Question

0.75 0.375" F = 8000 lbs 1.0" 1.0 Problem 6: A 5/8 inch Grade 8 bolt (NC) is used to connect two steel plates, each 1.5 inch thick. The bol is rightened to 75 percent of the proof load. A force pulling the two plates apart fluctuates from zero to 12,000 lbs. Compute the following: (a) The proper torque to apply to the bolt. (o) The mean factor of safery, load factor and joint opening factor (np, n and no) for the maximum applied load of 12,000 lbs. (c) The fatigue life of the joint, assuming the load computed in part (b) fluctuates from zero to maximum (R 0) (use the Smith-Watson-Topper approach). (d) The fatigue life of the joint, assuming someone forgot to tighten the bolt. (The tightened" such that Fi0- use the Smith-Watson-Topper approach). bolt was "finger-

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