A MODIFIED COMPRESSIBLE SMOOTHED PARTICLE HYDRODYNAMICS (MCSPH) METHOD AND ITS APPLICATION ON THE NUMERICAL SIMULATION OF LOW AND HIGH VELOCITY IMPACTS

In this study a Modified Compressible Smoothed Particle Hydrodynamics (MCSPH) method is introduced which is applicable in problems involve shock wave structures and elastic-plastic deformations of solids. As a matter of fact, algorithm of the method is based on an approach which descritizes the momentum equation into three parts and solves each part separately and calculates their effects on the velocity field and displacement of particles. The most exclusive feature of the method is exactly removing artificial viscosity of the formulations and representing good compatibility with other reasonable numerical methods without any rigorous numerical fractures or tensile instabilities while MCSPH dose not use any extra modifications. Two types of problems involve elastic-plastic deformations and shock waves are presented here to demonstrate the abilities of MCSPH in simulation of such problems and its capability of shock capturing. The problems that are proposed here are low and high velocity impacts between aluminum projectiles and semi infinite aluminum beams. Elastic-perfectly plastic model is chosen for constitutive model of the aluminum and the results of simulations are compared with other reasonable studies in these cases.