軟式野球ボールの反発および衝撃性能

抄録

Baseballs have high rigidity because they are made of cork, rubber, wool, and cowhide. However, it is safer for children and adults to play baseball with a rubber ball than a baseball because the rubber ball is a hollow two-layer ball made of rubber. Therefore, it is very important to analyze the characteristics of a rubber baseball to suggest safety measures while using the ball. In addition, it is very important to analyze the restitution and impact performance of a rubber ball in developing bat. In this study, the impact performance of A-, B-, and M-ball on a rigid wall was examined, and the restitution and impact performance of each ball were compared. The results of the experiment demonstrated that the M-ball had the lowest coefficient of restitution at a velocity of 5-10 m/s. Moreover, from 30 to 50 m/s, the coefficient of restitution for the M-ball was the same as that for the A-ball and that for the B-ball was lower. The M-ball had the highest impact load and impact pressure. However, there was little difference.