Can field outputs be customized in ABAQUS for individual materials in a bimaterial specimen?

[Shins Karthikeyan]

I am simulating a tension test of a bimaterial specimen in ABAQUS. I would like to create different field outputs for each material, and I would like to display them in a single contour plot. 
For example, let's say my bimaterial consists of Epoxy and Aluminium.  For Epoxy, I would like to find N=0.5*(S1-S2), where S1 and S2 are the major and minor principal stresses, and for Aluminium, I would like to find N=0.75*(S1-S2). And finally, I want the contour of N. 
Is this doable in ABAQUS?

 

[FEA way]

Good question. I thought that the ODB Reducer/Builder plug-in could handle this but apparently not (it may have some bugs). So it seems that the only way is to use Python scripting to edit the databases (you would need a copy) and combine them.