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

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.