1. The problem statement, all variables and given/known data Show how a constant interfacial shear stress mk < k decreases the forces required for uniaxial upsetting using mohr circles with decreasing m (<1). Assume a slab force balance. 2. Relevant equations Mohr Circle Equations dσx/dx = 2mk/h σx + P = 2k 3. The attempt at a solution Attached. What I have shows what the question asks but I'm not sure I did it right.