Cavitation Shotless Peening for Improvement of Fatigue Strength

  1. Prof. Dr.-Ing Lothar Wagner Chairman of ICSP8
  1. Hitoshi Soyama,
  2. Dan Odhiambo and
  3. Kenichi Saito

Published Online: 7 FEB 2006

DOI: 10.1002/3527606580.ch55

Shot Peening

Shot Peening

How to Cite

Soyama, H., Odhiambo, D. and Saito, K. (2003) Cavitation Shotless Peening for Improvement of Fatigue Strength, in Shot Peening (ed L. Wagner), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606580.ch55

Editor Information

  1. TU Clausthal, Institut für Werkstoffkunde und Werkstofftechnik, Agricolastr. 6, D-38678 Clausthal-Zellerfeld, Germany

Author Information

  1. Department of Machine Intelligence and Systems Engineering, Tohoku University, Sendai, Japan

Publication History

  1. Published Online: 7 FEB 2006
  2. Published Print: 12 MAY 2003

ISBN Information

Print ISBN: 9783527305377

Online ISBN: 9783527606580

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Keywords:

  • cavitation shotless peening;
  • fatigue strength

Summary

This paper gives an overview of the art, craft and science of “Cavitation Shotless Peening” as a new method of turning the traditional negative effects of cavitation in hydrodynamic machinery to more positive industrial applications.

Impact at cavitation bubble collapse can be used to improve the fatigue strength just as the same way as shot peening. Cavitation impacts can peen the surface without the use of shot. Hence, it is a kind of shotless peening, and herein termed Cavitation Shottless Peening (CSP). The peened surface by CSP is less rough compared with shot peening, since there is no solid body collision involved. In the present sturdy, cavitation impacts were produced by a submerged high speed water jet with cavitation, i.e., a cavitating jet. The cavitating jet differs completely from a normal water jet in air.

To explore the potentials of CSP as a means of inducing surface compressive residual stress and subsequently increasing fatigue strength of materials, silicon-manganese alloy (JISSUP7) and an aluminum alloy (JIS AC4CH) specimens were peened by a cavitating jet. The residual stress was measured by an X-ray diffraction method.

Experimental results confirmed that the rotating beam (R = −1) fatigue strength of silicon-manganese alloy increased by 41% while that of aluminum alloy increased by 56% in comparison with non-peened specimens.