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Reanalysis of offshore T-joint fatigue life predictions based on a complete weld profile model

机译:基于完整焊缝轮廓模型的海上T型接头疲劳寿命预测再分析

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摘要

A comparison between the fatigue life predictions obtained by the stress concentration factors (SCFs) of 3D solid finite element (FE) models considering the weldment and the existing SCF parametric equations for tubular T-joints, is presented in this paper. From the study carried out, it was concluded that the existing parametric equations for predicting hot spot SCFs are very conservative and insufficient to be used for optimisation. SCFs should be carried out by modelling 3D solid joints which include the weldment and should be based on notch stresses measured on the external surface at the weld toe. The Offshore and Marine Renewable Energy industry could significantly reduce their investment costs using contemporary FE models, since slight overestimations of the SCF results in a corresponding large reduction in predicted service life.
机译:本文提出了通过考虑焊接的3D实体有限元(FE)模型的应力集中因子(SCF)获得的疲劳寿命预测与现有的管状T形接头的SCF参数方程的比较。从进行的研究得出的结论是,现有的用于预测热点SCF的参数方程式非常保守,不足以用于优化。 SCF应通过对3D实体接头(包括焊件)进行建模来进行,并且应基于在焊趾外表面上测量的缺口应力。海洋和海洋可再生能源行业可以使用现代有限元模型大大降低其投资成本,因为对SCF的过高估计会导致相应的预期使用寿命大幅减少。

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