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BodhiAI
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