Effect of Ultrasonic Shot Peening on Fatigue Strength of High Strength Steel

Author:  Watanabe Hattori Handa Hasegawa Takaji Ikeda Ducha
Source:  Conf Proc: ICSP-8 Sept. 16-20, 2002 Garmisch-Partenkirchen, Germany
Doc ID:  2002039
Year of Publication:  2002
Authors Yoshihiro Watanbe, Kaneshi Hattori, Mitsuru Handa, Toyo Seiko, Japan Norihiko Hasegawa, Keiro Tokaji, Masahide Ikeda, Gifu University, Japan Jean Michel Duchazeaubeneix, Sonats, France Abstract A study had been made to evaluate the effect of the Ultrasonic shot peening treatment, developed by SONATS, on fatigue strength. This new shot treatment could give the smooth surface after shot peening because of using the polished ball bearings. To investigate the effect and the merit of new treatment, fatigue test were conducted on cantilever type rotating bending fatigue testing machine. It was confirmed that fatigue strength peened by ultrasonic shot treatment is almost the same as that peened by conventional air peening device. Further, mechanism of the fracture was confirmed between roughed specimens by conventional peening and the smooth one by ultrasonic peening. Key words: Ultrasonic Shot Peening, twofold S-N curve, fish-eye, inclusion, ultra-high-cycle fatigue

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