应用固有应变法计算焊接变形时材料模型的选择研究

分别采用理想弹塑性模型和双线性强化模型,推导出各自的固有应变计算公式,研究不同材料模型对于焊接结构变形的影响。研究结果表明,两种固有应变计算公式所预测的变形结果之间相对误差较小,即不同材料模型的选择对预测结构焊接变形的影响可以忽略。

Research on the selection of material model in the calculation of welding deformation by inherent strain method

Inherent strain method is usually used in the prediction of large structure welding deformation. In this method, inherent strain formulas deduced by different material models are diffierent, which will lead to different calculation reasults of welding deformation. Here the ideal elastic-plastic model and bilinear hardening model are adopted separately to deduce inherent strain formulas in this paper, and the influence of different material models on deformation of welded structure is also studied. The results show that the relative error of the deformation results predicted by two kinds of inherent strain formula is small. In other words, the influence of different material models on the prediction of welding deformation can be negligible.