基于子结构RESOLVE扩展方法的三维焊接残余应力数值模拟

Numerical simulation of 3D welding residual stress with sub-structuring technology

针对三维焊接残余应力与变形数值模拟过程所需的计算时间、所需磁盘空间及精度问题,本文先计算焊接动态温度场,再运用子结构技术进行弹塑性分析,计算三维焊接残余应力。介绍了子结构理论模型及适用条件,以T形角接试件为例,基于ANSYS12.0分别建立全结构模型与子结构模型进行三维焊接残余应力数值模拟,并且在子结构模型中采用2种不同的扩展方法计算。结果表明,运用子结构技术直接扩展计算残余应力与变形可明显缩短计算时间与磁盘空间,并且通过合理选择子结构区和RESOLVE扩展方法可达到与全结构计算结果非常接近。

For calculation time,much disk space and accuracy issue of the 3D welding residual stress and deformation numerical simulation,sub-structuring technology by direct expansion method was used to calculate welding residual stress and deformation after welding temperature field calculation.Firstly,the sub-structuring theory model and application conditions were introduced in this paper,then T-joint fillet specimens were taken as an example,establishing whole structure model and sub-structuring model based on ANSYS12.0,and using two different expansion methods to calculate welding residual stress.The results showed that the use of substructuring technology could largely reduce calculating time and disk space,and comparing to the full-structure calculation,very closed results could be achieved while choosing reasonable expansion region and sub-structuring expansion method.