Two A992 steel pipes, each having a cross-sectional area of 0.32 in2 , are screwed together using a union at B. Originally the assembly is adjusted so that no load is on the pipe. If the union is then tightened so that its screw, having a lead of 0.15 in., undergoes two full turns, determine the average normal stress developed in the pipe. Assume that the union and couplings at A and C are rigid. Neglect the size of the union. Note: The lead would cause the pipe, when unloaded, to shorten 0.15 in. when the union is rotated one revolution.
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