8 有限元分析上机指导书之 ANSYS连杆建模实践

6.5
2.5
0.5
1.8 0.3
1.0R
1.4R
0.4
0.7
45
o
Spline through six control C L
C L
Crank pin
Wrist pin
All dimensions in inches
45
o
0.2
0.4 0.3
4.7
4.0 3.2
有限元分析实验指导书之 二维单元的使用（连杆分析）
1. 进入ANSYS 工作目录,将 “c -rod” 作为jobname 。

2. 创建两个圆面：
– Main Menu > Preprocessor > -Modeling- Create > -Areas- Circle > By Dimensions ... • RAD1 = 1.4 • RAD2 = 1 • THETA1 = 0
• THETA2 = 180, 单击[Apply]
• 然后设置THETA1 = 45,再单击[OK]
3. 打开面:编号
– Utility Menu > PlotCtrls > Numbering ... • 设置面号on, 然后单击[OK]
4. 创建两个矩形面:
– Main Menu > Preprocessor > -Modeling- Create > -Areas- Rectangle > By Dimensions ... • X1 = -0.3, X2 = 0.3, Y1 = 1.2, Y2 = 1.8, 单击[Apply] • X1 = -1.8, X2 = -1.2, Y1 = 0, Y2 = 0.3, 单击 [OK]
5. 偏移工作平面到给定位置 (X=
6.5):
– Utility Menu > WorkPlane > Offset WP to > XYZ Locations + • 在ANSYS 输入窗口输入6.5 • [OK]
6. 将激活的坐标系设置为工作平面坐标系:
– Utility Menu > WorkPlane > Change Active CS to > Working Plane
7. 创建另两个圆面:
–Main Menu > Preprocessor > -Modeling- Create > -Areas- Circle > By Dimensions ...
•RAD1 = 0.7
•RAD2 = 0.4
•THETA1 = 0
•THETA2 = 180, 然后单击[Apply]
•第二个圆THETA2 = 135, 然后单击[OK]
8. 对面组分别执行布尔运算:
–Main Menu > Preprocessor > -Modeling- Operate > -Booleans- Overlap > Areas + •首先选择左侧面组, 单击[Apply]
•然后选择右侧面组, 单击[OK]
9. 将激活的坐标系设置为总体笛卡尔坐标系:
–Utility Menu > WorkPlane > Change Active CS to > Global Cartesian
10. 定义四个新的关键点:
–Main Menu > Preprocessor > -Modeling- Create > Keypoints > In Active CS …
•第一个关键点, X=2.5, Y=0.5, 单击[Apply]
•第二个关键点, X=3.25, Y=0.4, 单击[Apply]
•第三个关键点, X=4, Y=0.33, 单击[Apply]
•第四个关键点, X=4.75, Y=0.28, 单击[OK]
11. 将激活的坐标系设置为总体柱坐标系:
–Utility Menu > WorkPlane > Change Active CS to > Global Cylindrical
12. 通过一系列关键点创建多义线:
–Main Menu > Preprocessor > -Modeling- Create > -Lines- Splines > With Options > Spline thru KPs +
•如图按顺序拾取六个关键点, 然后单击[OK]
•XV1 = 1
•YV1 = 135
•XV6 = 1
•YV6 = 45
•[OK]
13. 在关键点1和18之间创建直线:
–Main Menu > Preprocessor > -Modeling- Create > -Lines- Lines > Straight Line + •拾取如图的两个关键点, 然后单击[OK]
14. 打开线的编号并画线:
–Utility Menu > PlotCtrls > Numbering ...
•打开线的编号, 单击[OK]
–Utility Menu > Plot > Lines
15.由前面定义的线6, 1, 7, 25创建一个新的面:
–Main Menu > Preprocessor > -Modeling- Create > -Areas- Arbitrary > By Lines + •拾取四条线(6, 1, 7, and 25),然后单击[OK]
16. 放大连杆的左面部分:
–Utility Menu > PlotCtrls > P an, Zoom, Rotate …
•[Box Zoom]
17. 创建三个线倒角:
–Main Menu > Preprocessor > -Modeling- Create > -Lines- Line Fillet + •拾取线36 和40,然后单击[Apply]
•RAD = .25,然后单击[Apply]
•拾取线40 和31, 然后单击[Apply]
•[Apply]
•拾取线30和39, 然后单击[OK]
•[OK]
–Utility Menu > Plot > Lines
18. 由前面定义的三个线倒角创建新的面:
–Main Menu > Preprocessor > -Modeling- Create > -Areas- Arbitrary > By Lines + •拾取线12, 10, 及13, 单击[Apply]
•拾取线17, 15, 及19, 单击[Apply]
•拾取线23, 21, 及24, 单击[OK]
–Utility Menu > Plot > Areas
19. 将面加起来形成一个面:
–Main Menu > Preprocessor > -Modeling- Operate > Add > Areas + •[Pick All]
20. 使模型充满整个图形窗口:
–Utility Menu > PlotCtrls > Pan, Zoom, Rotate …
•[Fit]
21. 关闭线及面的编号:
–Utility Menu > PlotCtrls > Numbering ...
•关闭线及面的编号, 单击[OK]
–Utility Menu > Plot > Areas
22. 将激活的坐标系设置为总体笛卡尔坐标系:
–Utility Menu > WorkPlane > Change Active CS to > Global Cartesian –Or issue:
CSYS,0
23.将面沿X－Z面进行映射(在Y 方向):
–Main Menu > Preprocessor > -Modeling- Reflect > Areas + •[Pick All]
•选择X-Z面, 单击[OK]
24. 将面加起来形成一个面:
–Main Menu > Preprocessor > -Modeling- Operate > Add > Areas + •[Pick All]
25. 关闭工作平面:
–Utility Menu > WorkPlane > Display Working Plane
26. 存储数据库并离开ANSYS:
–拾取“SAVE_DB”
–拾取“QUIT” 选择“Quit - No Save!”[OK
27.选取93号壳单元
Main Menu>Preprocessor>Element Type>Add/Edit/Delete>Add>
28.设置壳单元厚度为0.3
Main Menu>Preprocessor>Real Constants>Add/Edit/Delete>Add>ok
29.设置材料参数
Main Menu>Preprocessor>Material Props>Material Models
30.分网
Main Menu>Preprocessor>Meshing>MeshTool
31.施加约束
Main Menu>Preprocessor>Loads>Define Loads>Apply>Structural>Displacement>On Lines 选取小孔边缘，约束小孔的所有自由度
32.加载
Main Menu>Preprocessor>Loads>Define Loads>Apply>Structural>Pressure>On Lines
选取大孔的半个边缘，
33.显示壳单元的厚度
旋转模型，使模型显示成薄片状
勾选Display of element后，能显示0.3的壁厚。

34.求解
Main Menu>Solution>Solve>Current LS
35.后处理
Main Menu>General Postproc>Plot Results>Contour Plot>Nodal Solu Main Menu>General Postproc>Plot Results>Contour Plot>Element Solu
输出窗口图片为.emf 文件（可调入word文件中）。