In the issue of significant prediction deviations in fatigue crack predictions, the parameter uncertainties are usually neglected. To deal with this drawback, this paper proposes a crack growth evaluation method which takes parameter uncertainties into account to predict crack fatigue life. Firstly, the life model of crack growth is established through the combination of extended finite element method (XFEM) and Paris law. Then, the particle filter (PF) is used to reduce the uncertainty of material parameters through the actual monitoring data, and the material parameters in Paris law are estimated. Finally, the updated material parameters are put into the crack growth model for calculation, enabling a more accurate prediction of fatigue crack life. The feasibility of the proposed method is verified by two numerical examples, and the analysis results show that the proposed method can predict the fatigue crack growth life accurately.

中文翻译：

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基于扩展有限元和粒子滤波组合法的裂纹扩展评估


在疲劳裂纹预测中存在显著预测偏差的问题中，参数不确定性通常被忽略。针对这一缺点，本文提出了一种考虑参数不确定性的裂纹扩展评估方法，以预测裂纹疲劳寿命。首先，通过扩展有限元法 （XFEM） 和巴黎定律的结合建立裂纹扩展的寿命模型;然后，利用颗粒过滤器 （PF） 通过实际监测数据降低材料参数的不确定性，并估计巴黎法律中的材料参数。最后，将更新的材料参数放入裂纹扩展模型中进行计算，从而能够更准确地预测疲劳裂纹寿命。通过两个数值算例验证了所提方法的可行性，分析结果表明，所提方法能够准确预测疲劳裂纹扩展寿命。