Numerical simulation of hypervelocity solid-solid impacts using improved SPH method

In the simulation of hypervelocity impacts by means of a SPH method, the loss of interactions among the particles causes numerical fractures. To prevent the numerical fractures, the 2-dimensional SPH method is improved. The improved SPH method uses a new particle generation technique and a particle reducing technique. In the new particle generation technique, new particles are generated when the area with no particles or the distance between the adjacent particles exceeds a certain value. In the particle reducing technique, two particles approaching each other are combined to one when the distance between them attains a certain value. The particle reducing technique is used to avoid the overabundance of particles. The hypervelocity impact of a polyethylene projectile on an aluminum plate target is simulated. Through the numerical results, it is shown that the improved method can effectively prevent the numerical fractures without the overabundance of particles.