| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that it is difficult for prior art to inexpensively and highly reliably extend the fatigue life of a metal material subjected to a repeated load history. SOLUTION: The method of extending the fatigue life of the metal material 1 subjected to a repeated load history comprises applying non-destructive inspection to the metal material for detecting a crack 2, and giving ultrasonic wave peening work to the detected crack. COPYRIGHT: (C)2010,JPO&INPIT
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