【摘要】 以含椭圆形双裂纹均质平板为研究对象，基于Gurson-Tvergaard-Needleman(GTN)损伤模型，针对不同尺寸椭圆形双裂纹的合并行为进行研究，并对基于裂纹间距比的椭圆形双裂纹合并准则进行了探索。结果表明，在以裂纹间距比为坐标的坐标系中，裂纹合并区域与不合并区域存在着明显的分界线。在分界线及下方为双裂纹合并区域，在分界线上方为双裂纹不合并区域。基于裂纹间距比，可建立椭圆形双裂纹合并准则。更多还原

【Abstract】 Based on the Gurson-Tvergaard-Needleman(GTN) damage model, the coalescence behavior of double elliptical cracks with different sizes and the coalescence criterion based on crack spacing ratio was studied in homogeneous plates with elliptical double cracks. The results show that there is an obvious dividing line between the crack coalescence region and the non-coalescence region in the coordinate system based on the crack spacing ratio. The rigon below and on the boundary line corresponds to the coalescence of double cracks, while the region above the line corresponds to the noncoalescence of double cracks. Based on the crack spacing ratio, the coalescence criterion of double elliptical cracks can be established.更多还原