Abstract
This study investigates the fatigue strength improvement by the hammer peening treatment. The fatigue life is evaluated by dividing into the crack initiation life and the crack propagation life. The improvement effects of peening treatment are verified from the viewpoints of stress concentration, residual stress distribution, plastic deformation, and crack propagation behavior. From the measurement of residual stress and plastic deformation, it is indicated that the region where the compressive residual stress introduced by the peening treatment exists gives close agreement with the plastic (hardening) region. The fatigue test results show the reduction of stress concentration improves the crack initiation life significantly. The crack propagation rate retards even if the fatigue crack propagates over the region where the compressive residual stress has originally existed. Therefore, the hammer peening treatment increases both the crack initiation and propagation lives.
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