翼型裂纹扩展特性的试验和数值分析

Experimental study and numerical simulation on propagation characteristics of wing type cracks under compression

采用模型试验研究了受压条件下张开型翼型裂纹的断裂规律,得出了翼型裂纹的扩展路径及翼型裂纹的扩展载荷特性。通过PYTHON语言对有限元软件ABAQUS进行了二次开发,实现了裂纹扩展中网格自动重新划分功能,对裂纹的扩展过程进行了数值模拟,得出了裂纹扩展路径及其复合应力强度因子的大小。计算结果与试验结果吻合良好。结果表明:(1)压缩作用下张开型裂纹,其翼型裂纹路径具有明显渐近特征,其扩展路径的渐近线为过初始裂纹中心点、且平行于最大主应力方向的一条直线;(2)曲线翼型裂纹的复合应力强度因子大体上随翼型裂纹的长度的增加逐渐变小;对有限尺寸的裂纹体,当翼型裂纹长度较大时,其大小受边界效应影响明显。以上结论为研究岩土工程中存在的翼型裂纹扩展和失稳规律提供参考。

The propagation characteristics of wing type cracks under compression were studied experimentally.The propagation path and the characteristic of propagation load were obtained.On this basis,the propagation process of cracks was further studied by numerical simulation.The secondary development of software ABAQUS was implemented to automatically re-mesh the finite element meshes,and the maximum circumferential stress fracture criterion was used to determine the growth direction of cracks.Then,the growth of wi...