Entering stress-strain diagram for compression and tension 1

[compabaq]

Hi guys,

I would like to enter the entire stress-strain diagram of a plastic. This diagram is different in uniaxial compression and tension. I have the entire stress-strain diagram available for both, and I'm not worried about what happens in the other directions when the material yields. I do not want to create two separate materials in my simulation, as this workaround would not work for me (because I can't predict exactly where compression and tension will occur).

How should I implement this in Abaqus?

Kind regards,
Comp

 

[compabaq]

No one that can help me?

 

[Mustaine3]

I think cast iron plasticity can have different properties for tension and compression.

 

[compabaq]

Thank you Mustaine3. I will give that a try.

The disadvantage for my problem is that cast-iron plasticity only works for isotropic materials. My material is in principle anisotropic. Any ideas for anisotropic materials?

 

[Mustaine3]

I'm not familiar with these kinds of materials. Check the users manual regarding the available options. If nothing appropriate exists then you could write a UMAT.

 

[mrgoldthorpe]

Have you tried combined/kinematic hardening (*PLASTIC, HARDENING=COMBINED.. and *CYCLIC HARDENING in ABAQUS old money)?

Agreed, it's mainly for metal plasticity but perhaps worth a try.

You could quickly use a single element model to attempt to fit its behaviour to your test results, particularly if you have reverse loading results.

Just a thought

MRG