3D shape distribution of fragments ejected by high-velocity impact to a dunite target

Abstract

We performed impact experiments of cratering using a two-stage light gas gun at Kobe University. We used a dunite block (10 x 10 x 3 cm) as a target and a Nylon projectile (1.6 mm in diameter).  Small fragments of the ejecta (~100 μm) were captured by silica aerogel (110 mg/cc). Their 3D shape distribution were measured in-situ using a high resolution X-rays CT machine. We also measured 3D shape distribution of fragments which were not penetrated into the aerogel with low ejection velocities, using SR-based micro-tomography at SPring-8. We compared these results with Itokawa particles.