확률적 피로한도모형하에서 계단형 피로시험의 설계
Design of the Staircase Fatigue Tests for the Random Fatigue Limit Model
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Abstract
The fatigue has been considered the most failure mode of metal, ceramic, and composite materials. In this paper, numerical experiments to asses the usefulness of two Dixon’s methods (small and large samples) and 14 S-N methods on assumptions of lognormal fatigue limit distribution under RFL (Random Fatigue Limit) model are conducted for staircase (or up-and-down) test and compared by MSE (Mean Squared Error) and bias for estimates of mean log-fatigue limit. Also, guidelines for staircase test plans to choose initial stress level and step size are recommended from numerical experiments including sensitivity analyses. In addition, the parametric bootstrap method to construct a confidence interval for the mean of log-fatigue limit by the percentile method using a transition probability matrix of Markov chain is presented and illustrated with an example.
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