Reliability-Based Consideration of ASME's Scatter Factor Used in Low-Cycle Fatigue Design Based on Geometrically Similar Model Tests

概要

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In the low-cycle fatigue design based on testing of geometrically similar models, the scatter of fatigue life is taken into account using the factor for the statistical variation in test results, K_<ss> = 1.470-0.044γ, the formula given by the ASME Boiler and Pressure Vessel Code, where γ is the number of replicate test. In the present paper, this formula has been examined by calculating the upper confidence limit of the probability of failure P_<fU> for the design service cycles as determined using the above formula. It was found that P_<fU> varied with η and γ, where η was the coefficient of variation of the fatigue life. An alternative formula was proposed which made P_<fU> independent of η and γ.
一般社団法人日本機械学会の論文
1988-01-15