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Equazioni di congruenza:
<math>\begin{cases}
\epsilon_xvarepsilon_x=\frac{\delta v_x}{\delta x} \\
\epsilon_varepsilon_{xy}=\frac{1}{2}\left(\frac{\delta v_x}{\delta y}+\frac{\delta v_y}{\delta x}\right) \\
\epsilon_varepsilon_{xz}=\frac{1}{2}\left(\frac{\delta v_x}{\delta z}+\frac{\delta v_z}{\delta x}\right) \\
\epsilon_yvarepsilon_y=\frac{\delta v_y}{\delta y} \\
\epsilon_varepsilon_{yz}=\frac{1}{2}\left(\frac{\delta v_y}{\delta z}+\frac{\delta v_z}{\delta y}\right) \\
\epsilon_zvarepsilon_z=\frac{\delta v_z}{\delta z}
\end{cases}</math>
Equazioni costitutive:
<math>\begin{cases}
\epsilon_varepsilon_{x}=\frac{1}{E} \left[ \sigma_{x} - \nu (\sigma_{y}+\sigma_{z}) \right] \\
\epsilon_varepsilon_{y}=\frac{1}{E} \left[ \sigma_{y} - \nu (\sigma_{x}+\sigma_{z}) \right] \\
\epsilon_varepsilon_{z}=\frac{1}{E} \left[ \sigma_{z} - \nu (\sigma_{x}+\sigma_{y}) \right] \\
\gamma_{xy}=\frac{1}{G}\tau_{xy} \\
\gamma_{xz}=\frac{1}{G}\tau_{xz} \\
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