Evaluation of Optimal Condition in Laser Shock Peening Process by AE Method
Laser shock peening (LSP) is now recognized as an efficient surface treatment to improve the fatigue life of metal components.To evaluate the process conditions,Almen strip is used as well as shot peening.As this is limited to specific material and size,we cannot apply to a wide variety of substrates.Acoustic emission (AE) method is expected to be useful for understanding LSP process because an elastic wave generates when laser is radiated on a target.The water layer on a target confines the shock wave due to laser irradiations during LSP process.In this study,laser irradiations during LSP process were monitored by AE method with varying the temperature and the thickness of the water layer on a target,respectively.Impact forces during LSP process were obtained from detected AE waveforms by deconvolution technique.In addition,laser irradiations were observed by high speed camera,and the image was compared with the detected AE signal.This result shows that shock wave was emitted by not only laser ablation but also collapse of a bubble which was generated after laser irradiation and a bubble was affected by the water layer.
Laser shock peening Acoustic emission Cavitation bubble
Tomoki Takata Manabu Enoki Akinori Matsui Yuji Kobayashi
Department of Materials Engineering,School of Engineering,The University of Tokyo,7-3-1 Hongo,Bunkyo Shintokogio,Ltd.,1-1-1 Nishiki,Naka-ku,Nagoya city,Aichi 460-0003,Japan
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）