Normal and Shear Stresses at Various Angles in a Tensile Specimen

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The shear and normal stresses of a tensile specimen depend on the angle considered, relative to the applied load. In tensile specimens, the normal stress is a maximum when theta = 0 degrees (perpendicular to the axis of the specimen) and the shear stress is a maximum when theta = 45 degrees to the axis of the specimen.

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At theta = 45 deg, the shear stress has to be maximum. But the normal stresses has to be zero. However, in your video, the graph that you made, it asserts that the normal stress is not zero when theta = 45 deg. Why is this?

Arsenic_
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What about if the specimen was hollow? Would the area still be calculated as you did?

Angablue