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Why does 1/2 * stress * strain equal the energy stored per unit volume in a wire?

  1. Jan 6, 2012 #1
    I have tried it and the units end up being Nm^-2 (the unit of stress) however the unit for joules is Nm.
  2. jcsd
  3. Jan 6, 2012 #2
    How do you work this out?

    Strain is length/length ie dimensionless.

    Stress is force/area. ie force/m2. Multiply this by volume (m3) and you get force time distance ie work (energy).

    It does work out :biggrin:
  4. Jan 6, 2012 #3
    Ohhh, thanks! i get it now!
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