From CAD to CAE (1-ANSYS) 11/22/2008
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From CAD to CAE (1-ANSYS) 11/22/2008
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From CAD to CAE (1-ANSYS) 11/22/2008. Basics of FEA. Finite Element Element with finite volume/area and finite number Major Steps: a) Pre-Process Geometry/mesh b) Solve Load/B.C/I.C c) Prost-Process List/plot results. Pre-setup. - PowerPoint PPT Presentation
Transcript of From CAD to CAE (1-ANSYS) 11/22/2008
From CAD to CAE(1-ANSYS)
11/22/2008
Finite Element Element with finite volume/area and finite number
Major Steps: a) Pre-Process Geometry/mesh
b) Solve Load/B.C/I.C
c) Prost-Process List/plot results
Basics of FEA
Pre-setupGGUI: Utility Menu > File > Change Jobname > 輸入 chairGGUI: Utility Menu > File > Change Title > 輸入 chairGGUI: Main Menu > Preferences > Structural 打勾
CAD/CAE systemData exchange
CADPro/ESolid EdgeSolid WorksUGI-Deas…
CAEANSYSCOMSOLMSC.MARCMSC.NastranABAQUSMoldexMold Flow…
IgesStlParasolid…
IGES, Parasolid, STL• IGES=Initial Graphics Exchange Specification• 轉檔缺點 : 常有破洞 , 尤其 CAD 曲面• 轉檔失敗機率 : 不一定• 對策 :
– 1. 修補 – 2. 改 CAD 的特徵 – 3. 換其他轉檔格式 (*.x_t , *.SAT …), 但注意軟體是否支援 , 是否付費
• 以 CAD 軟體來畫外形 : 省時省力
Para:Stl:
Import CAD Model• GUI: Utility Menu > File > Import > IGES/Para >
找到 IGES/Para檔案的目錄讀入 chairansys.iges/Para
Import IGES ( 續 )
• GUI: Utility Menu > PlotCtrls > Style > Solid Model Facets >
• GUI: Utility Menu > List > Volumes• GUI: Utility Menu > Plot > Volumes
ctrl + Right click to rotate view
Define Element
Define Element
ANSYS 手冊
Define Material
Define Material
SI Unit:mm , N, MPa
Mesh Tool: Volume free mesh• GUI: Main Menu > Preprocessor > Meshing >
Mesh Tool
Mesh Tool: Volume free mesh
Mesh Result
Try to plot points/nodes/lines/areas/elements
Boundary Conditions• GUI : Main Menu > Solution > Analysis Type > New Analysis > Static• GUI : Main Menu > Solution > Define Loads > Apply > Structural >
Displacement
UZ=0對稱面
UX=0對稱面
UY=0線
Boundary Conditions
UX=0對稱面
Apply PressureGUI : Main Menu > Solution > Define Loads > Apply > Structural > Pressure
0.2 MPa = 200,000 N/m^2
Apply Pressure0.2 MPa = 200,000 N/m^2
Apply Pressure0.2 MPa = 200,000 N/m^2
Save *.db
• GUI: Utility Menu > File > Save as Jobname.db , • in your working directory
Solution• GUI: Main Menu > Solution > Solve > Current LS >
Post-Process (displacement)
Post-Process (displacement)
Post-Process (stress)
MPa
討 論• FEM model 準不準確 ?• 以 CAE 分析來說 , 此“類似塑膠椅”的結構還要考慮什麼 ?• 強度夠不夠 ?• 可載重多大 ?
• CAD 之 IGES 檔案 , 使用上的優缺點 .
