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Axisymmetric Cylinder, click to enlarge

MENG 421 Assignment 4

Ansys Axisymmetric Cylinder

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Lecture notes -- Milestones 1 2 NGEN, Plane42, Plane82,
Axial node numbering, Ansys code | Radial node numbering, Ansys code
Element 1, Elements 1-6, Element 1-12, Cylind1.a,
Load Wrong, OK  

In Lesson 2 you found the deflection and stress in a cylindrical body by using the Ansys Pipe16 element. For today's lesson you will find the deflection and stress in a cylindrical body by another method. You will use the Ansys Plane42 element in axisymmetric mode. With this method you define a planar shape that is revolved about the y axis. You can make many shapes in this way. For example, a rectangle generates a cylinder when rotated about the left edge, and a pipe if the axis is offset to the left. A trapezoidal shape can produce a conical nozzle. Learn more from the Ansys help files by searching for plane42 and also axisymmetric.

You will also learn more about the Ansys N, E, and FILL commands and the NGEN and EGEN commands for creating a set of elements and you will create a two-dimensional section that Ansys rotates about the Y-axis to generate the cylinder. You will use the 2D, 4-node Ansys element PLANE42 with the axisymmetric option. Since you only define a two-dimensional array of elements, the Ansys plot only shows the 2D cross-section of half the cylinder. The cylinder is deformed by loading the top surface is the while the bottom surface is constrained.

Today's lesson is in two parts. First you will use a short file Cylind1a.a to create just the 2D array in stages by adding keyboard commands. Then you will change to the complete file Cylind1.a to solve the problem. For both files, you will make changes with editor before running Ansys. For the complete second file, copy the output data to the end of the Ansys file, and print out both the Ansys file and graphic shown above.

  1. Getting started
    Before going any further, do the four things you learned in Assignment 2: check the screen resolution, check the size of your stored files, clear the Recycle Bin, and clear the Temp folder.

  2. Copying the two Ansys files.
    Copy the two files: cylind1.a and cylind1a.a from class files page as you have done before.

  3. Editing the first Ansys file cylind1a.a.

  4. Editing the second Ansys file cylind1.a.

  5. Running cylind1a.a with Ansys
    In this section you will run the short file with Ansys in batch mode to create the first element. Then you will type two Ansys EGEN commands to create the remaining elements.

  6. Running cylind1.a with Ansys
    In this section you will run your edited Cylind1 file with Ansys. This will create the complete figure and calculate the deflections of the nodes.

  7. Reduce the figure size and slide it over the title

  8. Capture your figure with IrfanView as you did in Assignment 3. Make the usual changes with the photo editor (reverse, gray scale, transparent), then print it.

  9. Animate the figure with the following steps.

  10. To see a 560KB animation of the deformation: Axisymmetric Cylinder, click to enlarge

  11. Make a 3/4 oblique view of the complete cylinder and animate it.

  12. To see a 560KB animation of the oblique view:

  13. Pasting the deflection data to your Ansys File
    In this section you will copy the calculated deflections to your Ansys file and then print it.

  14. Assignment
    Using a word processor, make a cover sheet describing what you did. Solve the problem exactly with a 20kip point load (Displacement = PL/(AE)) and compare with the Ansys solution, giving the percent error. Include a discussion of the axisymmetric method. Attach the Ansys code with displacement at the bottom and include the graphics figure with your name and date. Turn in the package as specified at the lab.

  15. Before logging out check the size of your saved files.

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Files: Ansys, Matlab, Bash

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