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首页> 外文期刊>International Journal of Fatigue >Application and comparison of deterministic and stochastic methods for the evaluation of welded components' fatigue lifetime based on real notch stresses
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Application and comparison of deterministic and stochastic methods for the evaluation of welded components' fatigue lifetime based on real notch stresses

机译：确定性和随机性方法在基于真实缺口应力的焊接部件疲劳寿命评估中的应用与比较

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摘要

This paper presents two advanced methods for modelling the fatigue lifetime of welded components with an irregular distributed geometry and compares the results achieved. The first approach, applies a deterministic method in order to analyse implicit gradient models, whereas the second one examines a Weibull-based model using a stochastic method. Both models can be combined in order to encompass the stress gradient and the statistical size effect.In order to determine the parameters for both models, an examination of specimens from five different test series with different macro-geometries and from different test laboratories is performed. After measuring the geometry of the welded components using a laser scanning system with high accuracy and resolution, the linear-elastic notch stresses on the real geometries of each specimen are calculated using FEM. Effective stresses are calculated with different parameters using the implicit gradient model. These notch stresses and effective stresses are used as input parameters for a Weibull-based method to model the crack initiation phase. This initiation phase includes cracks with a length of 3-5 mm.Both methods can be applied on a standalone basis or in combination. However, it has been observed that either combining the two methods or using exclusively the implicit gradient model other than the Weibull model leads to no better results.
机译：本文提出了两种先进的方法来对具有不规则分布几何形状的焊接部件的疲劳寿命进行建模，并比较所获得的结果。第一种方法采用确定性方法来分析隐式梯度模型，而第二种方法则使用随机方法检查基于Weibull的模型。为了涵盖应力梯度和统计尺寸效应，可以将这两个模型组合在一起。为了确定两个模型的参数，将对来自具有不同宏观几何形状的五个不同测试系列以及来自不同测试实验室的样本进行检查。在使用具有高精度和高分辨率的激光扫描系统测量焊接部件的几何形状之后，使用FEM计算每个试样的真实几何形状上的线性弹性缺口应力。使用隐式梯度模型，通过不同的参数计算有效应力。这些缺口应力和有效应力用作基于Weibull的方法的输入参数，以模拟裂纹萌生阶段。初始阶段包括3-5 mm的裂纹，两种方法均可单独使用或组合使用。但是，已经观察到，将两种方法结合使用或仅使用除Weibull模型以外的隐式梯度模型都不会导致更好的结果。

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