GATE 2023 II Thermal Stresses II Quiz 22

A steel rod is heated from 30° to 80°C and free expansion of rod is allowed while heating. If coefficient of exposition is 1.2 × 10^–5 per °C and E = 110 GN/m², then thermal stress developed in material is.

For any given material, the thermal stress is function of:

1) Coefficient of linear function

2) Modulus of elasticity

3) Temperature rise

Which of the following is/are correct?

A bar of length 3 m is fixed at both the ends as shown in figure initial stress in bar is 30 MPa (Tensile) is induced at 15°C. The total stress (MPa) in bar if temperature is raised by 20 K. Take .

When the temperature of a fixed bar is increased, the stress induced in the bar is ______.

A circular bar rigidly fixed at its both ends uniformly taper from 150 mm at one end to 100 mm at the other end. If its temperature is raised through 30K, what will be maximum stress developed in the bar.
[Take E as 200 GPa and as for the bar materials]