explicit: energy equilibrium

[mambo5]

Hi,

I model a slab, in my model consisted of 2 step:
step 1= apply load
step 2= apply heat (temperature) with constant load.

anyone got any idea why i not getting my external work energy (ALLWK) = internal energy (ALLIE)?
My understanding that ETOTAL=0.0 (ETOTAL=ALLIE-ALLWK), but the results showed ETOTAL>0.0. It seems the internal work is greather than external work energy. Anyone knows what does the extra energy go?

please advice.

 

[xerf]

Actually the 1st law of thermodynamics is stated in terms of rates. d(ETOTAL)=0