Combined Axial Tension and Direct Shear Stresses Repeat Problem. except the screw threads are No. 4-48 UNF American Standard and the shearing force is 50 lb. E A machine screw has Number 8-32 U NC American Standard threads (see Appendix A-3). The screw is subjected to an axial tensile force that produces a direct tensile stress in the threads of 15 000 psi based on the tensile stress area. There is a section under the head without threads that has a diameter equal to the major diameter of the threads. This section is also subjected to a direct shearing force of 120 lb. Compute the maximum shear stress in this section.
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