Incontinuum mechanics, and in particular in finite element analysis, the Hu–Washizu principle is a variational principle which says that the action
![{\displaystyle \int _{V^{e}}\left[{\frac {1}{2}}\varepsilon ^{T}C\varepsilon -\sigma ^{T}\varepsilon +\sigma ^{T}(\nabla u)-{\bar {p}}^{T}u\right]dV-\int _{S_{\sigma }^{e}}{\bar {T}}^{T}u\ dS}](https://wikimedia.org/api/rest_v1/media/math/render/svg/17d0c57a17f2bb0c16cd87b955f01e92ac7aa6ca)
is stationary, where 
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