Global strength in Solid mechanics module

Hi everybody,

I'm using Comsol with the Solid Mechanics module, and I would need to compute the global strength applied to my system. But I can't find how.
In the results nod, global evaluation, I can compute the total elastic strain energy, but the strength I calculate with it (I divide by my prescribed displacement) doesn't match with the expected values.

Any suggestion ?

Regards,

Astrid.