- #1
tsukuba
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Homework Statement
What force is required to punch a 20-mm-diameter hole in a plate that is 25 mm thick? The shear strength is 350 MN/m2.
Homework Equations
σ = V / A
The Attempt at a Solution
The first thing I did was rearrange the formula to isolate for V.
I got the area which (A=πr2) gave me 314.15mm2. I change that to m and then I wne ahead and calculate the force which gave me 110.11 MN
But the answer is 549.8 kN ( they multiplied 20x25xπ to get the area)
Not sure where I am going wrong.