course in ansys - aalborg universitethomes.civil.aau.dk/shl/ansysc/ansys-example0541.pdf · example...
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Course in ANSYS
Example0541
Computational Mechanics, AAU, EsbjergANSYS
Example – Plate
E = 210000N/mm2
n = 0.3a = 200mmb = 100mmt = 1mmp = 70N/mm
Objective:Plot the P-U curve for the nonlinear behaviourTasks:Model the geometryRun a static linear analysis with Prestress OnRun an eigen-buckling analysisRun the nonlinear analysis
Example0541 2Computational Mechanics, AAU, EsbjergANSYS
Example – Plate• Nonlinear buckling analysis in ANSYS is somewhat
simpler than eigenvalue buckling analysis since there is only one solution step; however, it can require more than one load step in solution. In general, a nonlinear buckling analysis is simply a nonlinear static analysis in which the load is increased until the solution fails to converge, indicating that the structure cannot support the applied load (or that numerical difficulties prevent solution). If the structure does not lose its ability to support additional load when it buckles (the plate we are analyzing is an example of such a structure), a nonlinear buckling analysis can also be used to track post-buckling behavior. We will not carry out post-buckling analysis here because of uncertainty in the validity of the results.
Example0541 3Computational Mechanics, AAU, EsbjergANSYS
Example – Read input fromLoad the example0505.lgw by File Menu > Read input from
Example0541 4Computational Mechanics, AAU, EsbjergANSYS
Example - Plate
Example0541 5Computational Mechanics, AAU, EsbjergANSYS
Example – Define LoadsSolution > Define Loads > Apply > Structural > Pressure > On lines
Select the left and right straight line
Enter 70
Press OK to finish
Example0541 6Computational Mechanics, AAU, EsbjergANSYS
Note: Pressure acts normal and inward to a surface
Example - Plate
Example0541 7Computational Mechanics, AAU, EsbjergANSYS
Example – Define Loads
Example0541 8Computational Mechanics, AAU, EsbjergANSYS
Solution > Define Loads > Apply > Structural > Force/Moment > On Nodes
Select indicated element node
Press OK
Note: If the model is remeshed all loads will be deleted with the element nodes
Example – Define LoadsSolution > Define Loads > Apply > Structural > Force/Moment > On Nodes
Change to FZ
Press OK to finish Enter 0.1
Example0541 9Computational Mechanics, AAU, EsbjergANSYS
Example0541 10Computational Mechanics, AAU, EsbjergANSYS
Example – Analysis Type
Select StaticPress OK
Example0541 11Computational Mechanics, AAU, EsbjergANSYS
Example – Load Step OptsEnter 70
Enter 3
Example0541 12Computational Mechanics, AAU, EsbjergANSYS
Example – Loadstep file
Enter 1
Press OK
Example – Define LoadsSolution > Define Loads > Apply > Structural > Pressure > On lines
Select the left and right straight line
Enter 80
Press OK to finish
Example0541 13Computational Mechanics, AAU, EsbjergANSYS
Note: Pressure acts normal and inward to a surface
Example0541 14Computational Mechanics, AAU, EsbjergANSYS
Example – Delete Load
Press OK
Select the node with FZ force
Example0541 15Computational Mechanics, AAU, EsbjergANSYS
Example – Output Ctrls
Press OK Select Every substep
Set to All
Example0541 16Computational Mechanics, AAU, EsbjergANSYS
Example – Load Step OptsEnter 80
Enter 10
Enter 10
In case ANSYS decides to perform automatic time stepping
Example0541 17Computational Mechanics, AAU, EsbjergANSYS
Example – Loadstep file
Enter 2
Press OK
Example - SolveSolution > Solve > From LS Files
Enter 1
Example0541 18Computational Mechanics, AAU, EsbjergANSYS
Enter 2
Press OK
Example – Read Results
Example0541 19Computational Mechanics, AAU, EsbjergANSYS
General Postproc > Plot Results > Deformed Shape
Select “Def+undeformed”and Press OK
Example – Contour Plot
Example0541 20Computational Mechanics, AAU, EsbjergANSYS
Example – Read Results
Example0541 21Computational Mechanics, AAU, EsbjergANSYS
General Postproc > Plot Results > Deformed Shape
Select “Def+undeformed”and Press OK
Example0541 22Computational Mechanics, AAU, EsbjergANSYS
Example – Define Variables
Press Add
Example – Add Time-History Var.
Press OK
Select Nodal DOF result
Pick the FZ node
Press OK
Select DOF solution and Translation UZ
Example0541 23Computational Mechanics, AAU, EsbjergANSYS Press OK
Example – Add Time-History Var.
Press Add
Example0541 24Computational Mechanics, AAU, EsbjergANSYS
Example0541 25Computational Mechanics, AAU, EsbjergANSYS
Example - SettingsSelect Single variable to plot on X-axis
Enter 2 to plot UZ for the top node on the X-axis
Press OK
Example – Style - Graph
Example0541 26Computational Mechanics, AAU, EsbjergANSYS
Enter Deformation UZ
Enter Force FZ
Press OK
Example – Graph Variables
Example0541 27Computational Mechanics, AAU, EsbjergANSYS
Enter 1 to plot the reaction force FZ on the Y-axis
Press OK
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