鋼球の傾斜衝突によるくぼみ形状とくぼみの軟化および硬化

概要

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When a hard steel sphere over a range of impact velocities (80-100 m/s) and impact angles (15-90°) is projected obliquely onto three ductile metal targets, the shapes of the plastic craters and the softening or hardening of the craters were measured. Their variations with impact angle were experimentally obtained. It is observed that a pronounced lip is formed at the end of the crater for an impact angle of 45°in the three targets. It can be assumed that such a large lip will be easily detached during abrasive grit-blasting. The hardness at the crater periphery except for the lip and the interior of the crater were measured by means of a micro-vickers hardness tester. The hardness of a mild steel crater at an impact angle of 15°is less for the residual tensile deformation due to the tangential component of the oblique impact than for the virgin specimen. The hardness of the craters of other soft metal targets except for steel increase with the impact angle. Cracks in the piling-up were observed using SEM. The impact and rebound angles of the sphere projectile were also measured using a CCD camera.
社団法人日本機械学会の論文
1997-09-25