Question

A 3m long steel bar has a diameter of 80mm .it’s is stretched with a force of 30 kN and extends by 0,4 mm calculate the stress of the steel bar

Answer 1

The stress of the steel bar is 5.97 N/mm^2.

Step-by-step explanation:

To calculate the stress of the steel bar, we can use the formula:

stress = force/area

where force is the stretching force applied to the bar and area is the cross-sectional area of the bar. The cross-sectional area can be calculated using the diameter of the bar as:

area = π/4 * diameter^2

Substituting the given values, we get:

area = π/4 * (80mm)^2 = 5026.55 mm^2

(Note that we converted the diameter to millimeters to keep the units consistent.)

Now, we can calculate the stress as:

stress = force/area = 30 kN / 5026.55 mm^2 = 5.97 N/mm^2