ABAQUS analysis with Mohr Coulomb Plasticity 1

[Ingeniosus]

Hi everybody!
I'm trying to analyse a RC shell plate with a Mohr Coulomb Plasticity model but ABAQUS returns me this error:

*PLASTIC REQUIRES THE USE OF *ELASTIC, *HYPERELASTIC OR *HYPERFOAM
Error in job JobStaticoPiastra4: THE MATERIAL OPTIONS *CAP PLASTICITY, *CAST IRON PLASTICITY, *CLAY PLASTICITY, *CONCRETE, *CONCRETE DAMAGED PLASTICITY, *DRUCKER PRAGER, *FOAM, *CRUSHABLE FOAM, *MOHR COULOMB, *JOINTED MATERIAL AND *PLASTIC ARE MUTUALLY EXCLUSIVE
Error in job JobStaticoPiastra4: 400 elements are missing elastic property reference. The elements have been identified in element set ErrElemMissingElasticPropRef.
Job JobStaticoPiastra4: Analysis Input File Processor aborted due to errors.
Error in job JobStaticoPiastra4: Analysis Input File Processor exited with an error.
Job JobStaticoPiastra4 aborted due to errors.

In the PROPERTIES I have defyned the material CONCRETE with only the MOHR COULOMB PLASTICITY model. I have also defined REBARS in the SECTION definition.
I can't understand what is missing. Can anyone help me?

Thank you

 

[mechfeeney]

Did you define your density and elasticity properties in addition to your mohr coulomb plasticity properties? Density is under General Tab and Elasticity is under Mechanical. Now with Mohr Coulomb Plasticity, you have to define properties for the material behavior BEFORE plasticity. I'm not an expert in concrete, but in metals, for example, if one were to do a plasticity simulation he would have to define the plastic properties and the elastic. Your warning is suggesting that you did not define your Elastic properties, and, apparently you could define either Elastic, Hyperelastic, or Hyperfoam (not all three...just 1).

 

[Ingeniosus]

Thank you for your post.
I defyned ELASTIC properties but the error message is:


Job Job-1: Analysis Input File Processor completed successfully.
Error in job Job-1: *MOHR COULOMB NOT ALLOWED IN PLANE STRESS
Job Job-1: Abaqus/Standard aborted due to errors.
Error in job Job-1: Abaqus/Standard Analysis exited with an error - Please see the message file for possible error messages if the file exists.
Job Job-1 aborted due to errors.

I'm using a SHELL PLATE element in a 3D SPACE of model to reproduce a CONCRETE SLAB. Why can't I use a Mohr Coulomb Plasticity model for a SHELL element?

Thank you

 

[mechfeeney]

READ:

http://www.eng-tips.com/viewthread.cfm?qid=215209&page=71

 

[Ingeniosus]

Thank you! I will try this.

Regards

 

[Ingeniosus]

On the Abaqus Analysis Manual there is:

"The Mohr-Coulomb plasticity model can be used with any stress/displacement elements in Abaqus/Standard other than one-dimensional elements (beam and truss elements) or elements for which the assumed stress state is plane stress (plane stress, shell, and membrane elements)."

Also, I tried to change the Element type (to use a PLANE STRAIN element with a SHELL PROBLEM) but I can't do it because in the MESH module --> ELEMENT TYPE you can only change from LINEAR to QUADRATIC element.

So you can't use MOHR COULOMB PLASTICITY with SHELL ELEMENT I suppose...

Thanks