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为解决三维裂纹研究需要，本文开发了一套基于增量理论的三维弹塑性有限元程序，并编制了使用虚裂纹扩展法计算J积分的后处理程序。通过计算中心穿透裂纹和表面裂纹J积分并与现有解进行比较，考核了该程序的计算精度。在此基础上，计算了中心理藏裂纹J积分JE并与相应的穿透裂纹J积分JT进行比较，提出以p／a＝0．4作为埋藏裂纹再表征为穿透裂纹的控制条件。
In order to solve the need of 3D crack research, a three-dimensional elasto-plastic finite element program based on incremental theory was developed and a postprocessing program was developed to calculate J integral using virtual crack propagation method. The calculation accuracy of this program is evaluated by calculating J integral of crack penetration and surface crack through calculation center and comparing with existing solutions. On this basis, the J integral JE of the central reservoir crack is calculated and compared with the corresponding JT JT of the penetration crack. The control condition that p / a = 0.4 is used as the buried crack and then characterized as the penetration crack is proposed.