Re: [Yade-users] [Question #699346]: How to simulate the material with big elastoplastic property such as PLA

2021-11-05 Thread Wang Benxin
Question #699346 on Yade changed:
https://answers.launchpad.net/yade/+question/699346

Wang Benxin posted a new comment:
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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Re: [Yade-users] [Question #699346]: How to simulate the material with big elastoplastic property such as PLA

2021-11-05 Thread Robert Caulk
Question #699346 on Yade changed:
https://answers.launchpad.net/yade/+question/699346

Status: Needs information => Answered

Robert Caulk proposed the following answer:
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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Re: [Yade-users] [Question #699346]: How to simulate the material with big elastoplastic property such as PLA

2021-11-05 Thread Wang Benxin
Question #699346 on Yade changed:
https://answers.launchpad.net/yade/+question/699346

Wang Benxin posted a new comment:
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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Re: [Yade-users] [Question #699346]: How to simulate the material with big elastoplastic property such as PLA

2021-11-05 Thread Robert Caulk
Question #699346 on Yade changed:
https://answers.launchpad.net/yade/+question/699346

Status: Open => Needs information

Robert Caulk requested more information:
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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[Yade-users] [Question #699346]: How to simulate the material with big elastoplastic property such as PLA

2021-11-04 Thread Wang Benxin
New question #699346 on Yade:
https://answers.launchpad.net/yade/+question/699346

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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