复合型弹塑性断裂J积分参量的研究  

STUDY ON J INTEGRAL OF ELASTIC PLASTIC FRACTURE UNDER MIXED MODE LOADING

作　　者：沙江波[1,2] 孙军[1,2] 邓增杰 周惠久[1,2] 

机构地区：[1]广东工学院材料科学与工程系 [2]西安交通大学材料科学与工程学院

出　　处：《机械强度》1997年第2期68-72,共5页Journal of Mechanical Strength

基　　金：博士点基金

摘　　要：从Ｊ积分定义出发，应用数学分析方法给出裂纹体受任意一空间载荷作用时的复合型Ｊ积分ＪＭ与各类载荷分量单独作用时的Ｊ积分之间的关系式。各载荷下的Ｊ积分均具有守恒性。用有限元方法对一种材料、两种结构的试样在复合型载荷作用下Ｊ积分的守恒性进行了分析和验证，对Ｊ积分概念在复合型弹塑性断裂分析中的应用及复合型Ｊ判据的建立进行了讨论。For a crack acted a arbitrary space loading,the relationship between mixed mode J integral and J integrals supplied singly by different loading components was proposed by mathematic analysis.It is shown that: J M=J ⅠⅠ +J ⅡⅡ +J ⅢⅢ ,for Ⅰ+Ⅱ+Ⅲ mixed loading,where J ⅠⅠ ,J ⅡⅡ and J ⅢⅢ are the J integrals of mode Ⅰ,mode Ⅱ and mode Ⅲ loading components,respectively,and each J integral is path independent.The behavior of path independent of each J integral was analysed and proved by finite element method for two kinds of specimens.The usage of J integral concept to analyse the mixed mode elastic plastic fracture and the establishment of J criteria were discussed.

关 键 词：弹塑性断裂 复合型 有限元 J积分 断裂力学 

分 类 号：O346.1[理学—固体力学]