HyperMesh Hype rMesh 12.0 Tutorials Tutorials Nastran Solver Interface
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HyperMesh 12.0 Tutorials - Nastran Solver Interface
Nastran........................................................................................................................................... 1 HM-4200: Setting Up Nastran Static Analysis in HyperMesh ............................................................................................................................................... 2
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HyperMesh 12.0 Tutorials - Nast ran Solver Interf ace
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Nastran The following Nastran tutorials are available:
HM-4200: Setting Up Nastran Static Analysis in HyperMesh
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HM-4200: Setting Up Nastran Static Analysis in HyperMesh In this tutorial, you will learn how to: Define a model in HyperMesh Apply boundary conditions in HyperMesh Write the Nastran input deck View the results You will use the HyperMesh Nastran interface to create finite elements on the geometry of a plate with a hole, apply boundary conditions, and perform finite element analysis.
Exercise
Step 1: Retrieve the model file and select the Nastran user profile 1.
Upon opening, HyperMesh prompts you to selec t a user profile. Select t he Nastran profile.
2.
From the menu bar, select File > O p e n > M o d e l.
3.
Browse to the file plate_hole.hm.
4.
Click O p e n.
Step 2: Create material collectors and components 1.
Right click in the Model Browser and select Create > Material .
2.
In the Name= field, t ype steel.
3.
In the Type field select ISOTROPIC .
4.
For the Card image, select MAT1.
5.
Check the box for Ca rd edit mate rial upon creation and then click Create .
6.
In the E= field, t ype 2E5 .
7.
In Nu field, type 0.30.
8.
In the Rho field, type any number (if needed).
9.
Click return to close the card image, and then return again to close the Material panel.
10. Right c lick in the Model Browser and select Create > C o m p o n e n t .
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11. In the Name field, type shells. 12. Click the Property tab and select Assign property . 13. In the Name field, t ype pshells. 14. In the Type field select 2D . 15. For the Card image, select PSHELL. 16. Click Create property . 17. In the card edit panel that appears, click on [T] and enter 1.0 as the thickness, then click return. 18. Click the Material tab and select Assign m aterial . 19. In the Name field, select s t e e l. 20. Click Create . This creates the component and property as well as assigns a material collector in a single step.
Step 3: Mesh the geometry The Automeshing panel allows you to mesh interactively on surfaces. It also includes tools for manipulating surface edges and meshing fixed points (locations where the mesher is required to place a node.) The elements generated are organized into the current component and shells. 1.
Press F1 2 to access the Automesh panel.
2.
Go t o t he size and bias subpanel.
3.
Click surfs and click displayed .
4.
In the element size = field, type 40 .
5.
T oggle to elem s to current com p .
6.
Click m e s h.
7.
Click return to save the mesh in the shells component.
8.
Click return to close the panel.
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Plate mesh using element size of 40mm
Steps 4-6: Apply boundary conditions to the model In this sect ion, t he model is constrained so that t wo of t he four edges cannot move. A tot al lateral load of 1000N is applied at the edge of the hole so that all forces point in the positive z-direction.
Step 4: Create collectors Before creating boundary condition and loads, load collectors are created first. These load collectors are used for boundary conditions and loads. 1.
Right click in the Model Browser and select Create > Load C ollector .
2.
In the Name field, enter spcs.
3.
Click Color and select desired color.
4.
Click Create . The collector is created.
5.
Right click in the Model Browser and select Create > Load C ollector .
6.
In the Name field enter forces.
7.
Click Color and select the desired color.
8.
Click Create . The collector is created.
9.
Click return to close the panel.
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Step 5: Create constraints 1.
In the Model Browser, right click on spcs and select Make C urrent .
2.
From the menu bar select B C s > Create > Constraints .
3.
Selec t the create subpanel.
4.
Click nodes and select by window from the extended entity selection menu. HyperMesh opens the Build Window panel.
5.
Click interior , if not already select ed.
6.
Create a window around the left and right edges of the model. Do this by picking points on the screen with your mouse.
7.
Click select entities . The nodes along the left and right edges of the model are selected (see the following image). HyperMesh returns to the Constraints panel.
Select these nodes to apply single point constraints
8.
Click dof1-dof6 , if not already select ed. Note:
9.
Dofs t hat are chec ked are c onstrained. Dofs 1, 2, and 3 are x, y, and z translation degrees of freedom Dofs 4, 5, and 6 are x, y, and z rotational degrees of freedom
Click create to apply these constraints to the selected nodes.
10. Click return.
Step 6: Create forces on the nodes around the hole 1.
