A steel rail is 12.6 m long and is laid at a temperature of 24°C. The maximum temperature expected is 44°C. Estimate the minimum gap to be left between two rails so that temperature stresses do not develop.
Take E = 2 × 105 MN/m2 and α = 12 × 10-6/°C1
1 mm
2
2 mm
3
3.1 mm
4
4.2 mm