Crushable foam Simulation inAbaqus

[jrahul]

Hello ,
I was using the Abaqus to simulate the compression failure behavior of an Interpenetrating Network composite structure consisting of Aluminum and Syntactic foam.

I am trying to input the Hardening curve for the CRUSHABLE FOAM model
as true stress = engineering stress(1+engineering strain)
Plastic Strain = true strain -(true stress /E)

but my model doesnt run for more than 2% strian . It gives an error Message saying : Solution Appears to be diverging Convergence is judged Unlikely
Too many Attempts made for this Increment.

Can you please let me know if I am inputing the hardening data in the right way or are there other problems with simulation as I have 2 different materials

Thank you in Advance for your help,
Rahul

[Jorgen]

Your approach looks OK to me.

The error message that you got can be caused by different problems. Does the simulation work with a different material model? If you run a one element simulation using your material model, does that work?

- Jorgen

[jrahul]

Jorgen,
Thanks for ur reply. I had used the metal plasticity model that is available in Abaqus and it actually runs for 25% strains . But since i was doing the compression tests simulation I was more keen on using the cruhable foam model.
Does it mean that i am not inputing the hardening behaiour in the right way for crushable foam model..Pls. let me knw what u think about this.

Thanks once Again,
Rahul

[Jorgen]

I cannot say for sure, but my guess is that you are not implementing the crushable foam model correctly.