疲労き裂進展の破面解析におけるモンテカルロ・シミュレーションの応用

概要

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This paper presents a new method Monte Carlo simulation to estimate the life distribution of fatigue crack propagation on the basis of crack length vs. striation-spacing data measured by a SEM on a fatigue fracture surface. This method considers the distributions of two parameter estimates of a regression line and the correlation of the two parameter estimates. One cycle of the Monte Carlo scheme generates a set of estimates for the two parameters and they give a life of fatigue crack propagation. For an example, this study takes up the striation-spacing data measured on the fatigue fracture surface of the rod end housing of a hydraulic actuator used for a main landing gear in transport aircraft. The proposed method and the other two methods, which use a deterministic slope and the distribution of intercept estimates in a linear regression model, provide the distribution of fatigue crack propagation. The calculated results are discussed and compared. The proposed method approximately predicts the fatigue life of the rod end housing as the B allowable life when the initial crack length is assumed to be zero mm.
社団法人日本材料学会の論文
1994-10-15