Thermal stress of a rod or a bar
(Strength of materials – by Er. R.K. Rajput)
α: Thermal expansion coefficient per degree centigrade;
t1: initial temperature of the rod or bar;
t2: final temperature of the rod or bar;
E: Modulus of Elasticity in N/m2
From the above formula, we can calculate the thermal stress of a bar or a rod. For the thermal stress to be less, the thermal expansion coefficient has to be less for a material.When the temperature is raised or lowered in a material, it is subjected to either increase or decrease in its length. With respect to these changes in lengths if t
he stress is calculated, it is called the thermal stress.