• Surface modification method to improve fatigue strength has been developed using cavitation impacts, which are normally causes severe damage in hydraulic machineries. The method was called "cavitation peening". In order to make clear the mechanism, a load controlled plate bending fatigue test machine was developed. It was proved by using the test machine that the threshold level of stress intensity factor was improved about 1.9 times by cavitation peening. The mitigation of hydrogen embrittlement by cavitation peening was also improved.

The cavitation peening can apply to component of automobile and forging die. We hope to conduct collaborative research with a willing company for a practical application of this technology in industry.

• Fatigue Strength
• Surface Modification
• Cavitation
• Residual Stress
• Hydrogen Embrittlement
• Residual Stress
• Peening
• Hydrogen