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torged to 5 mm × 1.25 mm × 25 mm under plane-strain compression. Sticking friction can be assumed at the die-workpiece contact. Also assume a constant flow stress of 50 MPa. (a) Find the force necessary to achieve this deformation. (b) Find the work required (remember that work = fFdh, and that F changes with h in this case). (c) Compute the efficiency factor η.

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