Assessment of J-Integral for Three-Dimensional Surface Crack at Notch Root
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概要
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The contour J-integral values were calculated using the three-dimensional elastic-plastic finite element method for semielliptical surface cracks originated at notch roots under tensile loading. Then these were compared with the J-integral values calculated using the conventional equation we proposed in earlier papers, which we refer to as J hereafter. The difference between the two was quite small at the deepest point A in the semielliptical surface crack, but was fairly large at the edge of a crack on the specimen surface, C. The conventional equation was modified by considering stress/strain gradients developed in the cross section at the notch root. The J-integral value calculated using the proposed equation, J′ was in quite good agreement with the contour J-integral value at both points, A and C in a semielliptical surface crack. The difference between the ratio J/J′ and 1.0 increased with increase in crack depth, depending upon the aspect ratio of the surface crack, magnitude of the applied stress and notch root radius. The parameter R_W was proposed, so that J/J′ could be expressed by a unique curve as a function of R_W over quite wide ranges of notch root radius, surface-crack shape and magnitude of stress. The application limit of the simple J-integral estimation proposed earlier was assessed using this curve. The crack growth rates obtained from fatigue tests of notched specimen were successfully plotted against J-integral range calculated using the modified conventional equation.
- 一般社団法人日本機械学会の論文
- 1997-07-15
著者
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OHGI Junji
Department of Mechanical Engineering, Yamaguchi University
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Ohgi J
Yamaguchi Univ. Ube Jpn
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Ohgi Junji
Department Of Mechanical Engineering Yamaguchi University
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Hatanaka Kenji
Department Of Biomaterials Okayama University Graduate School Of Medicine Dentistry And Pharmaceutic
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Hatanaka Kenji
Department Of Mechanical Engineering Yamaguchi University
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