Ramberg-osgood Umat model

[Thuy3112]

Dear Researchers
I am not good at Umat, and now I am get in stuck in a problem related to that.
Does any one has Abaqus Umat implemented ramberg-osgood equation for soil dynamic problems and could please share with me?
Thanks very much..

 

[FEA way]

Abaqus has a built-in deformation plasticity model based on the Ramberg-Osgood theory. But if you are looking for something more specific to soil dynamics, check the article "Development and application of Ramberg-Osgood soil dynamic nonlinear constitutive model on ABAQUS code" by Q. Hu et al.