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Bergstrom Boyce model for thermoplastics

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Posts: 11
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(@dvhudson08)
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Joined: 12 years ago

I was wondering if there is a way to use BB model to simulate thermoplastics. If yes then how to account for poisson ratio? Will it be via Incompressibilty parameter d?

Thanks!

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Posts: 3998
(@jorgen)
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Joined: 5 years ago

Yes, you can try to use the BB model also for thermoplastics. There is nothing fundamentally wrong about it, the only downside is that it typically does not capture the yield evolution very accurately. For that you will need a multi-network model (like the [URL= http://polyumod.com/material_models ]Three Network Model[/URL]).

The Poissons ratio is controlled by the parameter d.

-Jorgen

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Posts: 11
Topic starter
(@dvhudson08)
Active Member
Joined: 12 years ago

Thank Dr Bergstrom for replying! In order to accurately take into account the Poissons ratio, do I need to include lateral strain in the exp data as well? Can MCalibration take that into account while curve fitting?

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Posts: 3998
(@jorgen)
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Joined: 5 years ago

You have two options in MCalibration:

[LIST]

[*]Specify a constant Poissons ratio that is based on experimental data.

[*]Provide the transverse strain as a column of the experimental data file.

[/LIST]

MCalibration will then try to calibrate the material parameters to match stress-strain data [B]and[/B] the Poissons ratio info.

-Jorgen

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Posts: 11
Topic starter
(@dvhudson08)
Active Member
Joined: 12 years ago

Thanks Dr Bergstrom!

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