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PRF model - How to model permanent plastic deformation?

 
Thermoplastics Modeling
Last Post by Jorgen 2 years ago
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 Gorjin
Topic starter
Apr 19, 2021 8:57 am
(@gorjin)
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Joined: 2 years ago

Hi,

I am testing the PRF models with long relaxation time. My goal is to make a material model for Abaqus that can function under as many load conditions as possible.

Network 0 will always return the test specimen to original shape if all boundary conditions are released. Is there some way to include plasticity in network 0 in Mcalibration? It is the principle that there is no permanent deformation that is bothering me.

Do you have an explanation why plasticity is not an option for network 0?

/Christian

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PRF MCalibration material model
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Posts: 8
 Gorjin
Topic starter
Apr 19, 2021 11:40 am
(@gorjin)
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Joined: 2 years ago

I have a test where I can obtain plastic data for three different stresses so I would ideally want to add my plastic strain to network 0.

/Christian

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 Jorgen
Apr 20, 2021 11:50 am
(@jorgen)
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Joined: 4 years ago

That data looks great. If you share your data, then I would be happy to test a few models for you. It is not always necessary to include plastic strain in network 0 in order to capture the data that you show in the image.

/Jorgen

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 Gorjin
Topic starter
Apr 22, 2021 3:33 pm
(@gorjin)
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Joined: 2 years ago

I can send over some data. I am not comfortable to attach it here for everyone at the moment. The data is not that special but what plastics we use is probably company confidential in some way.

I think that plastic deformation in network0 also will help a lot with long term stresses. I will put together something that I can send over next week.

I would be happy if there was something like a Johnson-Cook plastic model for network 0. The optimization could be done with some (2-5?) data points. I know Johnson-Cook does not work with hyper-elasticity at the moment but it could be transformed to basic table values. 

/Christian

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 Jorgen
Nov 12, 2021 1:41 pm
(@jorgen)
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Joined: 4 years ago

If you like, just send me the data by a private email.

/Jorgen

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Topic Tags:  PRF (5) , MCalibration (20) , material model (21) ,
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