Question

The shear strength of a sheet metal is $300$ MPa. The blanking force required to produce a blank of $100$ mm diameter from a $1.5$ mm thick sheet is close to

• A. $45$ kN
• B. $70$ kN
• C. $141$ kN
• D. $3500$ kN

Answer 1

The correct option is C $141$ kN

Blanking force = Shear strength$\times$Shear area
$=300\times {10}^6\times \pi \times 100\times 1.5\times {10}^{-6}$ $=141.37kN$