振动削减铝合金焊接残余应力的细观模拟

Mesoscopic simulation of vibration reduction of residual stress in aluminum alloy welding

  • 摘要: 针对焊接残余应力,使用ABAQUS有限元软件对多组焊接工艺参数下的薄板铝合金焊接接头进行了模拟。根据不同焊接工艺参数下的焊接接头EBSD数据,分别建立宏观、细观模型,细观模型根据铝合金晶胞结构建立以滑移为主的面心立方模型计算,得到温度场与残余应力场。在此基础上使用非共振振动消减残余应力,对比宏观与不同初始晶体取向的细观模型残余应力变化,并比较了不同初始应力下晶体取向对应力消除效果的影响。结果表明,细观模型较宏观模型残余应力消减效果明显,其中晶体取向差异大的多晶模型效果应力消减程度最高,可以有效模拟纵向残余应力的消减,与试验结果契合。

     

    Abstract: In view of the welding residual stress, the finite element software ABAQUS was used to simulate the welded joint of thin sheet aluminum alloy under several groups of welding parameters. According to the EBSD data of welded joints under different welding parameters, the macroscopic model and the mesoscopic model were established respectively. In the mesoscopic model, the temperature field and residual stress field were calculated by the face-centered cubic model based on the crystal cell structure of aluminum alloy. On this basis, non-resonant vibration was used to reduce the residual stress. The changes of residual stress in the macroscopic model and the mesoscopic model with different initial crystal orientations were compared, and the influence of crystal orientations on the stress relief effect under the different initial stress was compared. Results showed that the residual stress reduction effect of the mesoscopic model was better than that of the macroscopic model. The polycrystalline model with large crystal orientation difference had the highest stress reduction effect. The mesoscopic model could effectively simulate the reduction of longitudinal residual stress, and it was in accordance with the experimental results.

     

/

返回文章
返回