Phenomenological Studies of the Response of Granular and Geological Media to High-Speed (Mach 1-5) Projectiles
Final rept. 1 Sep 2010-31 Aug 2011
CHUBU UNIV (JAPAN) DEPT OF MECHANICAL ENGINEERING
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The objective of this research was to elucidate the response of geological media such as sand and soil to high-speed and high-pressure loading of projectiles. Particularly, penetration mechanics of high-speed projectiles into granular materials and response of granular media to shock waves were our substantial concern. One of unique the approaches we proposed was to collect numerical data and imaging data in laboratory scale experiments on high-speed projectile impacts using gun facilities and shock waves produced by micro-explosives in order to compare with large scale experiments. Another objective of this research was to establish tangible experimental methodology of data acquisition systems backed up with numerical data processing. In the first year scoping study, we focused ourselves on the fundamental test of several experimental methods for Eglin sand and Japan sand and successfully obtained several interesting experimental results. The second year various developments in experimental methods were employed. This is the final report of the second year of studying various phenomena induced by the high-speed impact of projectiles on sand. Phenomena studied were the behavior of ejecta and the projectile, the penetration depth and speed of the projectile, and fractured grains and pressure distribution.
- Soil Mechanics