14. Double click on the “Loads” node in the model tree
a. Name the load and select “Concentrated force” as the type b. Click “Continue…”
c. Select the point along the top beam near the corner, Click “Done”
d. Set “CF1” to 0 and “CF2” to -996.389 e. Click “OK”
©22011 Hormoz Zare
©2011 Hormoz Zareh & Jenna Bell 10 Portland State University, Mechanical Engineering
16. In the toolbox area click on the “Seed Part” icon
h. Enter 0.08 for “Approximate global size” , click “OK”
17. In the toolbox area click on the “Mesh Part” icon, Click “Yes”
18. Expand the History Output Requests node in the model tree, and then right click on H-Output-1 (H-Output-1 was automatically generated when creating the step) and select Delete
19. Double click on the History Output Requests node i. Name the history and select “Continue…”
j. Set the domain to “Sets” and select the set created above k. Leave the frequency set to every increment (n=1)
l. For the output variables select the U2 displacement
©2011 Hormoz Zareh & Jenna Bell 11 Portland State University, Mechanical Engineering
20. In the model tree double click on the “Job” node a. Name the job “frame_buckle”
b. Give the job a description
©2011 Hormoz Zareh & Jenna Bell 12 Portland State University, Mechanical Engineering
21. In the model tree right click on the job just created and select “Submit”
m. While Abaqus is solving the problem right click on the job submitted, and select “Monitor”
n. In the Monitor window check that there are no errors or warnings i. If there are errors, investigate the cause(s) before resolving
ii. If there are warnings, determine if the warnings are relevant, some warnings can be safely ignored
iii. In the far right column, note how Abaqus adjusted the increment
©2011 Hormoz Zareh & Jenna Bell 13 Portland State University, Mechanical Engineering
22. In the model tree right click on the submitted and successfully completed job, and select “Results”
23. Display the deformed contour of the (Von) Mises stress a. In the toolbox area click on the following icons
i. “Plot Contours on Deformed Shape”
b. Note that when including the effects of geometric nonlinearities, the deformation scale factor defaults to a value of 1
24. Click on the arrows on the context bar to change the time step being displayed a. Click on the three squares to bring up the frame selector slider bar
©2011 Hormoz Zareh & Jenna Bell 14 Portland State University, Mechanical Engineering
25. On the results tree, expand the History Output node and double click on the displacement history created
a. Notice that displacement it plotted against Arc Length, not Load or Load Proportionality Factor.
b. To plot load against displacement, we will need to extract the values for Load and displacement from the Field Outputs.
26. In the Toolbox area click on the “Create XY Data” icon
a. Choose “ODB field output” for “Source” and click “Continue…”
b. On the “Variables” tab
i. Select “Unique Nodal” for “Position”
ii. Expand “CF: Point loads” and select “CF2”
iii. Expand “U: Spatial displacement” and select “U2”
©2011 Hormoz Zareh & Jenna Bell 15 Portland State University, Mechanical Engineering
c. Select the “Elements/Nodes” tab
iv. Select “Node Sets” for “Method”
v. Select the set created earlier “Top”
©2011 Hormoz Zareh & Jenna Bell 16 Portland State University, Mechanical Engineering
d. Click “Save”, then “OK” on the next window
e. Click “Dismiss” on the “XY Data from ODB Field Output” window 27. Expand the “XY Data” node on the results tree.
a. There should now be two sets of data under the node as shown.
b. Double click the “XY Data” node
c. For “Source” select “Operate on XY data”
d. From the “Operators” list select “combine(X,X)”, It should appear in the expression box at the top of the window.
vi. The combine(X,X) operator combines two sets of saved XY data
vii. The Y values of the first argument become the X values of the new XY data viii. The Y values of the second argument become the Y values of the new XY data
ix. The values are combined wherever the X values of the two arguments align
x. For more detail see “Abaqus/CAE User’s Manual” section 45.4.39, “Combining two X-Y data objects”
©2011 Hormoz Zareh & Jenna Bell 17 Portland State University, Mechanical Engineering
e. Select “U:U2 P1: PART….” From the “XY Data” section and click “Add to Expression”
f. Select “CF:CF2 PI: PART….” From the “XY Data” section and click “Add to Expression”
g. Since the load and displacement both increase in the negative direction, they need to be multiplied by -1 to make load and displacement increase in the positive direction.
h. The final expression should look like:
i. Click “Save As…”, name it “load-displacement”, click “OK”
j. Close the “Operate on XY Data” window
28. Right click on “load-displacement” under the “XY Data” node and select “Plot”
k. The buckling behavior can be seen in the plot.
©2011 Hormoz Zareh & Jenna Bell 18 Portland State University, Mechanical Engineering
29. This data can also be copied into Excel or other programs.
l. Right click on “load-displacement” under the “XY Data” node and select “Edit”
m. Select all the data in the edit window, right click and choose “Copy”
n. Open Excel, right click in an empty cell and choose “Paste”
©2010 Hormoz Zareh 1 Portland State University, Mechanical Engineering