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Bracket meshed with Ansys, click to enlarge



MENG 421 Assignment 3

Ansys Graphics Mode






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In today's lesson you will see the power of Ansys graphical mode by creating, capturing, and printing the above figure. (Click the figure to enlarge it.) Today we will work in batch mode as we did last time. You will also learn how to use the Pan, Zoom, Rotate Tool. The Ansys code for today only has a preprocessor section to define the model. Check the bracket code to see that Shell93, an 8-node structural shell element is used. We will not apply a load.

Notice that today's problem is very different from the one you did last week. For that lesson, you found the displacements and stresses in an axially-loaded bar. Since the system was formed from two uniform bars, it was natural to put nodes and apply loads at the bar ends. That is, it was a discrete problem. By contrast, today's problem and the remaining lessons deal with continuous bodies that do not have natural nodes. For these problems, Ansys needs to create the elements. Sometimes you must help Ansys improve the element shapes. For example, you know from your Strength of Materials class that stresses can be triple around a hole. The finite elements need to be smaller and more numerous where stresses are rapidly changing. Look at the relative size of the elements around the holes in the above figure.

  1. Getting started

  2. Setting up IrfanView
    IrfanView (pronounced Ear-Fun-View or Ur-Fun-View) is a photo editor you can use for screen capture and graphics editing. The MS Photo Editor is better for editing, but it is not current available on the Tech PCs. Also it cannot make screen captures. Both are on the Mechanical Engineering computers. To make a shortcut to IrfanView, do the following.

  3. Setting up MS Photo Editor
    (Do this after it has been installed on the Tech computers in a few weeks(?).)
    The Photo Editor is a part of MS Office and so is available on the Tech PCs. You will use it to edit and print graphic files you have captured with LView. To make a shortcut to the Photo Editor, do the following.

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  4. Copy the file bracket.a from the class directory

  5. Editing your Ansys File
    In this section you will edit the Ansys file Bracket.a.

  6. Setting the Ansys workspace
    Last time you configured Ansys to use the directory C:\WINDOWS\Temp for its workspace. You learned that Ansys creates very large work files that you do not need. And if Ansys puts the files in your own directory, you will soon be out of space. Be sure that you have configured Ansys to use C:\WINDOWS\Temp.

  7. Running Ansys
    In this section you will run your Bracket file with Ansys in batch mode. In the last lesson you ran axial1 in batch mode too, but since it was a one-dimensional problem, the graphic was not very interesting.

  8. Manipulating the figure in Ansys
    You can change the appearance of the Ansys figure by using a Zoom tool.

  9. Capture, edit, and print your figure with IrfanView
    In this section you will capture your Ansys figure from the screen, then can edit and print it.

  10. More use of the Pan, Zoom, Rotate tool
    Change your figure some more with the Zoom tool. Pan-Zoom tool
  11. Click the Pan, Zoom, Rotate header to make it visible.
  12. Click the small and large dots to zoom out or in. Additional clicks repeat the command.
  13. Try the Top, Front, Iso, Obliq buttons.
  14. Reduce the size with the small button, then click the Box Zoom button. With the mouse, drag a zoom window across the figure, and click to enlarge.
  15. With the Fit button at the bottom, you can just fill the screen with the object if it the wrong size.
  16. Close the Pan window.

  17. Help
    Extensive Ansys help is available by clicking the Help menu.

  18. To close Ansys

  19. Watching Your Storage Space (This doesn't work right now)

  20. Assignment
    Using a word processor, make a cover sheet describing what you did with Ansys. Point out how the finite elements are smaller around the holes where the stresses are greater. Discuss element types. Attach the Ansys code and the figure of the bracket with your name and date, and turn in the package as specified at the lab.

  21. Before logging out check the size of your stored files.

Epilogue: In this lesson you learned how to run an Ansys batch program with interesting graphic output. You also learned how to capture the graphic, how to edit it, and how to print it. See my Photo Editing web page for examples of what you can do with photographs.

As with last week's lesson, you are not expected to understand all the Ansys code in Bracket.a. For now, your are learning how to run Ansys learn what it can do and learn a few Ansys commands. Later, you will begin programming Ansys from scratch. (See Assignment 9.)

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Files: Ansys, Matlab, Bash

Revised: March 19, 2004 -- Copyright 1997-2004 ARMiller