裂纹扩展下流形元覆盖更新和参数继承方法

The numerical manifold method(NMM)provides a unified solution for solving continuous and discontinuous problems,with the premise of ensuring the accuracy and stability of the covering generation system.A covering updating method is developed based on the NMM covering system generation theory to address the covering generation problem under crack extension and new crack initiation,which is simple to implement and effectively eliminates the refinement mesh at the crack tip before extension,and realizes mesh refinement at the crack tip after extension.Moreover,to deal with the parameter inheritance issue introduced by the introduction of the crack tip asymptotic function,a parameter inheritance strategy covering conventional physical coverage and singular physical coverage is proposed.By conducting multiple-crack extension and new crack initiation tests on rectangular plates with two initial cracks and comparing the results with SCB specimen experiments,the accuracy of the proposed method in simulating crack propagation is verified.