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Effect of Stress Ratio on Fatigue Fracture of a Shot Peening Marine Structural Steel  

PARK KYOUNG-DONG (부경대학교 기계공학부)
JIN YOUNG-BEOM (부경대학교 기계공학부 대학원)
PARK HYOUNG-DONG (부경대학교 기계공학부 대학원)
Publication Information
Journal of Ocean Engineering and Technology / v.18, no.5, 2004 , pp. 43-49 More about this Journal
Abstract
The lightness of components required in the automobile and machine industry necessitates the use of high strength components. In particular, the fatigue failure phenomena, which occurs when using metal, increases the danger to human life and property. Therefore, antifatigue failure technology is an integral part of current industries. Currently, the shot peening is used for removing the defect from the surface of steel, while improving the fatigue strength on surface. Therefore, in this paper, the effect of compressive residual stress of spring steel(JISG SUP-9) by shot-peening on fatigue crack growth characteristics in a stress ratio(R=0.1, R=0.3, R=0.6) was investigated, giving consideration to fracture mechanics. By using the methods mentioned above, following conclusions are drawn: (1) The fatigue crack growth rate(da/dN) of the shot-peening material was lower than that of the un-peening material and in stage I, ΔKth, the threshold stress intensity factor of the shot-peen processed material is high in critical parts, unlike the un-peening material. Also m, fatigue crack growth exponent and number of cycle of the shot-peening material, was higher than that of the un-peening material, as concluded from effect of da/dN. (2) Fatigue life shows more improvement in the shot-peening material than in the un-peening material, and the compressive residual stress of surface on the shot-peen processed operate resistance of fatigue crack propagation.
Keywords
Marine Structural Steel; Shot Peening; Crack Growth; Stress Ratio; Threshold Stress Intensity Factor; Fatigue Crack Growth; Stress Intensity Factor; Compressive Residual Stress;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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