抄録
The objective of this study was to grasp the relationship between golf club conditions and the rebound of a ball, and to investigate the factor of the relationship using a finite-element (FE) analysis on a ball colliding with a simplified club. The clubs were constructed by holding simplified clubheads by a locking ring fitted onto a steel shaft. The clubheads were designed based on the mass, volume and position of centre of gravity of commercial clubheads, so as to enable a typical golf impact. Three circular, hollow, titanium alloy bodies of constant mass, with increasing loft angle, were manufactured. FE models with linear elasticity of the clubs, which consisted of the clubheads, a locking ring and a shaft, were constructed. The FE model of the ball consisted of 8-node solid elements, and the material model was expressed as a hyperelastic/viscoelastic model. Impact experiments were also conducted for comparison to confirm the accuracy of the FE models. The results of impact simulations closely matched the experimental results. FE analyses, which varied Young's modulus of the shaft and an added mass attached to the shaft using the constructed models, were conducted to investigate the effect of club conditions upon the ball rebound. The effect for the rebound velocity tended to be small, and the rebound angle and spin rate were affected by the force on the shaft which prevented the clubhead from moving and the rotation of the clubhead which depended upon Young's modulus of the shaft and the weight and position of the added mass.
