12. Cyclic Local Strain Range for Fatigue Life Estimation of Notched Plate

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Many studies have been made on the application of results of fatigue tests on small smooth specimens to evaluate the fatigue life in structural members on the basis of the estimated strain behavior in stress-concerntrated regions. This procedure is called the hot spot strain concept and has been adopted in some design rules. In this method, the problem is how to accurately estimate the elastic-plastic behavior of local stress or strain. If the behavior is obtained by experiment or elastic-plastic analysis on each structural member, it is very expensive. Most of the estimation formulas for strain behavior so far proposed have been derived from analyses under monotonically increasing loads. In order to evaluate the fatigue life, however, it is more desirable to know the cyclic local strain range rather than the monotonic strain behavior. In this study, therefore, the attempt was to establish a simple method to estimate the local strain range under cyclic loading. Namely, elastic-plastic analyses under cyclic loading were conducted on notched plates, and an investigation was made into the effects of applied stress conditions, stress concentration factors, and material properties on the local strain range. As a result, the formulas for estimating the shakedown limit and cyclic local strain range were derived. A comparison was made between some results of fatigue tests on notched plates so far published and the fatigue life estimated using the formulas proposed in this study. Although the scatter band in the relationship between the estimated and measured fatigue life is rather wide, it was concluded that the method proposed can be used to estimate well the fatigue lives in the wide range of 10^2〜5・10^6 cycles in notched steel plates of 41〜80kgf/mm^2 strength levels.
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12. Cyclic Local Strain Range for Fatigue Life Estimation of Notched Plate

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