Question

Determine the load required to punch a $20mm$ diameter hole in a $2mm$ thick sheet. The properties of the material of the sheet are:
Tensile strength $-580MPa$
Yield strength in tension $-410MPa$
Shear strength $-350MPa$
Yield strength in shear $-250MPa$
The load is $kN$ is

• A. $31.40$
• B. $43.98$
• C. $64.40$
• D. $91.10$

Answer 1

The correct option is B $43.98$

Punching force $=\pi dt\tau$
$=\pi \times 20\times 2\times 350=43.98$ kN