工程结构疲劳裂纹扩展的二维边界元模拟

Now it is common that engineering structures are rupture collapse due to the propagation of initial mini-cracks. According to the fracture mechanics a boundary element model of naval gear ring was constructured for calculating by boundary elements method in this paper. Stress intensity factor was calculated by the displacement interpolation formula, meanwhile crack propagation direction was predicted by the greatest tangential tensile stress rule through Fortran program. As the crack propagated, the mesh was automatic regenerated. The influence of different rim size to the fracture of gear ring under the same initial crack and loads was analyz duing the simulation course. The result of stress intensity factor calculating by ANSYS was compared with that by boundary element method. The calculating resluts show that the method has small work load and high degree of accuracy.