A tightened bolt experiences several modes of stress. The modes that cause failu

Question

A tightened bolt experiences several modes of stress. The modes that cause failure are often shear stress in the threads (engaged with a nut of thickness t) or axial stress in the shank. It is desired to balance these two stresses such that they would cause failure at the same load, P Determine a relationship between nut thickness t and bolt diameter d that would cause the bolt's shank (in axial normal stress),and threads (in direct shear) to yield at the same time. You will have to make a few assumptions about diameters to use in the equations. State your assumptions.

Explanation / Answer

torque = nut thickness * preload* diameter of bolt

Assumption: joint must be stiffer than bolt

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