37 \({\mathbf{r}_{I}^{\mathbf{u}}\mathbf{=F}}_{\text{I\ int}}^{\mathbf{u}}-\mathbf{F}_{\text{I\ ext}}^{\mathbf{u}}=\int_{\Omega}{g\left(\varphi,p\right)\mathbb{B}_{I}^{\mathbf{u}T}\mathbf{\sigma}d\Omega}-\int_{\Omega}{\mathbf{N}_{I}^{\text{uT}}\mathbf{b}}+\int_{\partial\Omega}{\mathbf{N}_{I}^{\text{uT}}\mathbf{h}}\ ,\)