 Ask Remember Me? Yusf Posts: 197, Reputation: 3 Junior Member #1 Aug 19, 2015, 12:52 AM
Difference between 0.5×stress×strain and 0.5×k×e²
In my book, energy stored in a stretched spring or work done in stretching a spring is given as E=0.5ke²

On another page, it is given "you can calculate the energy stored per unit volume as energy=0.5×stress×strain"

Both seem same to me. Is it so? ebaines Posts: 12,130, Reputation: 1307 Expert #2 Aug 19, 2015, 05:17 AM
They are related, but not exactly the same. Note that the units of the first equation is energy, which is measured in Newton-meters, or N-m. The second equation is in units of energy per unit volume, or N-m/m^3. So to calculate total potential energy given stress and strain you must multiply by the volume of the object (area times length). Yusf Posts: 197, Reputation: 3 Junior Member #3 Aug 19, 2015, 05:36 AM
Understood. Thanks!

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