plasticity

[Bat585]

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

 

[Yoman228]

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.

 

[Bat585]

all is ok in elastic case

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

Thanx

bat585

 

[bilim1]

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

 

[bilim1]

thread799-138051

This is the post I was talking about.

 

[Bat585]

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

 

[Bat585]

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

 

[Yoman228]

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.