双轴载荷下含埋藏及扩展裂纹平板的极限载荷及J积分分析  

ANALYSIS ON LIMIT LOAD AND J-INTEGRAL FOR EMBEDDED AND PROPAGATED CRACK PLATES UNDER BIAXIAL LOADING

作　　者：吕原君[1,2] 陈琼 张迅雷[3] LV YuanJun;CHEN Qiong;ZHANG XunLei(Electrical and Electronic Engineering Institute,Zhejiang Industry Polytechnic College,Shaoxing 312000,China;School of Civil and Environmental Engineering,Ningbo University Ningbo 315211,China;Zhejiang XCC Group Co.,Ltd.,Shaoxing 312500,China)

机构地区：[1]浙江工业职业技术学院电气电子工程学院,绍兴312000 [2]宁波大学土木与环境工程学院,宁波315211 [3]浙江五洲新春集团股份有限公司,绍兴312500

出　　处：《机械强度》2020年第5期1214-1222,共9页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(41427802,51575489);浙江省教育厅科研项目(Y201941498);浙江工业大学开放基金项目(EM2017120102)资助。

摘　　要：含埋藏椭圆裂纹平板在双轴载荷作用下会发生韧带断裂,埋藏裂纹会扩展为表面裂纹,表面裂纹会进一步扩展为贯穿裂纹,含不同裂纹类型构件在双轴加载工况时的机械强度目前成为研究焦点。以一种典型双轴加载条件(在平板端面施加垂直于裂纹面方向的拉/压力及沿厚度方向的弯矩和在沿厚度方向的平板两侧面施加拉/压应力)为载荷工况,以含埋藏椭圆裂纹平板为研究对象,开展对含埋藏椭圆裂纹及扩展后的表面椭圆裂纹、沿厚度方向穿透裂纹或沿宽度方向贯穿表面裂纹平板的极限载荷值及J积分值对比分析,给出了FAD评定图及评定方案,为用户合理使用含缺陷构件提供参考。Ligament rupture occurs for embedded crack plate under biaxial loading.Then,embedded crack will propagate as surface crack,through-thickness cracks or extended surface cracks.The mechanical strength of components with different types of cracks under biaxial loading has become the focus of research.As a typical biaxial loading condition,an end tensile/compressive force applied at the centroids of the end sections of the plate perpendicular to the crack plane,a tensile/compressive stress parallel to the crack plane and a cross-thickness bending moment applied at the end sections of the plate,has been considered.Taking a plate with embedded elliptical crack is as the research object,comparison results of limit load and J-integral solutions for embedded elliptical crack,propagated surface half-elliptical crack,propagated through-thickness cracks or extended surface cracks have been given,provided basis for users to use defective components reasonably.

关 键 词：埋藏裂纹 双轴加载 极限载荷 J积分 参考应力法 

分 类 号：TH123[机械工程—机械设计及理论] TB301[一般工业技术—材料科学与工程]