The stress tensor at Point P is given in the following matrix form. For a flat square surface centered at P of area 3.1 mm2 oriented perpendicular to the 13-plane as shown in Figure 4.46, what is the...

The stress tensor

at Point P is given in the following matrix form. For a flat square surface centered at P of area 3.1 mm2 oriented perpendicular to the 13-plane as shown in Figure 4.46, what is the stress on that surface at Point P? Demonstrate that the stress in this problem is not isotropic.