Print Email Facebook Twitter Heat treatment studies of aluminium alloy forgings of the AZ 74.61 type. Interim report no. 3: Fatigue crack propagation performance under manoeuvre spectrum loading Title Heat treatment studies of aluminium alloy forgings of the AZ 74.61 type. Interim report no. 3: Fatigue crack propagation performance under manoeuvre spectrum loading Author Schra, L. van Leeuwen, H.P. Meulman, A.E. Institution National Aerospace Laboratory NLR Date 1976-08-01 Abstract The fatigue crack propagation performance of the alloy AZ 74.61 under manoeuvre spectrum loading was studied. The crack propagation behaviour was also compared with that of the American forging alloy AA 7050, not only for simulated manoeuvre loading but also for simulated gust loading and programme loading. It was found that, at comparable strength, the alloy AA 7050 was superior to AZ 74.61. Macro-fractographic observations revealed that the crack propagation behaviour differed with respect to heat treatment, type of the load spectrum and specimen type. These observations emphasize the complexity of fatigue damage acc\imulation under variable amplitude loading. Subject forgingheat treatmentaluminium alloysfatigue testsflight simulationstress corrosion crackingload testscrack propagationgust loadscyclic loadsamplitudesair frame materialaircraft manoeuvresfighter aircraftcorrosion testssalt surav testslife time To reference this document use: http://resolver.tudelft.nl/uuid:e324c377-9bfd-4da6-afe0-968083a42611 Publisher Nationaal Lucht- en Ruimtevaartlaboratorium Access restriction Campus only Source NLR-TR 76074 U Part of collection Aerospace Engineering Reports Document type report Rights (c) 1976 National Aerospace Laboratory NLR Files PDF NLR_TR_76074_U.pdf 22.72 MB Close viewer /islandora/object/uuid:e324c377-9bfd-4da6-afe0-968083a42611/datastream/OBJ/view