7. A shaft subjected to bending moment varying from -200 N m to +500 N m and a varying torque from 50 N m to 175 N m. If material of the shaft is 30C8, stress concentration factor is 1.85, notch sensitivity is 0.95 reliability 99.9% and factor of safety is 1.5, find the diameter of the shaft. The load on a bolt consists of an axial pull of 10 kN together with a transverse shear force of S kN. Find the diameter of bolt required according to Maximum principal stress theory; b. a. Maximum shear stress theory; Maximum principal strain theory: C. d. Maximum strain energy theory; and Max imum distortion energy theory. e. Take permissible tensile stress at elastic limit = 100 MPa and poisson's ratio -0.3

Required information A solid square rod is cantilevered at one end. The rod is 0.6 m long and supports a completely reversing transverse load at the other end of ±1.7 kN. The material is AISI 1080 hot-rolled steel. If the rod must support this load for 5 x 104 cycles with a design factor of 1.5, what dimension should the square cross section have? Neglect any stress concentrations at the support end. What will the strength of the metal be at 5 x 104 cycles? The strength of the metal at 5 x 104 will be MPa.

A rigid coupling with 30 inches of bolt circle diameter transmits a torque of 18,000 lb-in. The coupling material has a yield strength of 90,000 psi.  The coupling is fastened by six bolts.  Assume design factor of  N=3 Calculate the diameter of each bolt.

Answer is closer to 32 kN/m, but how does it get there?