Sept. 23, 2019

Work done in Stretching wire:

In stretching a wire work is done against internal restoring forces. This work is stored in the wire as elastic potential energy or strain energy.

A and stretches it by x then



Dividing both sides by volume of the wire we get energy stored in unit volume of wire.



[As AL = volume of wire]

Thermal energy density = Thermal energy per unit volume = 12  Thermal stress x strain