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Parti BASIC METHODS
Principal Stresses and Yielding
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accurate angle annealed applied approximation assumed billet calculations centre-line Chapter coefficient of friction cold-rolling component considered constant cross-sectional area dead zone determined diagram diameter drawing stress drawn elastic element equal equilibrium example exit extrusion factor force forging frictionless given gives hodograph homogeneous deformation hydrostatic pressure increase indentation length lubricant mandrel mean yield stress Mech metal metalworking method mild steel mill Mohr circle obtained operation parallel pass plane plane-strain plastic deformation plastic zone platens predicted principal stresses produced punch radius ratio reduction of area redundant roll gap roll load rotation round bar shear stress shown in Fig slip-line field solutions sticking friction strain strain-hardening stress evaluation stress system stress-strain curve stresses acting strip thickness strip-drawing surface tangential temperature tensile stress tensile test tension ton/in2 tons tube upper-bound solution usually velocity voltage width wire wire-drawing work-hardening workpiece zero