搅拌摩擦焊接数值模拟的网格敏感性分析  

Mesh sensitivity analysis in the simulation of friction stir welding

作　　者：刘亚丽[1] 张昭[1] 陈金涛[1] 张洪武[1] 

机构地区：[1]大连理工大学运载工程与力学学部工程力学系工业装备结构分析国家重点实验室,大连116024

出　　处：《计算力学学报》2012年第1期140-145,共6页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(10802017);国家973计划(2010CB832704)资助项目

摘　　要：利用完全热力耦合模型,通过对具有不同网格尺寸的焊接构件有限元模型的计算,分析了网格敏感性对模拟结果的影响,同时简要分析了焊接过程中温度分布和残余应力大小及分布形式。数值结果表明,网格密度影响计算误差,同时决定着计算效率和计算成本。随着网格密度的增加,计算结果的精度得到提高,当网格加密到一定程度,计算结果的精度并没有随着网格密度的增加成比例的增加。焊接过程中温度近似呈稳态分布,焊接构件的纵向残余应力分布呈现典型双峰特征,这些现象都与已有试验所得结论吻合。Fully coupled thermo-mechanical models with different sizes are developed to study the effect of the mesh sensitivity on the computational results. The temperature distribution and the residual stress distribution are also studied. The result indicates that computational error, efficiency and cost are all depending on the mesh density. Accuracy is enhanced with the increase of mesh density. However, accuracy is not proportional to the increase of the mesh density. Temperature distribution is almost steady in the welding process. Additionally,the longitudinal distribution of residual stress in the welding plate reveals the double peak feature,which can correlate well with the previous experiments.

关 键 词：搅拌摩擦焊接 完全热力耦合模型 网格敏感性 残余应力 温度分布 

分 类 号：TG404[金属学及工艺—焊接] O242.21[理学—计算数学]