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plasticity

plasticity

plasticity

(OP)
I'm doing a plastic analysis ( perfect plasticity ) and I get this warning before the analysis stops

 ***WARNING: THE STRAIN INCREMENT HAS EXCEEDED FIFTY TIMES THE STRAIN
TO CAUSE
             FIRST YIELD AT --- POINTS

 ***WARNING: THE STRAIN INCREMENT IS SO LARGE THAT THE PROGRAM WILL
NOT ATTEMPT
             THE PLASTICITY CALCULATION AT --- POINTS
---------------------------------------------------------------------

Does sobdy know something about that?

bat585

RE: plasticity

Have you tried to reduce the increment size?
If that not work, try to run it with elastic material first to debug any protenial problem.

RE: plasticity

(OP)
all is ok in elastic case

I'll try to reduce the increment and tell you if it's ok...

Thanx

bat585

RE: plasticity

There was a similar post before, and it is helpful. I solved the same problem with slightly increasing the slope of the plastic part.

I hope this helps

RE: plasticity

(OP)
Thank you for answering.

My load is a temperature predefined field, therefore I cannot do like it is suggested in the post you showed me.

I will try with a hardening model like you said.

Thank you !

bat585

RE: plasticity

(OP)
In fact, even if I use an hardening model, those Warnings appear...

I think Abaqus can calculate but uses very short time increments (1e-7)

No way to change that?

bat585

RE: plasticity

if the problem work with small increment. Is that the problem sloved?

I assumed that you have a big area that under plastic, hence big nonlinearity.

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