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Crack Growth-based Fatigue Life Prediction Using Spline Fictitious Boundary Element Method

机译：基于样条虚拟边界元方法的基于裂纹扩展的疲劳寿命预测

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摘要

Fatigue life prediction is of great importance to the design and maintenance of structural components.A boundary element method (BEM)-based approach is proposed in this paper for fatigue life prediction using crack growth analysis.The proposed methodology is based on the well-known Paris equation for fatigue crack growth rate,which is related to the amplitude of the stress intensity factor (SIF) as a crack grows.The SIF is determined by the fracture spline fictitious boundary element method (SFBEM) based on the Erdogan fundamental solutions for plane cracked problems.The fusion of SFBEM and the Erdogan fundamental solutions is computationally efficient and provides a powerful tool for crack growth-based fatigue life prediction.A numerical example based on the mode-I crack problem is presented to validate the present method.The results show that the predicted fatigue life obtained by the present approach is accurate in comparison with the analytic solution.
机译：疲劳寿命预测对于结构部件的设计和维护非常重要。本文提出了一种基于边界元方法（BEM）的基于裂纹扩展分析的疲劳寿命预测方法。疲劳裂纹扩展率的Paris方程，与裂纹扩展时的应力强度因子（SIF）的幅度有关.SIF由断裂样条线虚拟边界元法（SFBEM）根据埃尔多安平面的基本解确定SFBEM和Erdogan基本解的融合计算效率高，为基于裂纹增长的疲劳寿命预测提供了强大的工具。基于I型裂纹问题的数值算例验证了该方法的有效性。结果表明，与解析解相比，通过本方法获得的预测疲劳寿命是准确的。

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