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# 2-1.39 - PR-1 A 1l8-in diameter punch is used to cut blanks...

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Unformatted text preview: PR -1 A 1l8-in. diameter punch is used to cut blanks out of a 1I16-in. thick plate of aluminum. If an average shear stress of 20,000 psi must be induced in the plate to create a blank, what force F must be applied? F B Dia ra '1/16 in. rad. .‘ SOLQIIQH: The average shear stress in the material to be punched will be exerted around the entire cylindrical area which is left after the hole has been punched. The cylindrical area for this process is: A = 21m = 2 1: (1/16 in)(1l16 in) A = 0.0245 in 2 The force required to produce the needed average shear stress is: P = 1m A = (20,000 lbﬁn2)(0.0245 inz) ANS P = 439.3 lb ...
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