At the moment, I have been working on a model where I must place successive layers at a certain time properly. I should place layers of a material one on top of the other in a construction process, that is, in the placement every layer spends fixed time to finish the stage. It is similar to the typical model that is carried out in geotechnics which is the construction of an embankment, which is built in stages at determined times and then we can see in the results such as: the variation of the stresses, pores pressure and displacements.
I have the 5.5 version where it has the activation or desactivation material function, at the moment, it works nice in the stacionary but I need to work in time dependent.