金属材料表面に及ぼす衝撃波の効果

抄録

The present paper describes experimental and numerical studies to investigate effects of shock waves on the surface of a metallic material. Using shock tube which has a converging section, experiments of the collision between a shock wave and a test piece of metal which installed in the end wall of the section are conducted. The shock wave phenomenon in the shock tube is investigated by using numerical calculation. The hardness and the surface roughness of the test piece exposed to high-pressure and high-temperature regions behind the reflected shock waves generated by reflections on the end wall are measured. Furthermore, the surface and the cross section of the test piece are observed by a scanning electron microscope. The results show that the roughness of the surface of a metallic material decreases and its hardness increases by the collision between shock wave and material.