疲労ホットスポット応力場に対するWilliams応力解の適用性について

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In these days, a common structural code including fatigue strength design has been proposed by international ship society, IACS, and put to practical use in structural design field. And recently designer job has surprisingly changed and advanced by remarkable development of computing abilities such as FEM stress analysis and network environments etc. However as to fatigue calculation procedures using FEM stress output in direct calculation approach, it remains some critical problems, the author thinks, in sense of theoretical background firmness and accuracy of estimation. Therefore, in order to make fatigue check procedure more closely related to the theory of stresses and to make fatigue design more logical and reliable and more better accuracy in life prediction, the author has proposed adaptation of simplified stress field near a hot spot that brings certain fixed relation between surface stress and crack driving stress. The stress field can be theoretically derived from Williams stress field solution and the relevant constants in the stress distribution equation are determined numerically by nonlinear regression analysis on FEM surface stresses output. Finally as an application example, some of basic fatigue test specimen and model test results were analyzed and compared with the observed data, and it has confirmed the effectiveness of the proposed procedure in fatigue life prediction.
独立行政法人海上技術安全研究所の論文
2012-01-31

疲労ホットスポット応力場に対するWilliams応力解の適用性について

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