Monte Carlo Simulation Taking Account of Surface Crack Effect for Stress Corrosion Cracking in a Stainless Steel SUS 304

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  • ステンレス鋼ＳＵＳ３０４における応力腐食割れの表面き裂効果を考慮したモンテカルロ・シミュレーション
  • ステンレスコウ SUS304 ニ オケル オウリョク フショク ワレ ノ ヒョウメン キレツ コウカ オ コウリョシタ モンテカルロ シミュレーション

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Abstract

Stress corrosion cracking (SCC) in structural metal materials occurs by initiation and coalescence of micro cracks, subcritical crack propagation and multiple large crack formation or final failure under the combination of materials, stress and corrosive environment. In this paper, a Monte Carlo simulation for the process of SCC has been proposed based on the stochastic properties of micro crack initiation and fracture mechanics concept for crack coalescence and propagation. The emphasis in the model is put on the influence of semi-elliptical surface cracks. Numerical simulations are carried out based on CBB (creviced bent beam) test results of a sensitized stainless steel SUS 304 and the influence of micro crack initiation rate and coalescence condition on the simulation results is discussed. The numerical examples indicate the applicability of the present model to a prediction of the SCC behavior in real structures.

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