复合型裂纹张开位移和裂尖附近塑性区域的有限元分析

FINITE ELEMENT METHOD ANALYSIS OF CRACK OPENING DISPLACEMENTS OF MIXED MODE CRACK AND PLASTIC ZONE NEAR THE CRACK TIP

用ＣＡＤ技术和Ｃ语言知识，对受双向载荷含Ⅰ－Ⅱ复合型裂纹十字形板进行了计算机自动划分有限单元体网格并生成数据文件。采用四边形八节点等参元对含Ⅰ－Ⅱ复合型裂纹十字形板进行了弹塑性有限元分析，获得了裂尖附近塑性区形状。弹塑性有限元法计算的裂纹面张开位移与试验结果相吻合。

The finite element meshes are formed and the related data are obtained from cruciform specimen with a central penetrated ⅠⅡ mixed mode crack under biaxial loading, based on CAD and C language by computer. The quadrilateral eight node isoparametric elements are employed and cruciform specimen with ⅠⅡ mixed mode crack is investigated in elasticplastic finite element analysis. The plastic zones near the crack tip obtained and the crack opening displacements calculated by elasticplastic finite element method agree with the experimental results.