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For a transversely isotropic material, the “plane strain bulk modulus”, K23, is an

engineering constant that is defined by the stress condition (sigma)2 =(sigma)3=(sigma)

and the strain conditions (epsilon)1=0, (epsilon)2=(epsilon)3=(epsilon)

Show that these conditions lead to the stress-strain relationship (sigma)=2*(epsilon)*K23, and find the relationship among K23, E1, E2, G23, Mu12 (poisson's ratio).

I tried using the relationship Epsilon= stiffness matrix x stress, plugging in all the given relationships (and sigma1 is zero because epsilon1 is zero) but just got stuck at

sigma=(epsilon)*E2/(1-Mu23)