例17 铝板焊接温度场分析实例—多层多道焊.doc

例17 铝板焊接温度场分析实例多层多道焊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MAINMESH GENERATION NODES:ADD (创建4个节点) 0 0 00.05 0 00.05 0.05 00 0.05 0 ELEMENTS:ADD (用上述4个节点创建单元) 1 2 3 4 END LIST# SUBDIVIDE (进行网格划分，采用疏密网格过渡) DIVISIONS20 20 1 BIAS FACTORS 0.35 0 0 ELEMENTS ALL:EXISTING RETURN EXPAND TRANSLATIONS0 0 -0.001 RPETITIONS 10 ELEMENTS ALL:EXISTING RETURN （创建的网格模型如下图） SWEEP ALL RENUMBER ALL SELECT ELEMENTS:STORE filler OK (选中图中所示的绿色区域) ALL:SELECT SELECT SET: filler MAKE INVISIBLE ELEMENTS:STORE solid OK ALL:VISIBLE17.3 施加材料性能MATERIAL PROPERTIES NEW (定义母材和填充材料的材料性质) ISOTROPIC YOUNGS MODULOUS 69e9 POSISONS RATIO 0.33 MASS DENSITY 2700 PLASTICITY ELASTIC-PLASTIC INITIAL YIELD STRESS 8e8 THERMAL.EXP COEFFICIENT 23.1e-6 OK HEAT TRANSFER CONDUCTIVITY 240 SPECIFIC HEAT 880 MASS DENSITY 2700 OK ELEMENTS:ADD ALL:EXISTING RETURN17.4 建立焊接路径和焊道MODELING TOOLS WEID FILLER (选定填充材料) NEW NAME:weldfiller1 (定义填充材料1，为恒温热源) PARAMETERS: MELT POINT TEMP: 660 ELEMENTS: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:weldfiller2 PARAMETERS: MELT POINT TEMP: 660 ELEMENTS: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:weldfiller3 ELEMENTS:ADD (选定图中所示的黄色单元) END LIST# RETURN WELD PATHS （创建焊接路径） NEW （定义焊接路径1） SELECTSELECT SET: weldfiller1 MAKE INVISIBLE PATH INPUT:NODES NODES:ADD 选中图示中最上面的2个节点 END LIST# ORIENTATION INPUT METHOD NODES: 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2，3 RETURN17.5 设置焊道和母材的接触关系 CONTACTCONTACT BODIESNEW NAME:filler1 DEFORMABLE OKELEMENTS:ADD SET filler1OKALL:SELECT END LIST# NEW NAME:filler2 DEFORMABLE OKELEMENTS:ADD SET filler2OKALL:SELECT END LIST# NEW NAME:filler3 DEFORMABLE OKELEMENTS:ADD SET filler3OKALL:SELECT END LIST# NEW NAME:solid DEFORMABLE OKELEMENTS:ADD SET solidOKALL:SELECT END LIST# (接触体如图所示) CONTACT TABLES NEW PROPERTIES FIRST 1:2 CONTACT TYPE:GLUE THERMAL PROPERTIES: CONTACT HEAT TRANSFER COEFFICIENT: 1e6 OK RETURN RETUEN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 CONDITIONS NEW NAME:flux1 (指定焊接热源为体热源) BOUNDARY CONDITIONS TYPE THERMAL:MORE VOLUME WELD FLUX FLUX (on) DIMENSIONS: (定义焊缝的尺寸) WIDTH:0.006 DEPTH:0.006 FORWARD LENGTH:0.004 REAR LENGTH:0.01 MOTION PARAMETER: （指定热源的运动参数） VELOCITY:0.0025 WELD PATH:weldpath1 WELD FILLER:weldfiller1 OKELEMENTS:ADD ALL:EXISTING END 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 FLUX FLUX(on) MAGNITUDE POWER 3000 EFFICIENCY 0.7 DIMENSIONS: (定义焊缝的尺寸) WIDTH:0.008 DEPTH:0.008 FORWARD LENGTH:0.005 REAR LENGTH:0.012 MOTION PARAMETER: （指定热源的运动参数） VELOCITY:0.0025 WELD PATH:weldpath3 WELD FILLER:weldfiller3 OKELEMENTS:ADD ALL:EXISTING END LIST# RETURN NEW NAME:film (指定与外界的对流交换) BOUNDARY CONDITIONS TYPE THERMAL:FACE FILM FILM COEFFICIENT:20 SINK TEMPERATYRE:60 OKFACES: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）NEWNAME:fix_xyMACHANICAL FIXED DISPLACEMENT ON X DISPLACEMENT ON Y DISPLACEMENT OKNODES:ADD (选择左端的所有节点)END LIST(#)NEWNAME:fix_zMACHANICAL FIXED DISPLACEMENT ON Z DISPLACEMENT OKNODES:ADD (选择底边上的所有端点)END LIST(#)17.7 定义工况 LOADCASES NEW COUPLED QUASI-STATIC (定义载荷工况1,焊接过程) LOADS:flux1(on) film(on) fix_xy(on) fix_z(on) OK CONTACT CONTACT TABLE:ctable1 OK CONVERGENCE TESTINGMAX ERROR IN TEMPERATURE ESTIMATE:50 OK TOTAL LOADCASES TIME: 20 FIXED:CONSTANT TIME STEP: PARAMETER: #STEP: 50 OK OK同样的方法定义载荷工况2，3 NEW COUPLED QUASI-STATIC (定义载荷工况4，焊后的冷却过程) LOADS:film(on) fix_xy(on) fix_z(on) OKCONTACT CONTACT TABLE:ctable1 OKCONVERGENCE TESTINGMAX ERROR IN TEMPERATURE ESTIMATE:50 OKTOTAL LOADCASES TIME: 500 ADAPTIVE:TEMPERATURE PARAMETERS: MAX # INCRENMENTS: 500 INITIAL TIME STEP: 1 OK OK17.8 定义作业JOBS NEW COUPLED SELECTED:lcases 3 lcases 1 lcases 2 lcases 4INITIAL LOADS: flux3(on) film(on) fix_xy(on) fix_z(on) CONTACT CONTROL INITIAL CONTACT CONTACT TABLE:ctable1 OK JOB