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Fatigue life estimation of the weld joint in K-node of the offshore jacket structure using stochastic finite element analysis
Marine Structures ( IF 3.9 ) Pub Date : 2021-05-08 , DOI: 10.1016/j.marstruc.2021.103020
Mikkel Løvenskjold Larsen , Vikas Arora , Marie Lützen , Ronnie Refstrup Pedersen , Eric Putnam

Several methods for finite element modelling and analysis of tubular welded joints are described in various design codes. These codes provide specific recommendations for modelling of the welded joints, using simple weld geometries. In this paper, experimental strain range results from two full-scale semi-automatically welded K-nodes tests are compared to corresponding finite element models. Three dimensional (3D) scans of the weld surfaces have been developed for the automatically welded K-joints. These 3D scans are included in the finite element (FE) models to determine the accuracy of the FE models. Some discrepancies are observed between finite element predictions and test results. Finite element model updating has been applied to improve the accuracy of the developed finite element models. The results are compared to a FE model with a simple weld geometry based on common offshore design codes and a FE model without any modelled weld. The results show that the FE model with 3D scanned welds are more accurate than the other FE models. The precise location of weld toe in the 3D scanned weld is difficult to locate in the FE model, thus stochastic finite element modelling is performed to analyse the probabilistic hot-spot stresses. The results show large variations in the hot-spot stresses. It can be concluded that it is necessary to evaluate the probabilistic nature of stresses for calculating fatigue lives of welded tubular joints in offshore structures.



中文翻译:

基于随机有限元分析的海上套管结构K节点焊接接头疲劳寿命估算

在各种设计规范中介绍了几种用于管状焊接接头的有限元建模和分析的方法。这些规范为使用简单焊接几何形状的焊接接头建模提供了具体建议。在本文中,将两次全尺寸半自动焊接K节点试验的实验应变范围与相应的有限元模型进行了比较。已经为自动焊接的K型接头开发了焊接表面的三维(3D)扫描。这些3D扫描包含在有限元(FE)模型中,以确定FE模型的准确性。在有限元预测和测试结果之间观察到一些差异。有限元模型更新已被应用来提高所开发的有限元模型的准确性。将结果与基于通用海上设计规范的具有简单焊缝几何形状的有限元模型和没有任何建模焊缝的有限元模型进行比较。结果表明,带有3D扫描焊缝的有限元模型比其他有限元模型更准确。在3D扫描焊缝中焊趾的精确位置很难在FE模型中定位,因此执行了随机有限元建模来分析概率性热点应力。结果表明,热点应力变化很大。可以得出结论,有必要评估应力的概率性质,以计算海上结构中焊接管状接头的疲劳寿命。结果表明,带有3D扫描焊缝的有限元模型比其他有限元模型更准确。在3D扫描焊缝中焊趾的精确位置很难在FE模型中定位,因此执行了随机有限元建模来分析概率性热点应力。结果表明,热点应力变化很大。可以得出结论,有必要评估应力的概率性质,以计算海上结构中焊接管状接头的疲劳寿命。结果表明,带有3D扫描焊缝的有限元模型比其他有限元模型更准确。在3D扫描焊缝中焊趾的精确位置很难在FE模型中定位,因此执行了随机有限元建模来分析概率性热点应力。结果表明,热点应力变化很大。可以得出结论,有必要评估应力的概率性质,以计算海上结构中焊接管状接头的疲劳寿命。

更新日期:2021-05-08
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