325 有限要素解析によるカーブキックのインパクトにおけるボール挙動シミュレーション(スポーツにおける打撃(1))

Abstract

This study constructed finite element models of the simplified foot and soccer ball, and examined the factors affecting the ball behavior in curve kick. A 3D finite element model of the foot was developed using the barefoot and footwear shapes, which were obtained from a 3D laser scanner. A finite element model of the ball consisted of composite shell elements that include a hyperelastic model to define the latex bladder layer and a viscoelastic model to define the outer panels. Five experienced male university soccer players performed curve kicks. The kicking motions were captured three-dimensionally by two high-speed cameras at 2,500 fps. The models were validated by comparing the results of the finite element analysis to those of the experiment. Simulations of the ball behavior were conducted using the finite element models. The simulation results indicated the following. The ball velocity is largely affected by the foot velocity immediately before impact but barely affected by the Young's modulus of the shoe upper and the coefficient of friction. The ball rotation is affected by the foot velocity immediately before impact and the coefficient of friction; however, these factors had no significant effect.