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PRF model - How to model permanent plastic deformation?


Gorjin
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(@gorjin)
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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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Gorjin
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(@gorjin)
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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
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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
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(@gorjin)
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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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