Dear all:

I am pretty interested in the stress fields in hoppers. I have read a lot about initial and flow stress fields. I already solved the differential equation for the initial stress fields (this solution involves a parameter that depends on the compressibility of the material). On the other hand, I know that for the flow case, it is necessary to use the Second Newton's Law to Enstad elements.

Can someone tell me where can I get information about it? ■