MINIMIZE POTENTIAL ENERGY ?

P = ? W dV - ?? T.u ds

where

W = ? ? ij d?ij= ? ? x d?x + ? ? y d?y

+ ? ? z d?z + ? ? xy d?xy + ? ? xz d?xz

+ ? ? yz d?yz ; Strain energy density

T = traction vector, u = displacement vector

Here there are no body forces or initial strains

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