Fatigue tests on aluminium alloy forgings
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Abstract
Static strength and fatigue tests have been made on forgings from an aircraft nosewheel assembly to compare the performance of the forgings when made in zinc bearing (D.T.D.683A) and copper bearing (B.S. L.65) aluminium alloys. Tests were made using tbe standard D.T.D.683A material and a variant with chromium added. The effect of using two different quenching temperatures for the forgings in L.65 was also investigated. The results of the tests showed that the forging in D.T.D.683A, with chromium added, had the greatest static strength. There was little to choose between the fatigue performance of the forgings in the different material variants under the same fatigue loads but, under fatigue loads having given percentages of the respeetive static failing loads, the L.65 variants had superior performance in the endurance range 10³ to 10(6) cycles.