進展抵抗の不規則性による疲労き裂進展寿命のばらつきを支配するパラメータの推定法

概要

論文の詳細を見る
It is widely recognized that considerable scatter is often observed in fatigue crack growth rate data. The primary source of this scatter is material inhomogeneity which causes the variability of material's resistance against fatigue crack growth along the path of the crack, and hence the statistical properties of the distribution of crack propagation fatigue life due to random crack propagation resistance are often needed in structural reliability analysis. From this point of view, Ishikawa et al. showed a stochastic fatigue crack growth model based on a Markov approximation method, and derived the theoretical crack propagation life distribution from it. But there has been no way to estimate the one unknown parameter which appears in their solution. In this paper, a simplified method to estimate that unknown parameter is proposed. Monte-Carlo simulation is also performed to confirm the proposed method, and satisfactory results are obtained.
一般社団法人日本機械学会の論文
1993-01-25