+1 vote
in Machine Dynamics by (34.3k points)
A machine punching 38 mm holes in 32 mm thick plate requires 7 N-m of energy per sq. mm of sheared area, find the maximum shear force required.

(a) 26.7 kN

(b) 53.4 kN

(c) 13.35 kN

(d) 106.8 kN

I had been asked this question at a job interview.

Asked question is from Flywheel in a Punching Press in section Turning Moment Diagrams and Flywheel of Machine Dynamics

1 Answer

0 votes
by (38.6k points)
Correct answer is (a) 26.7 kN

Easy explanation: Given: d = 38 mm; t = 32 mm; 2 E1 = 7 N-m/mm of sheared area

A = π.38.32 mm^2

F = 7.A N = 26.7 kN.

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