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A Study of Fatigue Crack Growth in Shot Peened Spring Steel  

Park, Keyung-Dong (Department of Mechanical Engineering, Pukyoung National University)
Jin, Young-Beom (Department of Mechanical Engineering, Graduate School, Pukyoung National University)
Publication Information
Journal of the Korean Society of Safety / v.19, no.4, 2004 , pp. 20-24 More about this Journal
Abstract
Antifatigue failure technology take an important the part of current industries. Currently, the shot peening is used for removing the defect from the surface of steel and improving the fatigue strength on surface. Therefore in this paper the effect of compressive residual stress by shot peening on fatigue crack growth characteristics in stress ratio(R=0.1, 0.3, 0.6)was investigated with considering fracture mechanics. There is difference between shot peening specimen and unpeening specimen. Fatigue crack growth rate of shot peening specimen was lower than that of unpeening specimen. Fatigue lift shows more improvement in the shot peening material than in the unpeening material. And compressive residual stress of surface on the shot peening processed operate resistance force of fatigue crack propagation. That is the constrained force about plasticity deformation was strengthened by resultant stress, which resulted from plasticity deformation and compressive residual stress in the process of fatigue crack propagation.
Keywords
crack growth stress ratio; fatigue lift; fatigue crack; compressive residual stress;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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