Improvements in SPH method by means of interparticle contact algorithm and analysis of perforation tests at moderate projectile velocities

Smooth particle hydrodynamics (SPH) is a new effective technique for impact simulation. SPH approximations are quite flexible and allow various constructions. In this paper contact interaction between SPH particles described by Riemann solution for normal and tangential discontinuities break-up is introduced in SPH-formulation. The conception is to insert in SPH approximations the velocity and stresses at the contact surface determined by Riemann solution instead of mean values between velocities and stresses of contacting basic and surrounding particles. In this case there is no need to use artificial viscosity. Two-dimensional axisymmetrical code for elastoplastic media was created and computations were compared with test data for perforation of steel plate by lead projectile.