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(a)For punching operation, requirement of power:
Maximum shear force=Sut*Area =471238.9 N
Energy required per stroke=4712.389 Nm
Total energy required per minute=117809.72 Nm
Power of Motor=2181.66 W
(b)Energy stored in flywheel:
=4241.15 Nm
Out of this,5% is supplied by arms and hub, and 95% by rim
mr=185.791 kg
(c)mr=pi*Dm*t*b*rho
For rectangular rim, b=2t=0.114 m and t=0.057 m
Checking for stresses,
St=rho*V^2=1.57Mpa, which is less than 6Mpa, hence safe.
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