Abstract

In the present study, different finite element (FE) models were prepared to investigate weld induced residual stresses in thick multi-pass butt welded joint of SA516 Gr. 70 plates. Both 3D and 2D full geometry models and their axisymmetric half models were taken into consideration. The competence of these FE models on the accuracy of predicting residual stress distribution across the weld cross-section was investigated by comparing it with the experimental results. Blind hole drilling technique and deep hole drilling technique were employed to evaluate the surface and through-thickness residual stress distributions, respectively. In addition, the change in volume and yield strength of weld material due to austenitic phase transformation was also incorporated in the material modeling to observe the effect of solid-state phase transformation (SSPT) on the evaluation of residual stresses. Computed residual stresses obtained from different FE models indicate that the 3D FE models procured the best accuracy compared with the experimental results. On the other hand, 2D models can save a significant amount of computational time with reasonable accuracy. Incorporation of SSPT in the 3D FE full model exhibited a better agreement of predicted results with the experimental measurements.

Graphic Abstract

中文翻译：

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有限元模型和固态相变对焊接残余应力评估的意义

摘要

在本研究中，准备了不同的有限元（FE）模型来研究SA516 Gr的厚多道对接焊缝中焊接引起的残余应力。70个盘子。3D和2D完整几何模型及其轴对称半模型都已考虑在内。通过与实验结果进行比较，研究了这些有限元模型在预测焊缝横截面残余应力分布的准确性上的能力。分别采用盲孔钻技术和深孔钻技术评估了表面残余应力和整个厚度残余应力的分布。此外，焊接材料的体积和屈服强度的变化（由于奥氏体相变）也被纳入到材料模型中，以观察固态相变（SSPT）对残余应力评估的影响。从不同的有限元模型获得的计算的残余应力表明，与实验结果相比，3D有限元模型获得了最佳的精度。另一方面，二维模型可以以合理的精度节省大量计算时间。在3D FE完整模型中并入SSPT表现出与实验测量结果更好的预测结果一致性。另一方面，二维模型可以以合理的精度节省大量计算时间。在3D FE完整模型中并入SSPT表现出与实验测量结果更好的预测结果一致性。另一方面，二维模型可以以合理的精度节省大量计算时间。在3D FE完整模型中并入SSPT表现出与实验测量结果更好的预测结果一致性。

图形摘要