疲劳短裂纹理论及寿命预测方法新进展

REVIEW ON THEORY AND LIFE PREDICTION METHODS OF SHORT FATIGUE CRACKS

回顾短裂纹萌生和扩展机理、寿命预测以及短裂纹行为模拟方面的最新进展,侧重介绍疲劳短裂纹行为的统计模拟方法,马尔可夫链模型、威布尔分布函数、群体疲劳短裂纹的蒙特卡罗模拟和分形方法,以及应用蒙特卡罗方法及分形方法对低碳钢高温低周疲劳短裂纹行为所进行的模拟。对于基于BP(back propagation)神经网络的统计方法在疲劳短裂纹方面的应用也给予一定的介绍。

The latest improvements on the initiation and propagation mechanism of the short fatigue cracks, life evaluation and short fatigue crack behavior simulation were reviewed. The statistical simulation methods of short fatigue crack behavior, including Markov Chain model, Weibull function method, Monte Carlo method and fractal method were discussed emphatically, and also short fatigue crack behavior simulation results of low carbon steel at high temperature under low cycle fatigue based on Monte Carlo method and fractal method separately were given. The application of statistical method based on BPANNs （back propagation artificial neural networks） simulation was also briefly introduced.