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http://dx.doi.org/10.3795/KSME-A.2003.27.1.200

A Study on The Effect of Compressive Residual Stress on fatigue Crack Propagation Behavior of Spying Steel  

Park, Keyoung-Dong (부경대학교 기계공학부)
Jung, Chan-Gi (부경대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.27, no.1, 2003 , pp. 200-207 More about this Journal
Abstract
In this paper, the effect of the compressive residual stresses which were obtained under the various shot velocities of shot balls on the fatigue behaviors of a spring steel, were investigated. The examination of CT specimen test were executed with the materials(JISG SUP9) which are being commonly used for the springs of automotive vehicles. As a result, the optimal shot velocity of shot balls were acquired considering the peak values of the compressive residual stresses on the surface of specimen and effect on the speed of the fatigue crack propagation da/dN in stage II and the threshold stress intensity factor range Δ$K_{th}$ in stage I. Also the material constant C and the crack propagation index m in the formula of paris law da/dN= C $({\Delta}K^m)$ were suggested in this work to estimate the dependency on the shot velocity.
Keywords
Spring Steel; Shot-peening; Over Peening; Compressive Residual Stress; Fatigue Crack Propagation; Striation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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