$ W =\displaystyle\frac{1}{2} V E ( \epsilon_1 ^2+ \epsilon_2 ^2+ \epsilon_3 ^2) +\displaystyle\frac{1}{2} V G ( \gamma_1 ^2+ \gamma_2 ^2+ \gamma_3 ^2)$

W =( V * E /2)( e_1 ^2+ e_2 ^2+ e_3 ^2)+( V * G/2)( g_1 ^2+ g_2 ^2+ g_3 ^2)

$ W =\displaystyle\frac{1}{2 E } V ( \sigma_1 ^2+ \sigma_2 ^2+ \sigma_3 ^2)+\displaystyle\frac{1}{2 G } V ( \tau_1 ^2+ \tau_2 ^2+ \tau_3 ^2)$

W = V *( s_1 ^2 + s_2 ^2 + s_3 ^2)/(2* E )+ V * ( t_1 ^2+ t_2 ^2+ t_3 ^2)/(2* G )

$ w =\displaystyle\frac{1}{2} E ( \epsilon_1 ^2+ \epsilon_2 ^2+ \epsilon_3 ^2) \displaystyle\frac{1}{2} G ( \gamma_1 ^2+ \gamma_2 ^2+ \gamma_3 ^2)$

w = E *( e_1 ^2+ e_2 ^2+ e_3 ^2)/2 + G *( g_1 ^2+ g_2 ^2+ g_3 ^2)/2

$ w =\displaystyle\frac{1}{2} E ( \sigma_1 ^2+ \sigma_2 ^2+ \sigma_3 ^2)+ \displaystyle\frac{1}{2 G }( \tau_1 ^2+ \tau_2 ^2+ \tau_3 ^2)$

w = E *( s_1 ^2+ s_2 ^2+ s_3 ^2)/2 + G *( t_1 ^2+ t_2 ^2+ t_3 ^2)/2

$ \tau = G \gamma $

tau = G * gamma

$ E =2 G (1+ \nu )$

E =2* G *(1+ nu )

$ W =\displaystyle\frac{1}{2} V G \gamma ^2$

W = V * G * g^2/2

$ W =\displaystyle\frac{1}{2 G } V \tau ^2$

W = V * t ^2/(2* G )