WEB Material Shock Response During Ablation
Spacecraft re-enters the earth's atmosphere traveling at hyper-sonic speed. This results in the generation of strong shock waves on the lower surface of the spacecraft. Also, atmospheric drag and aerodynamic heating result in a high rise in temperature on the spacecraft’s outer surface. This draws attention to the need for ablation studies under shock impact. The current work aims to investigate the ablation response of fused quartz under shock impact. Fused quartz samples are impacted with a 250 micron-sized micro-sphere using a laser-induced particle launch system during plasma arc ablation. The ablation is achieved in this experiment using a plasma torch and pyrometry is used to measure the temperature. Photon Doppler velocimetry and time-gated Raman spectroscopy are used as diagnostic tools to measure the stresses and chemical analysis in the material. A comparative study is done on the mechanical shock wave propagation in fused quartz at various ablation temperatures.