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Referring to the equation provided for the drawing force in the case where friction is not negligible, explain how the coefficient of friction and the die angle affect the drawing force.Frictionless: F = Yavg Af ln(A0 / Af)w/Friction: F = Yavg Af [(1 + mu/alpha) ln(A0/Af) + 2/3 alpha]Yavg = average stressA0, Af = initial and final areamu = coefficient of frictionalpha = die angle
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