I wish Kiwi3D can output bending energy per unit area and membrane energy per unit area.

Probably it is possible to compute them from principal membrane stresses and principal bending moments but am not sure

Maybe, if Poisson raito=0, then, they are like this

membrane energy per unit area=1/E(N1*N1+N2*N2) (I think this is correct)

bending energy per unit area=??(M1*M1+M2*M2) (what’s the coefficient for bending energy?)