ansys面与面接触分析实例
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面与面接触实例:插销拨拉问题分析
定义单元类型
Element/add/edit/delete
定义材料属性
Material Props/Material Models
Structural/Linear/Elastic/Isotropic
定义材料的摩擦系数
建立几何模型
Modeling/Create/Volumes/Block/By Dimensions X1=Y1=0,X2=Y2=2,Z1=2.5,Z2=3.5
Modeling/Create/Volumes/Cylinder/By Dimensions
Modeling/Operate/Booleans/Subtract/V olumes
先拾取长方体,再拾取圆柱体。
Modeling/Create/Volumes/Cylinder/By Dimensions
划分掠扫网格
Meshing/Size Cntrls/ManualSize/Lines/Picked Lines 拾取插销前端的水平和垂直直线,输入NDIV=3 再拾取插座前端的曲线,输入NDIV=4
PlotCtrls/Style/Size and Shape,在Facets/element edge列表中选择2 facets/edge
建立接触单元
Modeling/Create/Contact pair,弹出Contact Manager对话框,如图所示。
单击最左边的按钮,启动Contact Wizard(接触向导),如图所示。
单击Pick Target,选择目标面。
选择接触面
定义位移约束
施加对称约束,Define Loads/Apply/Structural/Displacement/Symmetric B.C/On Areas,选择对称面。
再固定插座的左侧面。
设置求解选项
Analysis Type/Sol’s Control
求解:Solve/Current LS
绘制装配应力图
General Postproc/Plot Results/Contour Plot/Nodal Solution,选择Stress/von Mises stress
求解拨拉过程
选择Z=4.5处的所有节点。
Define Loads/Apply/Structural/Displacement/On Nodes,弹出Apply U,ROT on Nodes拾取框,单击Pick All按钮,选择UZ,在Displacement value输入1.7
Select/Everything
Analysis Type/Sol’s Control
Solve/Current LS
结果后处理
扩展模型:Style/Symmetry Expansion/Priodic/Cyclic Smmetry,在弹出的对话框中选择1/4 Dihedral Sym
选择General Postproc/Read Results/By time/frequency,在TIME域输入120。
选择插销中与插座接触的单元,在Select Entities中选择Element,在列表中选择By Element name,再Element Name域输入174
Plot/Elements
General Postproc/Plot Results/Contour Plot/Nodal Solution,在对话框中选择Contact / Contact Pressure
读入载荷步2结果。Read Results/By Load Step
绘制拨拉过程的应变变化动画
PlotCtrls/Animate/Over Results,弹出如图所示的对话框。
命令流操作:
(1)建立几何模型
/
/title,bolt_pulling analysis
/PREP7
Block,-2,2,-2,2,2.5,3.5
/view,1,1,1,1
/ang,1
/rep,fast
Cylind,0.49,,2.5,3.5,0,360
Vsbv,1,2
Cylind,0.5,,2,4.5,0,360
/pnum,volu,1
Wpstyle,0.05,0.1,-1,1,0.003,0,0,,5 Wpstyle,,,,,,,,1
Wpro,,,90
Wsbw,all
Vdele,4,,,1
Vdele,6,,,1
Wpcsys,-1,0
Wpro,,90
Vsbw,all
Vdele,p51x,,,1
Wpcsys,-1,0
Wpstyle,,,,,,,,0
(2)定义单元类型、材料模型和网格划分Et,1,solid185 Mptemp,,,,,,,,
Mptemp,1,0
Mpdata,ex,1,,36e6
Mpdata,prxy,1,,0.3
Lesize,4,,,3,,,,,0
Lesize,10,,,3,,,,,0
Lesize,18,,,4,,,,,0
Vsweep,all
/shrink,0
/eshape,0.0
/Efacet,2
/ratio,1,1,1
/cformat,32,0
(3)定义接触单元
/com,contact pair creation-start
Cm,_nodecm,node
Cm,_elemcm,elem
Cm,_kpcm,kp
Cm,_linecm,line
Cm,_areacm,area
Cm,_volucm,volu