Question

A hydraulic press is used to produce circular blanks of $100mm$ diameter from a sheet o $2mm$ thickness. If the shear strength of the sheet material is $400N/m{m}^2$, the force required for producing a circular blank is

• A. $8kN$
• B. $25.13kN$
• C. $31.42kN$
• D. $125.66kN$

Answer 1

The correct option is B $25.13kN$

Punching force $=\pi dt\tau$
$=\pi \times 2\times 10\times 400=25.13kN$