Refresh my memory of how to show a force vs, deflection graph using measures in Mechanica. I haven't done this since about 2006, and things have changed since then.
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Since linear static analysis does not step the load and deflections are linear wrt applied load, the theoretical load vs deflection curve is a straight line and not available in linear static. Three other areas come to mind regarding your question;
Since Motion deals with rigid bodies, perhaps you are referring to contact or large deflection in Structure. I have not checked to see if an actual load vs deflection curve can be generated for results of these types of analyses, but the load is indeed stepped for these two types of analyses. Try defining a measure first of deflection (either at a point, or maximum over model), then graphing measure vs load step.
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I have done a few of these and this is the procedure I use:
1. Set up parameter FORCE. 2. Redefine your loads by edit definition and in the load dialogue box insert the parameter name FORCE in the X,Y,or Z direction, whichever applies. 3. Instead of a linear static analysis choose to do a "New sensitivity Design Study" 4. In the dialogue box pick you analysis name and in the variable box on the right hand side pick the box for parameters. This will allow you to pick the parameter "FORCE" that you created. 5. Once you pick force, it will give you the lower and upper limits that you are allowing, say 0 to 3000 LBF 6.Now RUN the sensitivity study. 7. Now go to the Results dialogue box and pick the Design study at the top. 8. In Display type pick "Graph" 9. Just below the Measure box, Pick the measure you want, in your case you want displacement (I set my own personal measure which shows up in the USER DEFINED on the right" 10. Click OK and SHOW and you will see your graph of force vs. deformation.
I was using CREO 2.0 but I think the picks are mostly the same.
Let me know if it works.
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