低合金鋼SNCM439における腐食疲労寿命分布のシミュレーション

概要

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A Monte Carlo simulation of corrosion fatigue life distribution has been conducted on low-alloy steel, SNCM439. In a simulation, it was assumed that fatigue life consisted of the growths of corrosion pits and fatigue cracks. The parameters used in the simulation were obtained from fatigue tests at 250 MPa. The simulated results were in good agreement with the experimental results at 250 MPa, but not with those at 100 and 400 MPa. The cause of poor agreement at 100 and 400 MPa was attributed to the stress level dependence of the growth characteristics of corrosion pits and fatigue cracks. The same simulation was applied to the results at 100 MPa using the parameters obtained from the fatigue tests at this stress level. Consequently, the experimental distribution was accurately represented by the simulation. Therefore, it was concluded that the distributions of corrosion fatigue life could be predicted by a Monte Carlo simulation taking into account the scatter in the growth processes of corrosion pits and fatigue cracks.
一般社団法人日本機械学会の論文
1992-11-25