对流换热系数对厚板焊接残余应力应变研究-光谱学与光谱分析-重庆.PDF

第36卷第11期摇 摇 摇 摇 摇 摇 摇 摇 重庆 交通 大 学学报(自然科 学版)摇 摇 摇 摇 摇 摇 摇 Vol.36摇 No.11 2017 年11月摇 摇 摇 摇 摇 JOURNALOFCHONGQINGJIAOTONGUNIVERSITY(NATURALSCIENCE)摇 摇 摇 摇 摇 Nov.2017摇 摇 摇 DOI:10郾3969/ j.issn.1674鄄0696郾2017郾11郾02 对流换热系数对厚板焊接残余应力应变研究 何雄君,何江源 (武汉理工大学 交通运输学院,湖北 武汉430060) 摘要:主要考察了对流换热系数对厚板对接焊残余应力应变的影响,从而对现有的重要焊接构件(如桥梁大型锚拉 板)的冷却方式给出参考,利用ABAQUS软件对焊接构件进行有限元模拟计算,通过改变对流换热系数数值大小来 模拟冷却速度对厚板焊接残余应力应变的影响。 研究表明:焊接区在不同冷却速度下计算结果没有数量级的差异, 并且发现对流换热系数与构件焊后残余应力应变的影响也并非为单调线性的关系,在某一适中的对流换热系数条 件下,厚板焊接的残余应力应变可以达到最小。 关摇 键摇 词:桥梁工程;焊接;对流换热系数;残余应力应变;X坡口平板对焊;生死单元 + 中图分类号:U441 .5;TG40 文献标志码:A 文章编号:1674鄄0696(2017)11鄄007鄄04 Residual Stress and Strain of Convective Heat Transfer Coefficient on Thick Plate Welding HE Xiongjun,HE Jiangyuan (School of Transportation,Wuhan University of Technology,Wuhan430060,Hubei,P.R.China) Abstract:The impact of convective heat transfer coefficient on the residual stress and strain of butt weldingwas mainly in鄄 vestigated. Therefore,thereferenceforthecoolingmethodoftheexistingimportantweldingcomponents (suchasthebridge large tensile anchor plate) was given. The finite element simulation calculation of the welding parts was carried out by ABAQUS software,and the numerical value of convective heat transfer coefficient was changed to simulate the impact of cooling speed on residual stress and strain of thick plate welding. The research shows that:the calculation results of the welding zonewith different cooling speed have no difference in magnitude,and it is also found that the influence of the convective heat transfer coefficient on the residual stress and strain of the component after welding is not monotonous linear relationship. In a moderate condition of convective heat transfer coefficie