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Effect of Indentation Residual Stresses on the Fatigue Crack Initiation Life  

이환우 (경남대학교 기계자동화공학부)
강태일 (경남대학교 기계자동화공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.21, no.5, 2004 , pp. 158-165 More about this Journal
Abstract
Up to now, many crack repair techniques have been developed for inhibiting crack growth in structural components. However, the simplest way for inhibiting crack growth is to apply a indentation at the crack tip or at some distance ahead of the expected crack growth path so as to produce residual compressive stresses that can reduce the effective stresses around the crack tip. In spite of its importance to the aerospace industry, little attention has been devoted to evaluation of the indentation residual stress effect on the fatigue crack initiation life quantitatively. Therefore, in the present work, the magnitude and distribution of the indentation residual stresses were investigated in order to estimate the beneficial effect on fatigue crack initiation by using finite element method. Furthermore, to examine the validity of finite element analysis results, residual stress distribution in the indented specimen was measured by using X-ray diffraction technique, and fatigue crack behavior at fastener hole in aluminum alloy 7075-T6 before and after indentation processes was investigated.
Keywords
Indentation; Residual stress; Finite element method; X-ray diffraction technique; Fatigue; Crack initiation life;
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Times Cited By KSCI : 2  (Citation Analysis)
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