Punch / Shear Force
Punching force from the cut perimeter (round, rectangular, or entered directly), material thickness, and shear strength: F = perimeter x T x shear strength, in pounds and US tons, with an estimated stripping force (first-principles shear).
Formula and source
Cut perimeter (pi x D round, 2(a+b) rectangular, or entered); force F = perimeter x T x shear strength; tons = F / 2000; stripping ~= 3.5% of F.
Punching force as sheared area times shear strength - first-principles as in Machinery's Handbook (Industrial Press), by name; public domain.
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