二维弹塑性有限元网格与J积分计算精度

Two-Dimensional Elastic-Plastic Finite Element Meshes ntergral Calculations

研究了二维Ｊ积分弹塑性有限元法辐射状网格划分时网格密度、畸形单元等对中心贯穿裂纹及缺口试样Ｊ积分值计算精度的影响。推荐选用８０左右单元的网格计算平面问题典型试样的Ｊ积分，说明它具有较高的精度和非常短的机时，个别畸形单元的出现对Ｊ积分计算影响甚微等优点。并指出划分网格时应避免大钝角和狭长阿格的出现。

The influence of the number of meshes divided in radiant form,abnormal elementS,etc. on the Precision of J-intergral calculations for thr centre Cracked or notChed speCimens has been inveStigated when the two dimensional elastic-Plastic finite element method was adopted. It is shown that the J-integtal value Calculations of typical speimens of Plane problems would be of higher Precision and take a shorter CPU time by choosing the meshes of some eighty elementS. Only one or two abnormal elementS have a very weak effeCt on the Calculations. However, large obtuse angle elementS or very long and narrow elementS should be avoided in division of meShes.