Hi,
I am new here and have a very basic question on the Strain Energy Density (SED) function of exponential model.
This is the exponential model SED form : W=a(e(b(I1-3))-1)
Now we have certain postulates such as that
1.W=0 when there is no deformation and
2. stress=0 when strain =0.
When there is no deformation I1=3 and hence W=0, which is correct.
However, when we take the 1st derivative of W with respect to I1 to get our stress and then substitute I1=3 we don't get stress=0.
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