修正的B-E模型对裂纹快速扩展的数值模拟

A simulation of rapid crack propagation using a modified B-E model

在连续损伤力学和突然损伤模型的基础上 ,提出了利用修正的 B- E模型来模拟裂纹的快速扩展 ,所得到的有限元模型可以在无裂纹扩展速率的前提下模拟裂纹的快速扩展 ,得到的结果与实验得到的裂纹扩展速率值相当 ,说明该方法可以用于模拟裂纹的快速扩展过程。

The double parameter model simulating the rapid crack propagation is proved on the basis of the damage mechanics and the sudden damage model. In this model, the damage ratio is considered when the rapid crack propagation was simulated by finite element method. Using this model and the damage when the material is destroyed, the crack propagation rate can be obtained by FEM without the crack rate. And the result, gotten by the FEM is very close to the result gotten by the experiment. It is showed that this method can be used to simulate the crack propagation.