Matrix R

R = \frac{1}{1 + ν} [\begin{matrix} \frac{(1 - ν) ε_{x} + ν (ε_{y} + ε_{z})}{1 - 2 ν} & \frac{γ_{x y}}{2} & \frac{γ_{x z}}{2} \\ \frac{γ_{x y}}{2} & \frac{(1 - ν) ε_{y} + ν (ε_{x} + ε_{z})}{1 - 2 ν} & \frac{γ_{y z}}{2} \\ \frac{γ_{x z}}{2} & \frac{γ_{y z}}{2} & \frac{(1 - ν) ε_{z} + ν (ε_{x} + ε_{z})}{1 - 2 ν} \end{matrix})]

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