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MENG 421 Assignment 10

Ansys: Stressed plate with hole

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Lecture notes -- Milestones, 1, Failure, Plane42, Plane55, Plane82,
End support, Full support, Correct, Wrong, Capture  

In the previous lesson, Assignment 9, you created a model of one-quarter of a plate with a hole, applied the default mesh, and then refined the mesh around the hole. In today's lesson you will apply the constraint and load to this plate and determine the resulting displacement and stress. You will create the second and third figures below. Then you will animate them.

If you find the lower part of a window off the screen, hold the Alt key while pressing the Space Bar. Release both keys and press the M key. Now you can move the window by pressing the cursor arrows. For example, press the up arrow to raise the window. Press Enter when the window is in the new position or press the Esc key to cancel this action.

Be careful how you constrain the plate. The lower edge can move right but not down. Similarly, the left edge can move up but not to the left. You must be careful to chose one-dimensional (roller) supports not only at the ends but also at each node. If the supports are incorrect, the edges will not be straight.

Constraints for plate, click to enlarge Deflection in plate, click to enlarge Stress in plate, click to enlarge

  1. Before starting Ansys be sure that your directory has at least 1.5 MB of free space. Otherwise you won't be able to save your work.
  2. Make the changes you have in the past lessons including the clearing of C:\WINDOWS\Temp.
  3. There are two ways to resume your work from Assignment 9. You can start with the binary DB file. Alternatively, you can edit out the beginning lines of your most recent batch file Plate52.a that you made.
  4. Start Ansys
  5. Continue with your most recent version
  6. You should have a black background. If not, type the Ansys command:
    Then click the Plot menu and pick Replot.
  7. Utility Menu: File | Change title | (Click at end, change date, add Part 2) | OK
  8. If the elements don't show, Utility Menu: Plot | Elements
  9. Constrain the lower edge in Y direction
  10. Constrain the left edge in X direction
  11. Apply pressure load
  12. (Main Menu:) Solution:
  13. Main Menu: General Postproc
  14. General Postproc: Read Results -- Last Set
  15. General Postproc: Plot Results
  16. Plot Results: Deformed Shape
  17. Plot Deformed Shape: Def + undeformed | OK
    Your plate should look like this
    Check that you applied the constraints properly. Your figure is one-quarter of the entire plate. So the left and bottom edges are constrained by the remaining three-quarters of the plate. These edges must be straight and must remain that way. That is, the lower edge cannot move up or down (a UY constraint) and the left edge cannot move left or right (a UX constraint). On the other hand, if your figure looks like this you did not constrain the bottom and left edges correctly. Please start again at the top of this page.
  18. When the figure looks correct, capture it.
  19. Copy file.log and name it Plate19b.a
  20. Utility Menu: File | Save as | plat82d.db | OK
  21. To animate: PlotCtrls | Animate | Deformed Shape | Def + undeformed | OK
    To see a 625KB animation of the deformation, click here.
  22. (General Postproc) Plot Results: Contour Plot -- Nodal Solu
  23. Contour Nodal: Stress ( on left), von Mises SEQV (on right) | OK
    Your plate should look like this. When the figure looks correct, capture it.
  24. Copy file.log and name it Plate24b.a
  25. Utility Menu: File | Save as | plate82s.db | OK
  26. To animate: PlotCtrls | Animate | Deformed Results | Stress (left) -- von Mises SEQV (right) | OK
    Notice that the highest stresses (in red) are at the top of the hole. You can click Stop and then successively click Next to single-stop the pictures. To see a 600KB animation of the stress, click here.
  27. Toolbar: Quit | Quit - no save | OK

  28. Assignment
    Create a cover sheet describing what you did including the refinement of the the element size. Edit the two graphics as you did last time by picking negative, gray scale, and brightness adjustment. Include a printout of your typed commands. Turn in the package as specified at the lab.

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Revised: March 31, 2004 -- Copyright 1997-2004 ARMiller