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Constitutive Modeling of PP


fusionrohit
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(@fusionrohit)
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Hello Everybody,

Im starting to work with PP in Abaqus and I dont know which material model is the most suitable to describe its plasticity. Which model do you think would be the best choice to start? Also, Id like to add in a latter stage temperature and strain rate dependence.

Thank you in advance.

Regards, Martn.-

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Jorgen
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I have spent a lot of time modeling PP, but I have not yet published my results for PP. I have attached two papers ([URL= https://polymerfem.com/polymer_files/Bergstrom_Presentation_Simulia_2010.pdf ]paper1[/URL], [URL= https://polymerfem.com/polymer_files/Three_Network_Model_2010.pdf ]paper2[/URL]) that illustrate some material modeling work I have done on PC and PE.

In short, I recommend the [URL= https://polymerfem.com/content.php?10-PolyUMod ]Three-Network[/URL] (TN) model for PP. It can accurately capture the non-linear viscoplastic response, include temperature and strain-rate dependence.

-Jorgen

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fusionrohit
Posts: 7
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(@fusionrohit)
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Joined: 11 years ago

Thank you very much Jorgen.

Now Im dealing with a very simple situation. I tried to add temperature and strain dependence to an elastic material model but it turned out that Im only allowed to introduce temperature dependence. Does anyone know if theres any way of taking into account strain rate dependence in an elastic material?
(I know this situation means a definitions conflict but now I need something as simple as modeling the dependence of the elastic constants with T and strain rate)

Thanks in advance, Mart.-

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Jorgen
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No, you cannot really make an elastic material model strain-rate dependent. What you need is a viscoelastic/viscoplastic material model instead.

-Jorgen

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