Material curve longitudinal and transverse (thermoplastic Polymer)

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

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

<?xml version="1.0" encoding="UTF-8"?>curve.PNG

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2018

    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. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018

    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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