Yo Hirota
Keio University
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Publication
Featured researches published by Yo Hirota.
International Journal of Modern Physics B | 2010
Tatsuya Ito; Shoichi Kikuchi; Yo Hirota; Atsushi Sasago; Jun Komotori
In this study, the peening behavior of shot particles in a fine particle peening (FPP) process such as velocity and impact angles were analyzed by using a high-speed-camera. Results showed that the velocity of shot particles depended on a peening pressure; the higher the peening pressure, the higher the particle velocity. The particle velocity measured in this study was approximately 120 m/s; this was much higher than that of the conventional shot peening (SP) process. This was because the air resistance of shot particles in the FPP process was higher than that of shot particles in the SP process. In order to discuss the surface modification effect of the FPP process, commercial-grade pure iron treated by the FPP process was characterized by micro-Vickers hardness tester and scanning electron microscope (SEM). Thickness of hardened layer treated with higher peening pressure was much higher than that of the lower pressure treated one. The unique microstructure with stratification patterns, which was harder than that of the other part, was observed near the specimen surface. The reason for the microstructural changes by the FPP treatment was discussed based on the kinetic energy of shot particles.
Journal of Solid Mechanics and Materials Engineering | 2008
Yo Hirota; Shoichi Kikuchi; Jun Komotori
Journal of The Society of Materials Science, Japan | 2011
Shoichi Kikuchi; Yo Hirota; Jun Komotori
Transactions of the Japan Society of Mechanical Engineers. A | 2010
Masayoshi Mizutani; Shoichi Kikuchi; Yo Hirota; Jun Komotori; Hitoshi Ohmori; Kazutoshi Katahira
Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A | 2010
Masayoshi Mizutani; Shoichi Kikuchi; Yo Hirota; Jun Komotori; Hitoshi Ohmori; Kazutoshi Katahira
Journal of Solid Mechanics and Materials Engineering | 2010
Masaki Omiya; Shoichi Kikuchi; Yo Hirota; Jun Komotori
The Proceedings of the Materials and Mechanics Conference | 2009
Masayoshi Mizutani; Shoichi Kikuchi; Yo Hirota; Jun Komotori; Hitoshi Ohmori; Kazutoshi Katahira
The Proceedings of the Materials and Mechanics Conference | 2008
Yo Hirota; Yukiko Matsumura; Shoichi Kikuchi
17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17 | 2008
Yo Hirota; Shoichi Kikuchi; Jun Komotori
The proceedings of the JSME annual meeting | 2007
Yo Hirota; Shoichi Kikuchi; Jun Komotori; Kengo Fukazawa