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首页> 美国政府科技报告 >Stochastic Modeling of Crack Initiation and Short-Crack Growth under Creep and Creep-Fatigue Conditions
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Stochastic Modeling of Crack Initiation and Short-Crack Growth under Creep and Creep-Fatigue Conditions

机译：蠕变和蠕变 - 疲劳条件下裂纹萌生与短裂纹扩展的随机模拟

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摘要

A simplified stochastic model is proposed for crack initiation and short-crack growth under creep and creep-fatigue conditions. Material inhomogeneity provides the random nature of crack initiation and early growth. In the model, the influence of microstructure is introduced by the variability of: (1) damage accumulation along grain boundaries, (2) critical damage required for crack initiation or growth, and (3) the grain-boundary length. The probabilities of crack initiation and growth are derived by using convolution integrals. The model is calibrated and used to predict the crack density and crack-growth rate of short cracks of 304 stainless steel under creep and creep-fatigue conditions. The mean-crack initiation lives are predicted to be within an average deviation of about 10 percent from the experimental results. The predicted cumulative distributions of crack-growth rate follow the experimental data closely. The applicability of the simplified stochastic model is discussed and the future research direction is outlined.

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