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How to simulate the material with big elastoplastic property such as PLA

Asked by Wang Benxin

I am simulating the material with big elastoplastic property. The stress-strain curve of the material has the normal elastic characteristic, but it will tend to be stable after the yield stage showing that it has a big plastic characteristic and there is not a strain softening stage. The material is just like PLA. My question is what material and constitutive law are supposed to be used properly. Is there any example for it?

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Robert Caulk (rcaulk) said : 		#1

Hello,

>>stable after the yield stage showing that it has a big plastic characteristic and there is not a strain softening stage. The material is just like PLA

I don't quite understand. What is "stable after the yield stage". Do you mean the material should be perfectly plastic? I guess yes, because you say "no strain softening."

What is "big plastic characteristic?" Can you describe that a bit more technically? "big", "small" what does it mean? are those relative values to some other behavior?

What is "PLA?"

Cheers,

Robert

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Wang Benxin (yushujinshan) said : 		#2

Hi Robert,

Thank you for your interest in my question.

>>I don't quite understand. What is "stable after the yield stage". Do you mean the material should be perfectly plastic? I guess yes, because you say "no strain softening."

Yes, you are right. The material is perfectly plastic. Its property is like the Fig.9 in the literature https://link.springer.com/content/pdf/10.1007/s10409-015-0524-4.pdf

>>What is "big plastic characteristic?" Can you describe that a bit more technically? "big", "small" what does it mean? are those relative values to some other behavior?

"big", "small" are use to describe the behavior of the material like 'perfectly' you said.

>>What is "PLA?"

'PLA' is the polylactic acid. https://sv.wikipedia.org/wiki/Polylaktid

Cheers,
Benxin

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Robert Caulk (rcaulk) said : 		#3

Hello,

>>'PLA' is the polylactic acid. https://sv.wikipedia.org/wiki/Polylaktid

I am unaware of any contact models in yade which were designed particularly for plastic materials. However, CohFrictMat does allow for perfectly plastic behavior with fragile=True [1].

Cheers,

Robert

[1]https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.CohFrictMat.fragile

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Wang Benxin (yushujinshan) said : 		#4

Hi Robert,

I think this would be of great help for the problem. And I'd like to try.

Thanks and best regards,
Benxin

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