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In the Model Browser, right click on forces and select Make C urrent .
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2.
From the menu bar, select B C s > Create > Forces .
3.
Click nodes and select by window from the extended entity selection menu. HyperMesh opens the Build Window panel.
4.
Select interior .
5.
Create a window around the hole of the model. Do this by pic king points on the screen with your mouse.
6.
Click select entities . The nodes around the hole of the model are selected (see the image below). HyperMesh returns to the Constraints panel.
Select these nodes to create loading around hole.
7.
Click nodes and select s a v e from the extended entity selection menu.
8.
Click return.
9.
On the Tool page, c lick count and select the FE entities subpanel. The nodes are counted automatically so that a calculation can be made to create a total force of 1000N.
10. Click the upper left switc h and select nodes . 11. Click nodes and select retrieve from the extended entity select menu. The nodes saved in the Forces panel are retrieved. 12. Click selected to count the number of nodes around the hole (note the number of nodes selected). 13. Click return. 14. From the menu bar, select B C s > Create > Forces .
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15. Click nodes and select retrieve from the extended entity selection menu. 16. Click in the magnitude = field and enter 21.277 (this is 1000/47). The total load on the nodes around the hole is 1000N. 17. Click the plane a nd v ector definition switch below magnitude = and select z-axis . 18. Click create . 19. Click return.
Steps 7-8: Create a Nastran subcase (a load step in HyperMesh) Step 7: Create the loadstep 1.
From the menu bar, select Setup > Create > Loadsteps .
2.
In the name = field, enter lateral force.
3.
Check SPC , click the = button, and select the spcs load collector.
4.
Check LOAD , c lick in the field, and select the forces load collector.
5.
Verify that the type is set to linea r static
6.
Click create .
7.
Click edit .
8.
Click Output .
9.
Click the option for Displacement .
10. Click the option for Stress . 11. Click return to exit the card editor. 12. Click return to exit to the main menu.
Step 8: Create control cards 1.
From the menu bar, select Setup > Create > Control Cards .
2.
Click SO L.
3.
Click the switch next to Analysis and select Statics from the pop-up menu.
4.
Click return.
5.
Click PARAM .
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6.
Click AUTOSPC .
7.
Click POST .
8.
In the card edit field above, click on POST_V1 to make this option editable and enter in the value -2. This option spec ifies t hat an op2 file should be created.
9.
Click return.
10. Click return again to close the panel.
Steps 9-10: Write the Nastran input deck In this sec tion, write the Nastran input deck file, specified with the .dat extension, before running Nastran.
Step 9: Write your file 1.
From the menu bar select File > Export > Solve r Deck .
2.
Set the File Type: field to Nastran.
3.
Select t he desired directory and enter plate_hole.dat in the File: field.
4.
Click Save .
5.
Click Export . This writes your HyperMesh database as a Nastran ASCII input deck.
Step 10: Save your file and exit HyperMesh 1.
From the menu bar select File > Save As > M o d e l.
2.
Select the desired directory, and type plate_hole_new.hm in the File name field.
3.
Click Save .
4.
Exit HyperMesh.
Steps 11-14: View the results After running Nastran, the punch file plate_hole.op2 is c reated. T his file contains displacement and stress results for your linear static analysis. This section describes how to view those results in HyperMesh.
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Step 11: Add a HyperView page to the session and load the fem and op2 files 1.
On the toolbar, click the Add Page icon
.
2.
Set the Client Type t o HyperView .
3.
From the menu bar select File > O p e n > M o d e l. This opens the Load Model panel.
4.
Click on the file icon next to Load model and select plate_hold.dat.
5.
Click on the file icon next to Load results and select plate_hold.op2.
6.
Click Apply to load the model and results.
Step 12: View a deformed shape 1.
From the menu bar select Results > Plot > D e f o r m e d.
2.
For Result type select Displacement .
3.
For Scale select Mode l units and for Type select Uniform .
4.
For Value enter 25 .
5.
Under Undeformed shape, for Show, select Wireframe .
6.
Click Apply to view a deformed plot of your model overlaid on the original, undeformed mesh (refer to the figure below).
Isometric view of deformed plot overlaid on original undeformed mesh. Model units are set to 250.
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Step 13: View a contour plot of stresses and displacements 1.
From the menu bar select Results > Plot > Contour .
2.
For the Result type select Displaceme nt (v).
3.
On the toolbar, select the XY Top Plane View
4.
Click Apply .
5.
For the Result type select Stress (t).
6.
For Averaging method select Simple .
7.
Click Apply .
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