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RobertPetersen1-Visitor
1-Visitor
October 9, 2012
Question

Force-deflection Curve

  • October 9, 2012
  • 3 replies
  • 3956 views

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.


Thanks,


Bob Petersen


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3 replies

R
randyspeed1-Visitor
1-Visitor
October 9, 2012
Bob,

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;

1. MECHANICA Motion (MDO, MDX)
2. Large deflection analysis (MECHANICA Structure)
3. Contact analysis (MECHANICA Structure)

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.

Randy Speed
(214) 213-4440 cell phone
Speed Consulting, LLC
(800) 256-7140 ph and fax
www.speedconsulting.com

P
ptc-3801071-Visitor
1-Visitor
October 9, 2012
To all,

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.

Best Regards,


Greg Saiter
ABB Inc.
579 Executive Campus Drive
43082-8870, Westerville, Ohio, UNITED STATES
P
ptc-3801071-Visitor
1-Visitor
October 9, 2012
As a follow-up I was going to include one I did.

Here is it for you to see:





Greg Saiter
ABB Inc.
579 Executive Campus Drive
43082-8870, Westerville, Ohio, UNITED STATES
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