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