Topic: Strength of Materials
A stainless steel rod of diameter 12 mm and length 2.5 m is kept on frictionless surface and heated from 300 K to 400 K. What is the thermal stress on the rod? (coefficient of linear expansion of the steel may be taken as 10^-5 /K; yield strength of steel as 200 MPa and Young's modulus as 210 GPa)
- A. 52.5 MPa
- B. 0.525 MPa
- C. 1 MPa
- D. 0 MPa
Answer: D. 0 MPa
Explanation: Thermal stress is only developed when the thermal expansion or contraction of a body is restricted. Since the rod is kept on a frictionless surface and is completely free to expand, no thermal stress will be induced.