Numerical study on the fracture characteristics of projectile material under impact loading

Abstract

As one of the most common material used for projectile, the numerical simulation about high strength steel about its fracture characteristics under impact loading has always been emphasized. These kinds of problem often involved in the non-linear dynamic response and fracture of multi-material at high temperatures and pressures and strain rate. We put forwards a kind of mapping algorithm about local marked particles through coupling Lagrangian particles and Eulerian meshes. It is obtained by adding marked particles with regular hexahedral influence domain. According to the topological relation between particles and cells, the physical variables of cell are mapped to particles by weighted influence domain. Based on MPI standards, 3D parallel multi-material program with particles was developed. Besides, Johnson-Cook constitutive equation and fracture criterion about effective strain. A series of penetration in different working conditions were simulated and compared with experiment. It is found that the algorithm, which combines the best feature of Eulerian method and Lagrangian method, could be applied in simulating large deformation and fracture process of metal material. At the same time, the computational efficiency and accuracy could also be guaranteed. It is concluded that the improvement could make the algorithm more suitable for the simulation of various impact dynamic problems.