工字型梁腹板中Ⅲ型裂纹应力强度因子分析

摘要

In this paper ,based on energy release rate ,the J integral energy expressions of crack type Ⅲ under plane strain condition is studied . The stress singular field of the crack tip in I-beam web is simulated by finite element software , the stress and displacement distribution of the crack zone are obtained by numerical simulation ,and the stress intensity factor and the J integral are calculated ,the feasibility of the expression is verified .%基于能量释放率研究Ⅲ型裂纹平面应变条件下的 J积分能量表达式。采用有限元软件模拟了工字梁腹板受扭转时裂纹裂尖应力奇异场，通过数值模拟得出裂纹区的应力、位移分布状态，并计算应力强度因子和J积分，从而验证表达式的可行性。