Generated Force and Deformation at a Conical End of an Aluminum Bar due to Impact : Effect of the Length of a Bar

In studying the dynamic behavior of a body under impulsive loading, it may be fundamentally important to analyze elastic/plastic deformation at a contact part and to analyze the impulsive force generated at that part. In this study, the deformed shape at the contact part and the generated impulsive force have been measured when an aluminum bar, whose end is a truncated cone, collides axially, perpendicularly against a devised sensing plate. The length of the bar was selected in the range from 0.2m to 2m. It was found through the experiments that a new truncated cone was formed at the contact end, and that the conical angle of the cone depended only on the conical angle of the former cone before the collision. It was also confirmed that the generated mean stress on the boundary plane between the deformed part and the undeformed part at the impact end was constant and independent of the shape of the cone and of the length of the bar.