第6章 在Patran界面中建立Dytran模型及后处理的操作过程实例6

进行动画显示。步骤如下： Insight Control （工具栏）/Animation Control/Setup/（可 以改变动画图幅数）/Animate
画出压力的时间历程。步骤如下： XY PLOT/Create/XYWindow/Enter XYWindow Name = w1 /Apply Post/Curve/Post Curves =选中 PRESSURE_ELEMENT_PRESSURE_MBIRD.curve6/Apply
在凸模几何面上创建网格种子点。步骤如下： Group/Post/选中“upper_die”/Apply Finite Elements/Create/Mesh Seed/Uniform/Number of Elements=20/Curve List=Surface 1.2 2.2 3.2 4.2 1.3 2.3 3.3 4.3/Apply /Number of Elements=10/Curve List=Curve 2 3/Apply /Number of Elements=80/Curve List=Surface 5.3 6.3/Apply
Geometry/Create/Surface/Revolve/Axis=Coord0.2/Total Angle=90/Curve List=Curve 1/Apply/Curve List=Surface 1.2/Apply/Curve List= Surface 2.2 /Apply/Curve List= Surface 3.2 /Apply Angle=360/Curve List=Curve 2 3/Apply
在PATRAN中创建凹模的几何。步骤如下： Group/Create/New Group Name=lower_die/Apply Geometry/Create/Point/XYZ/ Point Coordinate List= [51.25 -60 0]/Apply/Point Coordinate List= [51.25 -6 0]/Apply/Point Coordinate List= [56.25 -1 0]/Apply/Point Coordinate List= [105.05 -1 0]/Apply/Point Coordinate List= [56.25 -6 0]/Apply Geometry/Create/Curve/Point/2Point/Starting Point List=Point 5/Ending Point List=Point 6/Apply /Starting Point List=Point 7/Ending Point List=Point 8/Apply /2D ArcAngles/Radius=5/Start Angle=90/End Angle=180/Center Point List=Point 9/Apply
定义用于储存欧拉单元的压力、密度及耦合能的时间历程文件。 首先创建一个叫做“two_euler_elem”的组将两个分别处于两个 撞击中心点附近的欧拉单元包含进来。 Group/Create/New Group Name=alegrids/Entity Selection= 拾取两个分别处于两个撞击中心点附近的欧拉单元/Apply Analyze/Input Deck/Translate/Output Request/Result Name=pressure/File Type=Time History/Result Type=Element Output/Time for Outptu=0 thru end by 1.0E6/Add/Select Groups for Output=“two_euler_elem/Result Types=density,specific internal energy,pressure/Apply/Ok /Apply
Geometry/Create/Surface/Revolve/Axis=Coord0.2/Total Angle=360/Curve List=Curve 4 6 5/Apply
用同样的方法创建压边圈及板料的几何。步骤如下： Group/Create/New Group Name=lower_die/Apply Geometry/Create/Point/XYZ/ Point Coordinate List= [56.25 –0.5 0]/Apply/Point Coordinate List= [105.05 –0.5 0]/Apply /Curve/Point/2Point/Starting Point List=Point 10/Ending Point List=Point 11/Apply Geometry/Create/Surface/Revolve/Axis=Coord0.2/Total Angle=360/Curve List=Curve 7/Apply
划分有限元网格： Finite Elements/Create/Mesh /Surface/Quad/ISOMesh/Quad4/Curve List=Surface 1:6/Apply
消除重复结点： Finite Element/Equivalence/All/Tolerance Cube/Equivalencing Tolerance=0.005/Apply
Geometry/Create/Curve/Point/2Point/Starting Point List=Point 1/Ending Point List=Point 2/Apply /2D Arc2Point/Radius/Construction Plane List=Coord0.3/Arc Radius=13/Starting Point List=Point 2/Ending Point List=Point 3/Apply /Starting Point List=Point 3/Ending Point List=Point 4/Apply
创建应力云图。步骤如下： Create/Fringe/Result Selection/Fringe Results=拾取 EFFST-OUT/Animation Attributes/Global Variable=Load Case Index/OK/OK/Apply
创建变形工具。步骤如下： Create/Deformation/Result Selection/Deformation Result=Dispacement/Animation Attributes/Global Variable=LOADCASE INDEX/OK/Deformation Attributes/Scale=True/OK/OK/Apply
数据文件产生后，用文本编辑器加以修改，将PATRAN界面中不支 持的卡片包含进来。
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提交作业。
创建一个新的PATRAN数据库名为“post_bird”。 读入模型及结果的档案文件。同时读入时间历程文件。步骤如 下： Analysis/Read Archive File/Model And Results /Translate/Select Archive Files/“MBIRD_BIRD_0”/Add/ “MBIRD_PLATE_0”/Add/Apply/Apply
检查板元的法线方向:
Finite Elements/Verify/Element/Normals/Draw Normal Vectors/Test Control=Display Only/Apply
在凹模几何面上创建网格种子点。步骤如下： Group/Post/选中“lower_die”/Apply Finite Elements/Create/Mesh Seed/Uniform/Number of Elements=5/Curve List=Curve 4:6/Apply /Number of Elements=80/Curve List=Surface 7.1 8.1 9.3/Apply
Group/Create/New Group Name=lower_die/Apply Geometry/Create/Point/XYZ/ Point Coordinate List= [0 –0.75 0]/Apply/Point Coordinate List= [100 –0.75 0]/Apply /Curve/Point/2Point/Starting Point List=Point 12/Ending Point List=Point 13/Apply /Surface/Revolve/Axis=Coord 0.2/Total Angle=90/Curve List=Curve 8/Apply/Curve List=Surface 11.2/Apply/Curve List= Surface 12.2 /Apply/Curve List= Surface 13.2 /Apply
板料的有关材料参数如下：
杨氏模量 波松比 密度 各向异性屈服 参强化数模量 应变偏移 应变强化指数
E=100000N/m mν=20.33
ρ=8.418106kg/
mR0m3
=R45
=BR=8909=50N.8/5mm2
C=2.94 10-4
N=0.42
在PATRAN中创建凸模的几何。步骤如下： Group/Create/New Group Name=upper_die/Apply Geometry/Create/Point/XYZ/Point Coordinate List= [0 0 0]/Apply/ Point Coordinate List= [37 0 0]/Apply Point Coordinate List= [50 13 0]/Apply Point Coordinate List= [50 50 0]/Apply
Analysis/Read Time History/Result/Translate/Select Time History Files/“MBIRD_PRESSURE_0.THS”/Add/Apply/Apply
通过创建关于应力、变形及鸟体的等值面工具对结果进行动画显 示。步骤如下： Insight/Create/IsoSurface/Result Selection/选中所有情况 /Update Results/Isosurface Results=FMAT (Material Fraction)/Animation Attributes/点开Enable Animation/Global Variable=Load Case Index/OK/Result Options/Select Default Load Cases=拾取最后一步/OK/OApply
6.7 圆柱形钣金件冲压成形分析
有关工艺数据如下：
板料半径 板料厚度 凸模半径 凸模倒角半径 凹模内径 凹模倒角半径 冲压行程 冲压速度 压边圈内径 压边力 摩擦系数
100mm 0.7mm 50.0mm 13.0mm 51.25mm 5mm 40mm 4000mm/s 56.25mm 8.E8kN 0.18
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