1025 Development and Performance Prediction of Water Jet Peening (WJP) : (1) Principle and Application of WJP - Takahiro AOKI; Kouichi KUROSAWA; Fujio YOSHIKUBO; Noboru SAITOU; Tetsuya ISHIKAWA; Kazuhiro NITTA; Hideaki SAKAI (The Proceedings of the Materials and Mechanics Conference, 2010)