复合型裂纹扩展的主应力因子模型及Ⅰ-Ⅲ复合型裂纹扩展  

Mixed crack propagation principal stress factor model and Ⅰ-Ⅲ mode crack propagation

作　　者：田常海[1] 

机构地区：[1]铁道部科学研究院金化所,北京100081

出　　处：《应用力学学报》2004年第1期84-89,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然基金 ( 5 0 2 710 48);铁道部科技发展计划项目 ( 2 0 0 2G0 19)的资助

摘　　要：以垂直于裂纹扩展径向平面上的主应力σ1及极径r的组合量 2πrσ1作为主应力因子 σ1,提出了主应力因子下的复合型裂纹扩展的断裂准则及静态断裂模型 ,在此基础上 ,推导了考虑裂纹闭合的扩展速率公式 ,进行了Ⅰ Ⅲ复合型裂纹扩展试验 ,并对断口作了扫描电镜观察分析 ,试验表明The principal stress σ 1, normal to crack propagation plane, and the polar radium r are used to define a principal stress factor 1=2πrσ 1 in this paper. A crack propagation fracture criterion and a static fracture model are proposed based on the principal stress factor for mixed type crack problems. Crack propagation rate equation is deduced taking into account crack close effect. Ⅰ-Ⅲ mode crack propagation tests are carried out and fracture outline is observed by SEM. The results of the tests show that the crack propagation model is suitable.

关 键 词：复合型裂纹 Ⅰ-Ⅲ复合型裂纹 裂纹扩展 主应力因子 扫描电镜分析 断裂准则 

分 类 号：O346.1[理学—固体力学] TG115.21[理学—力学]