how to quantify the energy to failure?

[idaapm]

Hi,
I'm implementing a 3D progressive damage model for fibre-reinforced composites using Hashin's theory. This theory uses de equivalente displacements to compute the damage variables. My question is: how can I quantify the energy to failure per unit volume? I need that to compute the equivalent displacement at failure.
Is it enough to consider: rho=0.5*stress*strain ?
Thanks.

 

[burningDiesel]

energy is the integral over stress * strain, so if you want the energy per unit volume, divide by the volume i guess
For a linear stress strain curve you can use the 0.5*s*e