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Franz_M

Material curve longitudinal and transverse (thermoplastic Polymer)

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Hello,

 

on your opinion, what kind of material formulation could be the best for the material described by the attached graph?

Considering we want to apply on the structure  a static load case and the material is a Thermoplastic Polymer.

I'm using Optistruct solver

 

thank you

curve.PNG

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Hi @Franz_M

 

What are all material properties you have?

 

If you just have linear properties and stress-strain curve, you can use MATS1 in OptiStruct to define material non-linearity and use NLSTAT analysis type. 

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The other given material properties values are:

image.png.7d5d8ffa45f7d3df76410b5649dc8458.png

image.png.cc46c1dfaabb2c5152281e79ea1d01f9.png

 

I had to suppose 0.35 as poisson ratio, that is missing as you can see.

 

I tried to use MATS1, as you suggest, with "non-linear quasi-static" as analisys type.

 

In this forum, I've seen in other similar topic, so on that base:

I have created a stress-stain curve as TABLES1,  so that curve is the TID for MATS1.

In MATS1 card I have choosen "PLASTIC" as Type and "0" as TYPSTRN.

 

In order to create the curve I had to modify the experimental curve to avoiding negative slope or increasing slope (else I obtained erros during the model RUN)

So the curve I could use is the green one in the follow graph:

image.png.1aab50cfd142cee188293c531bb7d047.png

 

I think this is the simpiest way to execute the analisys by an implicit code. Do you think it is correct? 

 

I think material supplyer omitted the poisson ratio, because he gives tranversal values, are there a way to implement these values?

 

 

I hope I didn't make mistakes and the explanation shoul be  clear

 

thank you

 

 

 

 

 

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