Other

Sri Sports Limited

Noritoshi Nakagawa

Kiyoto Maruoka

Kaname Yamada

Jun Nishibayashi

Yasuhisa Sekiguchi

Seigo Sakagami

Hiroshi Yoshinaga

A viscoelastic characteristic value-measuring apparatus, using a split Hopkinson's bar, having an impact bar, input bar, and an output bar. The input bar has a first strain gauge and a second strain gauge. The output bar has a third strain gauge and a fourth strain gauge. The input bar and the output bar are made of a viscoelastic material, and a specimen is in between the input bar and the output bar. The length of said output bar is set to a range from 500 mm to 2500 mm both inclusive. The length of said input bar is set to a range from 1500 mm to 2500 mm both inclusive.

Viscoelastic characteristic value-measuring apparatus and method of measuring viscoelastic characteristic value

A golf ball is composed of a core ( ) and a cover ( ) covering the core ( ). The core ( ) is composed of a cross-linked rubber whose Young's modulus lies in the range of 3O Mpa to 100 Mpa both inclusive and whose loss factor lies in the range of 0.01 to 0.45 both inclusive, when the Young's modulus and the loss factor are measured by a split Hopkinson's bar tester whose impact bar has a collision speed of 14.0 m/sec.

Golf ball

Growing community of inventors

Hiroshima, Japan

Noritoshi Nakagawa