\(E_{\mathcal{l}}\left(\mathbf{u}\mathrm{,}\mathrm{\ }\Gamma\right)=\int_{\Omega}{\psi^{e}\left(\mathbf{\varepsilon}\left(\mathbf{u}\right)\right)d\mathbf{x}+\mathcal{G}_{c}\int_{\Gamma}{ds}}\ \),