ANSYS modeling
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Aug. 2005 By G.Z. Kang, SWJTU
2. Geometry Modeling
Geometry Elements of ANSYS From lower to higher: • Keypoints • Lines • Areas • Volumes
I’ll just change this line
Main Menu> Preprocessor> Create> Nodes> in Active CS/on Working Plane/on Keypoints Main Menu> Preprocessor> Create>Elements> -Auto Number- Thru. Nodes Main Menu> Preprocessor> Create>Elements>- User Number- Thru. Nodes
Material attributes
Main Menu: Preprocessor > Material Properties > Material Model
Aug. 2005 By G.Z. Kang, SWJTU
Aug. 2005 By G.Z. Kang, SWJTU
Element type
Aug. 2005 By G.Z. Kang, SWJTU
Four kinds of modeling method
Option A 1. Build solid model. 2. Defeature as needed. 3. Export solid model. CAD Package ANSYS 1. Build solid model. 2. Mesh finite element model. 1. Import solid model 2. Complete or modify as needed. 3. Mesh finite element model. Build the nodes and elements directly as needed. 1. Build solid model 2. Defeature as needed. 3. Mesh finite element model. 4. Export finite element model. Import finite element model
Aug. 2005 By G.Z. Kang, SWJTU
6. Direct Modeling
Steps: Define nodes Define element attributes Define elements by existed nodes Modifying the elements
Volumes Areas
OOPs!
Areas
Lines Keypoints
Lines Keypoints
Aug. 2005 By G.Z. Kang, SWJTU
Working plane A moveable reference plane, helpful to construct geometry model.
Notes: • When a rectangle is constructed, it means nine geometry elements are automatically constructed, i.e., four keypoints, four lines, one area.
Oh yeah! I remember these entity things.
Aug. 2005 By G.Z. Kang, SWJTU
Change the space of grid-mesh
Space is 0.1
ຫໍສະໝຸດ Baidu
Space is 0.05
Aug. 2005 By G.Z. Kang, SWJTU
Change the increment of snap
Draw a rectangle with help of snap, the increment of snap is set as equal to the space of grid-mesh.
Elements Areas
(a) Original meshed model
(b) Mesh cleared
(c) Solid model modified
(d) Revised remeshed model
Aug. 2005 By G.Z. Kang, SWJTU
Local refine
Aug. 2005 By G.Z. Kang, SWJTU
Chapter 2 Modeling
1. Introduction 2. Geometry Modeling 3. Element Attributes 4. Meshing 5. Modifying 6. Direct modeling
Aug. 2005 By G.Z. Kang, SWJTU
1. Introduction
Aug. 2005 By G.Z. Kang, SWJTU
3. Element Attributes
Including: Material attributes Element type Element real constant
Aug. 2005 By G.Z. Kang, SWJTU
. .
Line Keypoints Area Line
Line
Line
. .
• The rectangle lies in workplane. • ANSYS will number all items automatically.
Aug. 2005 By G.Z. Kang, SWJTU
3-D primitives
Aug. 2005 By G.Z. Kang, SWJTU
2-D primitives
Rectangle
Circle
Polygon
Main Menu: Preprocessor > -Modeling- Create >
Aug. 2005 By G.Z. Kang, SWJTU
Aug. 2005 By G.Z. Kang, SWJTU
5. Modifying
Elements
I’ll try to change this line again
Nodes
Volumes Areas Lines Keypoints
Oh No! It’s worse than before
Nodes
Lines
Keypoints
Aug. 2005 By G.Z. Kang, SWJTU
Main Menu: Preprocessor > Element Type > Add/Edit/Delete
Aug. 2005 By G.Z. Kang, SWJTU
Aug. 2005 By G.Z. Kang, SWJTU
Element real constant
Aug. 2005 By G.Z. Kang, SWJTU
WZ WY WX
It can be obtained by intersect a hollowed sphere with a block.
Aug. 2005 By G.Z. Kang, SWJTU
Main Menu: Preprocessor > -Modeling- Operate >
Aug. 2005 By G.Z. Kang, SWJTU
Aug. 2005 By G.Z. Kang, SWJTU
Main Menu> Preprocessor> -Meshing- Shape & Size> -Global- Area Controls Lab=Expand and/or Trans.
Aug. 2005 By G.Z. Kang, SWJTU
4. Meshing
Three steps: Set Meshing attributes Set Meshing options Meshing: Free mesh and mapped mesh
Aug. 2005 By G.Z. Kang, SWJTU
Set Meshing attributes
Block
Cylinder
Prism
Sphere
Cone
Torus
Main Menu: Preprocessor > -Modeling- Create >
Aug. 2005 By G.Z. Kang, SWJTU
Example: To construct a hollowed sphere
Main Menu: Preprocessor > Create > Sphere > By Dimensions ...
Y Z
X
Aug. 2005 By G.Z. Kang, SWJTU
Boolean operate The Boolean operate in ANSYS includes add, subtract, intersect, divide, glue and overlap.
How to construct the following model?
wy y x wx
Origin
Grad-mesh, its space is adjustable
Aug. 2005 By G.Z. Kang, SWJTU
Utility Menu: WorkPlane >
Aug. 2005 By G.Z. Kang, SWJTU
Utility Menu: WorkPlane > WP Settings ...
Add
A1+A2=A3
Aug. 2005 By G.Z. Kang, SWJTU
Subtract A1-A2=A3
Aug. 2005 By G.Z. Kang, SWJTU
Overlap
New areas A3, A4 and A5 are obtained from the overlap of A2 and A1.
Aug. 2005 By G.Z. Kang, SWJTU
Glue
Divide
A1
Divide
Common line
A2
A3
Aug. 2005 By G.Z. Kang, SWJTU
Extrude/Sweep Areas to Volumes
Aug. 2005 By G.Z. Kang, SWJTU
Aug. 2005 By G.Z. Kang, SWJTU
Set Meshing options
Aug. 2005 By G.Z. Kang, SWJTU
Meshing Mesh tools
Aug. 2005 By G.Z. Kang, SWJTU
Main Menu> Preprocessor> -Meshing- Mesh> Smartsize Levels
Aug. 2005 By G.Z. Kang, SWJTU
Typical steps for modeling:
Set the scheme of modeling Clarify the aim of analysis Outline the geometry feature of the model Choose suitable element type Ensure the fine and suitable mesh Chose the method of modeling Solid modeling Direct modeling Practical modeling