1992 年 58 巻 556 号 p. 2365-2369
As athletic skills improve and athletic equipment, such as baseball bats, tennis rackets, and golf clubs, is exposed to high-speed loading, the dynamic strength as well as static strength should be examined. In this article, baseball bats made of aluminum alloy which are supported elastically at their center of percussion are impacted by actual balls at various speeds and the induced strain waves and the dynamic deformations are observed. In order to conduct unified high-speed impact tests of baseball bats and other equipment, and to develop some new industrial materials to be used for athletic equipment. a high-speed gas gun to launch baseballs and many kinds of projectiles is constructed.