Host: The Japanese Society for Planetary Sciences: Local Organizing Committee for 2007 Fall Meeting
Cratering on brittle materials in the strength regime is controlled by each target strength, initial peak pressure, shock attenuation rate in the target, and density ratio between target and projectile materials. We showed that the crater depth and di-ameter depends on the uniaxial compressive and tensile strength, respectively (Hiraoka et al., submitted). In the solar system, porous structure has been found to be common among small bodies (e.g. Britt et al., 2002). Thus, we investigate the effect of target porosity on the cratering in the strength regime.
We made sintered glass bead-silicate mixtures as the target. We performed impact cratering experiments on mixture targets at high velocity (2.5km/s to 3.5km/s) and low velocity (about 200m/s) and measured uniaxial compressive and tensile strength. In order to investigate the effect of density ratio between target and projectile materials we used glass and stainless sphere as the projectile. We will compare the results with previous studies and report the effect of density ratio and target porosity on the cratering.
