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Same E for true stress true strain?

  1. Nov 26, 2014 #1


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    Before yield we know that stress/strain= E. Can we obtain the same E if we substitute true stress and true strain in the equation? Why
  2. jcsd
  3. Nov 27, 2014 #2


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    For materials that approximately obey Hookes law in the elastic region prior to yield (steel being the classic example), the true E modulus is slightly higher, but insignificant. True stress versus engineering stress becomes significant after yield , especially when necking begins. Before yield, the reduced area of the cross section is a rather small percentage of the original.
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