WHAT DOES VISCOPLASTIC MEAN?

[Fernandez]

I'm modeling (using LS-DYNA) a corrugated plate as a (smooth) plate but with orthotropic properties (for simplification purposes). Now I want to add plasticity to my model and I was suggested to use the material card *MAT_ANISOTROPIC_VISCOPLASTIC.

The problem is that I'm not sure what does "viscoplastic" exactly means?
Does anyone has used it before?
Other modeling approach suggestions?

Thanks,

 

[prost]

Fernandez:
As you can see by the lack of responses to your query, this is a very complicated subject if you don't work in this area regularly. I suggest you do some internet searches for 'Bingham plastic'. I did a lot of work with viscoelastic solids/fluids about 5 years ago, and vaguely recall that viscoplastic materials are similar to viscoelastic, except that viscoplastic materials have a 'flow rule' which essentially means a cut-off stress--the material behaves one way below the cut-off stress, and a different way above the cut-off stress, similar to an 'elastic-perfectly plastic' material, I think.

 

[idly123]

viscoplastic have time dependent deformations, a spring and a dashpot is used to model a viscoplastic material. there are plents of books available. its not complicated at all.
Raj

 

[idly123]

viscoplastic have time dependent deformations, a spring and a dashpot is used to model a viscoplastic material. there are plents of books available. its not complicated at all.
Raj