The stress tensor is given by:
\[
[\sigma] = \begin{bmatrix}
20 & -15 & 0 \\
-15 & 30 & 0 \\
0 & 0 & -20
\end{bmatrix} \text{ MPa}
\]
To draw the stress state on the infinitesimal cubes, we need to represent the normal and shear stresses on each face of the
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