Abstract
A numerical code has been developed to simulate the sampling process of an 'asteroid-material sampler' in a sample return mission planed for astrophysics researches. A projectile is lunched at the velocity of several hundred m/s to crush the asteroid surface, which is assumed to consist of hard rocks. In order to analytically reproduce such high velocity impact phenomena of brittle materials, particle methods have been employed in this study. The SPH (Smoothed Particle Hydrodynamics) method and the particle joint method are used to calculate the static pressure and the deviation stress, respectively. Instant failure model and Birch-Murnaghan equation of state are used to describe material characteristics of a granite target. The calculated results could reproduce cracks generated in the granite target.
