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1、例例 17 铝板焊接温度场分析实例铝板焊接温度场分析实例多层多道焊多层多道焊17.1 问题描述模拟一块铝合金板材多层多道焊接过程。17.2 建立有限元模型MAIN MESH GENERATION NODES:ADD (创建 4 个节点) 00 0 0.050 0 0.050.05 0 00.05 0ELEMENTS:ADD (用上述 4 个节点创建单元) 12 3 4END LIST# SUBDIVIDE (进行网格划分，采用疏密网格过渡)DIVISIONS 2020 1BIAS FACTORS 0.350 0ELEMENTSALL:EXISTINGRETURNEXPANDTRANSLATIO
2、NS 00 -0.001RPETITIONS 10ELEMENTSALL:EXISTING RETURN （创建的网格模型如下图）SWEEPALLRENUMBERALLSELECTELEMENTS:STOREfiller OK(选中图中所示的 绿色区域)ALL:SELECTSELECT SET: fillerMAKE INVISIBLEELEMENTS:STOREsolid OKALL:VISIBLE17.3 施加材料性能MATERIAL PROPERTIESNEW (定义母材和填充材料的材料性质)ISOTROPICYOUNGS MODULOUS 69e9POSISONS RATIO 0.33
3、MASS DENSITY 2700PLASTICITYELASTIC-PLASTICINITIAL YIELD STRESS 8e8THERMAL.EXPCOEFFICIENT 23.1e-6OKHEAT TRANSFERCONDUCTIVITY 240SPECIFIC HEAT 880MASS DENSITY 2700OKELEMENTS:ADDALL:EXISTINGRETURN17.4 建立焊接路径和焊道MODELING TOOLSWEID FILLER (选定填充材料) NEWNAME:weldfiller1 (定义填充材料 1，为恒温热源)PARAMETERS:MELT POINT
4、TEMP: 660ELEMENTS:ADD (选定图中所示的粉色单元)END LIST#NEW （定义填充材料 2，为恒温热源）NAME:weldfiller2PARAMETERS:MELT POINT TEMP: 660ELEMENTS:ADD (选定图中所示的橙色单元)END LIST#NEW （定义填充材料 3，为恒热流密度源）NAME:weldfiller3ELEMENTS:ADD (选定图中所示的黄色单元)END LIST#RETURNWELD PATHS （创建焊接路径）NEW （定义焊接路径 1）SELECT SELECT SET: weldfiller1MAKE INVISIB
5、LEPATH INPUT:NODESNODES:ADD选中图示中最上面的 2 个节点END LIST#ORIENTATION INPUT METHODNODES: ADD选中图示中的最下面的那个点END LIST# 同样的方法定义焊接路径 2，3RETURN17.5 设置焊道和母材的接触关系CONTACT CONTACT BODIES NEWNAME:filler1DEFORMABLEOK ELEMENTS:ADD SET filler1 OK ALL:SELECTEND LIST#NEWNAME:filler2DEFORMABLEOK ELEMENTS:ADD SET filler2 OK
6、ALL:SELECTEND LIST#NEWNAME:filler3DEFORMABLEOK ELEMENTS:ADD SET filler3 OK ALL:SELECTEND LIST#NEWNAME:solidDEFORMABLEOK ELEMENTS:ADD SET solid OK ALL:SELECTEND LIST# (接触体如图所示)CONTACT TABLESNEWPROPERTIESFIRST 1:2CONTACT TYPE:GLUETHERMAL PROPERTIES:CONTACT HEAT TRANSFER COEFFICIENT: 1e6OKRETURNRETUEN
7、同样的操作定于接触体 1 与 3，1 与 4，2 与 3，3 与 4 之间的接触关系17.6 设置边界条件BOUNDARY CONDITIONSNEW NAME:flux1 (指定焊接热源为体热源)BOUNDARY CONDITIONS TYPETHERMAL:MOREVOLUME WELD FLUXFLUX (on)DIMENSIONS: (定义焊缝的尺寸) WIDTH:0.006DEPTH:0.006FORWARD LENGTH:0.004REAR LENGTH:0.01MOTION PARAMETER: （指定热源的运动参数）VELOCITY:0.0025WELD PATH:weldpa
8、th1WELD FILLER:weldfiller1OKELEMENTS:ADDALL:EXISTINGEND LIST#RETURN 同样的条件定义焊接热源 2NEW NAME:flux3 (指定焊接热源为体热源)VOLUME WELD FLUXFLUX(on)MAGNITUDE POWER 3000EFFICIENCY 0.7DIMENSIONS: (定义焊缝的尺寸) WIDTH:0.008DEPTH:0.008FORWARD LENGTH:0.005REAR LENGTH:0.012MOTION PARAMETER: （指定热源的运动参数）VELOCITY:0.0025WELD PATH
9、:weldpath3WELD FILLER:weldfiller3OKELEMENTS:ADDALL:EXISTINGEND LIST#RETURN NEW NAME:film (指定与外界的对流交换)BOUNDARY CONDITIONS TYPETHERMAL:FACE FILMFILMCOEFFICIENT:20SINK TEMPERATYRE:60OKFACES:ADD选定除填充材料以外的表面END LIST#RETURN （与外界热交换的边界条件如下图）NEW NAME:fix_xy MACHANICALFIXED DISPLACEMENTON X DISPLACEMENTON Y
10、DISPLACEMENTOK NODES:ADD (选择左端的所有节点) END LIST(#)NEW NAME:fix_z MACHANICALFIXED DISPLACEMENTON Z DISPLACEMENTOK NODES:ADD (选择底边上的所有端点) END LIST(#)17.7 定义工况 LOADCASESNEWCOUPLEDQUASI-STATIC (定义载荷工况 1,焊接过程)LOADS:flux1(on)film(on)fix_xy(on)fix_z(on)OKCONTACTCONTACT TABLE:ctable1OKCONVERGENCE TESTING MAX
11、ERROR IN TEMPERATURE ESTIMATE:50OKTOTAL LOADCASES TIME: 20FIXED:CONSTANT TIME STEP:PARAMETER:#STEP: 50OKOK同样的方法定义载荷工况 2，3 NEWCOUPLEDQUASI-STATIC (定义载荷工况 4，焊后的冷却过程)LOADS:film(on)fix_xy(on)fix_z(on)OKCONTACTCONTACT TABLE:ctable1OK CONVERGENCE TESTING MAX ERROR IN TEMPERATURE ESTIMATE:50OK TOTAL LOADCA
12、SES TIME: 500ADAPTIVE:TEMPERATUREPARAMETERS:MAX # INCRENMENTS: 500INITIAL TIME STEP: 1OKOK17.8 定义作业JOBS NEWCOUPLEDSELECTED:lcases 3lcases 1lcases 2lcases 4INITIAL LOADS: flux3(on)film(on)fix_xy(on)fix_z(on)CONTACT CONTROLINITIAL CONTACTCONTACT TABLE:ctable1OKJOB RESULTSStress(on)Equivalent Von Mises Stress(on)Total Equivalent Plastic Strain(on)OKOK ELEMENT TYPECOUPLED3-D SOLID:117 OKALL:EXISTINGCHECKRUN17.9 温度场结果分析第一层焊缝的温度场焊接第二层第一道的温度场第二层第二道的温度场
