三维非平面裂纹扩展参数化模拟方法

发展一种基于有限元方法（FEM）的自动模拟三维非平面裂纹扩展的模拟方法。该方法采用参数化建模的方式建立裂纹体,以镶嵌裂纹体的方式在结构中插入裂纹,然后通过有限元计算得到裂纹扩展参量,自动更新裂纹体从而模拟裂纹的扩展过程。通过模拟三个裂纹扩展算例,计算了裂纹扩展循环数,对比试验结果,误差分别为195%、161%、21%。结果表明:该方法能够模拟三维非平面裂纹的扩展并计算扩展寿命,具有一定的精度和适用性。 

Parametric simulation method for 3-D non-planar crack propagation

An automatic 3-D non-planar crack propagation simulation method based on finite element method (FEM) was developed. This method established cracked block by parametric modeling method, inserted initial crack in structure model by inlaying the cracked block, then acquired crack propagation parameters through FEM analysis; then it automatically updated cracked block to simulate the propagation process of crack. Through the simulation of three crack propagation cases, the crack propagation cycles were calculated; compared with the experimental results, the errors were 19.5%, 16.1%, 2.1% respectively. The results show that this method can simulate non planar 3-D crack propagation and calculate propagation life with accuracy and applicability.