624 Impact Analysis on Elastic Spherical Shells

Abstract

Many researchers have studied the impact phenomenon in ball games, such as golf, tennis, baseball, soccer and so on. Although it is very important to understand the dynamic characteristics of a ball on the impact phenomenon, the sufficient theoretical understanding of the characteristics has not been obtained. In this paper, normal impact of hollow balls on flat surfaces is theoretically analysed and the dynamic deformation of hollow balls is derived as an axisymmetric motion of an elastic spherical shell by using modal expansion method, where variation of contact area is took into account. Numerical calculation has conducted and the dynamic characteristics are discussed.