Ansys History Ansys Tutorial
Zhibin Fang Dec, 2004
A general purpose FEA package Founded in 1970 Founder: Dr. John Swanson 1969: STASYS (Structural Analysis System). 1969) 1970: Ansys, CDC 6600 machine (1970) 1975: pc version ….. 2004: Ansys 8.1 multi-physics Employee: 550 (2004) Canonsburg, PA
What can Ansys do?
Structural analysis: stress/strain, deformation, etc. Heat transfer Fluid flow (CFD) Electromagnetics Multi-physics (solid/fluid/electromagnetic..) ….
How it works?
Finite Element Method (FEM)
Continuum media Piece-wised element connected by the Nodes Curve Piece-wised line
1
FEM
A numeric approximate results The precision of results depends on the model type and mesh Experience: Simple model is the best model
FEM Process: 3 basic steps
PREPROCESSING:
build FEM model
Geometry Construction Mesh Generation (right element type!) Boundary and load condition implmentation
SOLVING:
submit the model to Ansys solver
POSTPROCESSING:
1D beam? or 3D block?
check and evaluate result
Stress/Strain contour plot
FEM Process: 3 basic steps
Third party CAD model Ansys 3D model Geometry construction Preprocessing Mesh generation Load implementation Job submission solving
Need Help?
Tutorial: help\ANSYS tutorial Help: help\help topics Useful website:
http://www.mece.ualberta.ca/tutorials/ansys/index.html
Evaluate the results
Postprocessing
2
Unit
Ansys had no build-in unit system The unit must be consistent.
Bicycle Frame Example
using ANSYS to solve a simple 3D space frame problem
Bicycle Frame Example
A 3D frame structure Material: steel Unit: mm/N
Ask yourself before you start
What kind of element you will use?
Pipe
What is the boundary condition?
Fixed at three points
What is the load?
600 and 200 N
Which unit system you will use?
mm/N/Mpa
Section view
3
Bicycle Frame Example
• Physical model and FEM model
Bicycle Frame Example
Preprocessing
Geometry construction: key points lines Specify element type ( pipe16), and element properties (real constants) Specify the material (input young’s modulus) Mesh Apply load and boundary consitions
Bicycle Frame Example
Solving:
Current LS
Bicycle Frame Example
Postprocessing:
Plot deformed shape Plot Von Mises stress List reaction force Plot bending moment
4
Questions?
Create 6 key points
Prepoocessor modeling key points
0,325,0 0,400,0 500,400,0 500,0,0 825,0,50 825,0,-50
create
Create lines
Modeling create lines
Define element
Element add pipe 16, option K6 Real constant: 25mm/2,
5
Material
Material model structural E; 70000MPa, v=0.33 isotropic
Mesh
Mesh tool set the size of mesh 20mm
Load
Load
Apply p6, fy=-600N, p4 fy=-200N
Solution
Solve current LS
Bcs
3 support points fixed
6
General postprocessor
Plot deformed shape
Plotcontrol hard copy
General postprocessor
Plot von misses stress
Define element table, von mises Define SMISC 6 I moment and SMIMC 12 J moment
Plot deflection
Nodal solution
7