How to model foam material and what type of analysis should be performed?

Altair Forum User

I want to model a head rest. Three different static load cases should be considered for this analysis.

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These are the inner components. As you can see there is a foam that should be considered in the analysis. My question is in regards to modelling this foam.

 

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1. Can I do this analysis with optistruct, Geometric non linear analysis(impl static) ??

2. What kind of material should I use for the foam. The foam is Density Polyurethane foam. I don't have the stress strain curve yet but the customer is going to provide us the curve.

 

3. I have another question regarding the screw attachments. May I use two RBE2, one for outer surface of screw and one for the inner surface of the hole (use the independent node of one of RBE2 s for defining the second RBE2) is that correct?

 

I appreciate your help in advance

Altair Forum User

Hi,

 

You can use MATX70, MATX33, MATX21 for Polyitherane foam.

 

3) Yes you can use RBEs at the top and bottom surfaces for Screw/bolt attachments.