解相关路径的裂纹扩展模拟及其应用

Solution-dependent Path Crack Propagation Simulation and Its Application

化工设备的断裂失效事故多发且危害严重,裂纹扩展模拟分析具有应用价值。裂纹扩展多基于预设路径进行模拟,在较复杂的情况下,裂纹的扩展路径是未知的,对裂纹扩展准确模拟会遇到困难,导致工程应用受到限制。基于扩展有限元法、内聚力模型和连续损伤力学,实现解相关路径的裂纹扩展模拟仿真,并通过一个实际工程失效案例——新氢机排气阀盖断裂失效,对模拟方法进行了应用探讨。结果表明,模拟能够得到潜在的断裂失效发生位置与裂纹扩展路径,且与实际断裂事故基本吻合,对失效分析和事故预防具有指导作用。

Fracture failure of chemical machinery frequently happened with serious damage,so that the crack propagation simulation had significance in application.The crack propagation simulation usually based on predefined-path.In complex conditions,the propagation path was unknown,so that the accuracy of simulation was decreased and the application of fracture simulation was limited.This paper developed one kind of solution-dependent path crack propagation simulation method based on eXtended Finite Element Method（XFEM）,Cohesive Model and Continuum damage mechanics.One practical example was taken to introduce the application of the method.Results suggest that simulation could assist failure analysis and accident prevention by show the potential fracture region and crack propagation path,which met the real fracture failure history.