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Nastran Permanent Deformation

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teeder

Automotive
Jul 4, 2007
2
Dear All,

I am a fairly new user for non linear material analysis. I am analyzing an aluminum part, with a static load, and have seemly successfully ran a solution 600,106 model.

The model goes through about 20 steps in about 60 minutes and outputs an .OP2 file that I can post process in Hypermesh. I can post process stress and stain at the last time step which shows areas around 3-4%. The stress is between yield and UTS.

My question is as follows:

I assume that this strain value is at 100% so how do I obtain the strain value or permanent set after the load has been removed? Is this a separate solution or is there another way to obtain the permanent set?

If this strain value is a percentage, weather at 100% load or when the load is removed, how do I obtain a value of permanent set like in (mm)? Do I manually calculate based on the percentage value in that area and the length of elements for the values in that region? Or maybe this is much easier and I am missing some type of post processing in Hypermesh.

Sorry for such a trivial question and thanks ahead of time for your response.
 
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