The Fatigue Strength of Pin-Jointed Connections in Aluminium Alloy B.S. L65

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Abstract
The purpose of this paper is to report investigations into the improvements in fatigue strength of pin-jointed assemblies that could be obtained by the use of interference fits between pin and lug, and the effect on the strength of variations in pin diameter. Direct-stress tension-tension-fatigue determinations were made on assemblies, consisting of an aluminium-alloy lug joined to a steel fork by means of a hardened-steel pin, using one overall size of lug, and varying first the pin size (using a constant percentage interference) and then the degrees of interference (using a constant pin size). Tests were also made on lugs fitted with interference-fit steel bushes and sliding-fit pins. For the overall size of lug tested (2 3/4 in. X 3/4 in., pin centre 1 1/2 in. from the end) the optimum pin size was found to be 1 in. diameter, and the optimum interference on a 1-in. pin was found to be 0.007 in. Joints with such a pin had a fatigue strength at 10 million cycles of about 1/4–9 1/2 tons load as compared with 1/4–1 1/2 tons load using a sliding-fit pin. Bushed lugs gave similar results.

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