Hertzの接触理論をふまえた動的有限要素法によるシャルピー試験片の衝撃応答に対する刃先半径の影響解析

抄録

In this paper, the influence of striker radius on impact response for Charpy specimen was investigated by means of a dynamic finite element analysis. Three-dimensional explicit finite element analysis was performed by considering the contact stiffness between the Charpy specimen and striker according to the Hertzian contact theory. Charpy impact tests were conducted with instrumented striker for a mild steel. The inertial oscillation in contact load between striker and specimen obtained by finite element analysis was almost consistent with the experimental data measured by instrumented Charpy tests. The striker radius affected the magnitude and period of the peak inertia load. It was found that the magnitude of the peak inertia load increase with increasing in striker radius. On the other hand, the dynamic stress field near the V-notch in the Charpy specimen was not affected by striker radius when the time elapsed more than two times of the oscillation period.