The bolt in Fig. 5-8 is 1/2″-13UNC, machined threads made of 1045 cold-drawn steel. Stress concentration factor is 2. Initial torque is 300 in. lb. Assume the coefficient of friction to be 0.15. Load P varies continuously from 1000 to 3000 lb. The part is steel with area equal to 0.5 in.2 Find the factor of safety for the boll. Find the minimum force in the part.
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