Seminar: CPS Seminar
date: 2018 February 9 (Fri) 16:00-17:30
room: CPS Conference Room

speaker: Kosuke Kurosawa (Associate Staff Scientist, Planetary Exploration Reserch Center)
title: A reappraisal of the processes of material ejection due to hypervelocity impacts
abstract: Impact ejection is an inevitable outcome after hypervelocity impacts because an excavation flow is driven due to a strong shock wave.
It is widely known that the ejection processes are classified into three stages depending on ejection timing, location, velocity and pressure: (1)jetting, (2)spallation, and (3)normal excavation.In most cases, the three processes has been studied individually.
We have been re-visitted the ejection processes to understand the ejection processes by a unified manner, that is the outcome of an interaction between a shock wave and an expansion wave toward the free surface.In the presentation, we will introduce the obtained results in the light of our theoretical framework and will discuss the retained problems.
keywords: Hypervelocity impacts, Jetting, Spallation, Normal excavation, Impact experiments, Numerical modeling

organizer: Fumihiko Ushui