Thin Plate Bumper Influence on Crater Formation in Thick Aluminum Targets

概要

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For studying the generation of space debris, we experimentally investigated the penetration of steel projectiles into thick targets made of aluminum alloy 5056 and the subsequent crater formation in the velocity range from 0.7 to 1.9 km/s using a two-stage light gas gun. We added 1- and 2-mm-thick pure nickel plates and 2-mm-thick aluminum alloy plates to the thick targets, and examined the effects of plate addition, plate material, and plate thickness on the crater shape (depth, diameter, depth/diameter ratio) and lip formation. The plate addition suppressed the formation of crater lips and changed the crater shape. In particular, addition of nickel plates decreased the crater diameter, depth, and depth/diameter ratio. Furthermore, component analyses by scanning electron microscopy indicated the presence of Ni-Al alloy near the crater wall and Ni-Fe alloy in the post-impact projectile when nickel plates were used.