems in engineering. Key words:fa igue crack; propaga ion ra e; he Paris law 0 , , - , ( Ñ) , ( Ò) ( Ó) ( Ñ) 1963 Paris Erdogan , , Paris [ 1] [ 2] , # 8 # 23 12