A bar of length 500 mm is fixed at both end and there is a gap of amount Δ at the right end.
The coefficient of thermal expansion is 24 × 10-6 /°C and the modulus of elasticity of the material is 70 GPa. If the temperature is increased by 40°C, then which of the options are correct?1
If Δ = 0.2 mm, then the stress in member is 42.4 MPa
2
If Δ = 0.5 mm, then the stress in member is 0
3
If Δ = 0.5 mm, then the stress in member is 12.2 MPa
4
If Δ = 0.2 mm, then the stress in member is 39.2 MPa