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In a cold-rolling process, estimate the roll force and power required for a 4135 annealed steelstrip of 200 mm wide and 10 mm thick to be rolled to a thickness of 6 mm. The roll radius is 200mm and the roll rotates at 200 rpm. Assume a coefficient of friction of 0.1.Assume that the workpiece material is 4135 annealed steel with a yield stress of 750 MPa and the true stress-strain relation (strain hardening relation) of 𝜎 = 1150*𝜀^0.18 at room temperature.
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