he maximum shear stress is equal to one half the difference of the principal stresses.
Moreover, It should be noted that the equation for principal planes, 2θp, yields two angles between 0° and 360°. The maximum out-of-plane shear stress is 10.2 ksi. We can see why the out-of-plane shear stress is maximum by looking at Mohr's circle. The radius of the inner blue circle is the maximum in-plane shear stress.
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