论文部分内容阅读
重点研究不同线性单元对焊接残余应力和变形数值模拟的影响,考察各单元对数值模拟过程计算精度以及计算效率的贡献,利用有限元软件ABAQUS进行数值模拟,充分考虑模型的材料非线性和几何非线性,运用热-弹-塑性有限元间接耦合法实现焊接数值模拟全过程。通过数值模拟分析,得到基于不同线性单元类型条件下的应力分布和焊接变形,经对比分析总结出各线性单元对焊接数值模拟的影响。结果表明:不同线性单元对焊接残余应力分析影响不大,但是对于焊接变形的影响较大。与此同时,不同线性单元对数值模拟的计算效率有较大的影响,非协调模式单元耗时冗长,完全积分单元次之,减缩积分单元计算时间最短,该线性单元在保证较高分析精度的同时,能够有效缩减计算时间,提高计算效率。
The influence of different linear elements on the numerical simulation of welding residual stress and deformation is mainly studied. The contribution of each element to the calculation accuracy and calculation efficiency of the numerical simulation process is investigated. The finite element software ABAQUS is used for numerical simulation. The material nonlinearity and geometry of the model are considered Linear, using the thermo-elastic-plastic FEM indirect coupling method to achieve the whole process of numerical simulation. By numerical simulation, the stress distribution and welding deformation under different linear element types are obtained. The influence of each linear element on the numerical simulation of welding is concluded through comparative analysis. The results show that different linear elements have little effect on the analysis of welding residual stress but have a great influence on the welding deformation. At the same time, different linear elements have great influence on the computational efficiency of numerical simulation. Nonconforming elements are time-consuming and time-consuming, followed by complete integral elements and shortened integral elements. This linear element has the highest computational efficiency At the same time, it can effectively reduce the calculation time and improve the calculation efficiency.