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Fatigue life estimation of the weld joint in K-node of the offshore jacket structure using stochastic finite element analysis

机译：利用随机有限元分析疲劳寿命估算近海夹套结构K节点的焊接接头

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摘要

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.
机译：各种设计代码描述了几种用于有限元建模和分析管状焊接接头的方法。这些代码使用简单的焊接几何形状提供了用于建模焊接接头的具体建议。在本文中，将两个全尺寸半自动焊接K节点测试的实验应变范围与相应的有限元模型进行比较。已经开发了焊接表面的三维（3D）扫描用于自动焊接的k关节。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。有限元预测和测试结果之间观察到一些差异。有限元模型更新已应用于提高开发有限元模型的准确性。将结果与FE模型进行比较，其具有基于公共海上设计代码和FE模型的简单焊接几何形状，无需任何建模焊缝。结果表明，3D扫描焊缝的FE模型比其他FE模型更准确。在Fe模型中难以定位3D扫描焊缝中焊接脚趾的精确定位，从而进行随机有限元建模以分析概率的热点应力。结果显示出热点应力的大变化。可以得出结论，有必要评估近海结构中焊接管状关节的疲劳寿命的应力的概率性质。

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