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05-25-2016 01:36 AM

I have a set of bushings which have highly nonlinear stiffness (but elastically so). I would like to use nonlinear analysis with a nonlinear force vs displacement curve to get the correct stiffness of these fasteners for use in a natural frequency analysis.

Aside from running a nonlinear solution and manually checking the displacement of each fastener end-point, and then entering the correct stiffness separately for each fastener, is it possible to use nonlinear results to define the stiffness matrix used in a natural frequency analysis in FEMAP?

Solved! Go to Solution.

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05-25-2016 02:30 AM

Hello Kava,

I guess you need to run a pre stresseed modal analysis. There are some issues in internet. What I have it is not in english

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05-25-2016 10:10 PM

You can probably do it as a restart (if you have ticked the analysis option to save data for re-start), but that is more complicated than the method above.

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