For infinite fatigue life, the alternating shear stress maximum is equal to 0.5 MPa.
The maximum shear stress is the amount of shear force that can be focused in a relatively compact space. Any structural part that experiences shear force from an external force acting in a direction that is opposed to and out of alignment with internal forces
The units would predict that stress is calculated by dividing the force by the area where it was generated, and since this area ("A") can be either axial or sectional, the fundamental stress equation is " = F/A."
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