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SSnell

nonlinear material analysis Param cards

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Hi,

 

I want to run a simple model from hypermesh using the nonlinear static nastran solver (106).

I initially ran an inertia relief analysis then took the accelerations in the f06 file and applied them back into the model and placed a three -point constraint and they successfully saw no forces when i ran it in linear static analysis.

 

My problem is that I don't know which param/control cards i need to use to set up the nonlinear material analysis once I've defined my material. Can someone point me at something that might have the answer?

 

Thanks

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Hi SSnell,

 

 Are you running the the non linear material analysis in OptiStruct?

 

If yes, you can use MATS1 to define NL material parameters.You can refer to this tutorial\ in OptiStruct help:

OS-1365: NLSTAT Analysis of Solid Blocks in Contact

 

 

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Optistruct is similar (if not the same) as Nastran for creating cards for material non-linearity.

 

For material non-linearity in Nastran you'll need a MATS1 card which will reference a TABLES1 card.

In the TABLES1 card you input your points for a stress strain curve. The first point after 0,0 must equal the yield stress you've defined in the MATS1 card. Both these cards are easily created from within the Hypermesh program.

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