High-precision Path Prediction Simulation of Non-straight and High-speed Propagating Crack

Abstract

Summary In this study, numerical simulations of mixed-mode fracture paths in dynamic fracture phenomenon are carried out by using moving finite element method based on Delaunay automatic mesh generation. In addition, the experiments under same condition was carried out, and the both results were compared. The calculated paths by the simulation agree well with the fracture paths of the experiments. In thisstudy,we simulated dynamic fracture path structuressubjectto eccentric impact loading moving finite element method based on Delaunay automatic mesh generation(1)(2)(3). In past times, we did computer simulations of path prediction at load eccentricity ratio e=0.1, 0.2, 0.3 in our laboratory(4)(5). However, in case the ratio is 0.2 and 0.3, the face of primary crack made contacts. For highly accu- rate path prediction up to the edge to be possible, it is necessary to developed the program that considered this contact phenomenon. We did a more highly accurate numerical analysis by using the program that consider the contact phenomenon. Moreover, we carried out theexperiment theimpact destructionunderthe same condition that used optical interferometrical observation(6) together, the fracture path obtained by the numerical simulation is compared with the experiment route, then the validity of this method was verified. The calculated path by the simulation agree well with the results of th e experiments. Moving Finite Element Method Based on Delaunay Automatic Mesh Generation Momentarily modifying the mesh pattern is necessary for the crack propaga- tion phenomenon is analyzed with a high degree of accuracy. Using conventional moving finite element method is difficult in case that the crack curve in an arbitrary direction. The moving finite element method based on Delaunay automatic mesh