Question

Ajoint is composed of a ¾ in.-16 UNF fastener (Steel Grade 5) with cut threads clamping 2 Aluminum plates. The clamped members are 5 times stiffer than the bolt. If the initial preload is 80% of the bolt's proof load, what is the service load that would cause joint separation? Assume that the extemal load is applied at the exact location of the bolt (bolt load factor n-I The fastener in the joint analyzed in Problem 1 is tightened to an initial preload of Fi 20,000 Ib. Then, a tensile cyclic service load with EM R 0 Ib Bans-10 000 las applied to the system. The joint operates at elevated temperatures (T = 860 Considering a confidence level of 90%, will the bolt survive 1,000,000 cycles (and beyond)? If so, compute the safety factor. Assume that the external load is applied at the exact location of the bolt (bolt load factor n1

Answer 1