Abstract
We investigated about a perforation behavior of a 0.8mm thin steel plate by a fired 38 caliber bullet. The two bullets, Full Metal Jacket (FMJ) and Lead Round Nose (LRN), were fired by a 38 caliber revolver. The perforation behavior was taken by a high speed camera with 105 frames per second. A collision side of the fired bullet and a thin steel plug punched out by the fired bullet were observed. A compressive stress area was occurred at the center of the collision side. On the thin steel plug, an area adhered of the bullet material was observed in the circumference of the compressive stress area. It was thought that the adherent of the bullet material occurred by the friction between the fired bullet and the thin steel plate. Because the collision side of the fired bullet was flat, it was thought that the bullet deformed before the thin steel plate started to deformation. The thin steel plate was indented by the fired bullet. Then, a circular crack occurred on the thin steel plate. The edge of the crack on the thin steel plate corresponded to the edge of the flat area on the fired bullet. The fired bullet passed the circular crack, and a hole opened.
