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Wanhill, R.J.H. (author), Schra, L. (author), 't Hart, W.G.J. (author)This report compares the mechanical properties, fracture toughness and fatigue crack growth properties of the damage tolerant/medium strength aluminium plate alloys 2024-T351, 2324-T39, 8090-T651 and 8090-T8171. The main objective, in view of previous work, was to determine whether damage tolerant 8090-T8171 plate can advantageously replace the...report 1995
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Schra, L. (author), 't Hart, W.G.J. (author)Corrosion tests under MASTMAASIS test conditions and alternate immersion constant load stress corrosion tests in a 3.5 % NaCl solution were carried out on 1.6 mm thick sheet material of the Al-Li alloys 2091-T84 and 8090-T81, and on the reference 2024-T3 alloy. Corrosion tests were also carried out on preproduction 2091 sheet. The results of the...report 1992
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't Hart, W.G.J. (author), Schra, L. (author)In the framework of the CEC Brite Euram programme on "Investigations on aluminium-lithium alloys for damage tolerant application", the NLR work in Task 3 concentrated on Fracture Toughness. In part I of the investigation residual strength tests were performed on 500 mm wide CCT panels of the Al-Li sheet alloys 2091-T84 and 8090-T81 and on 2024...report 1992
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- Wanhill, R.J.H. (author), Schra, L. (author), 't Hart, W.G.J. (author) report 1992
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- Wanhill, R.J.H. (author), Schra, L. (author), 't Hart, W.G.J. (author) report 1991
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Wanhill, R.J.H. (author), 't Hart, W.G.J. (author), Schra, L. (author)Since 1984 the NLR has done many fatigue crack growth tests to compare the modern Al-Li alloys 2090, 2091 and 8090 with the conventional damage tolerant alloys 2024 and 2324. Under constant amplitude loading the Al-Li alloy crack growth behaviour is often equivalent or superior to that of the conventional alloys. However, under gust spectrxim...report 1991
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Wanhill, R.J.H. (author), Schra, L. (author), 't Hart, W.J.G. (author)The fatigue crack growth properties of several aluminium-lithium (Al-Li) sheet alloys were compared with those of the widely used conventional 2024-T3 alloy. The data, which are relevant to the in-service inspectable damage tolerance regime, were obtained using constant amplitude and flight simulation (gust spectrum) loading. The Al-Li alloys...report 1991
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Schra, L. (author), 't Hart, W.G.J. (author), Boogers, J.A.M. (author)Outdoor corrosion and stress corrosion tests were conducted on AJl-Li plate and sheet materials for 3 and almost 5 years respectively.report 1990
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Schra, L. (author), 't Hart, W.G.J. (author), Boogers, J.A.M. (author)Outdoor corrosion and stress corrosion tests were conducted on Al-Li plate and sheet materials for 3 and almost 5 years respectively. The results can be summarized as follows: Corrosion: Peak aged XXXA-T651 (8090-T651) exhibited greater exfoliation corrosion resistance than 2024-T351 and 2324-T39 plate. 2091-T3 and 2024-T3 sheet were found to be...report 1990
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Wanhill, R.J.H. (author), Schra, L. (author), 't Hart, W.G.J. (author)A comparison is made of the crack resistance (R-curve), fracture toughness and instability behaviour of candidate damage tolerant aluminiumlithium alloys, 2091 and 8090, and the widely used conventional 2024-T3 alloy. The 2091 alloy was in three heat treatment conditions, T8X, TX and TY, all artificially aged. The 8090 alloy was in the T81...report 1990
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Schra, L. (author), 't Hart, W.G.J. (author)Long-term outdoor exposure tests were done to investigate the effect of cooling rate on corrosion and stress corrosion properties of extruded rods of the high strength aluminium alloys 2024-T4, 2023-T6, 7075-T6 and 7075-T73. The 2024 alloy exhibited a high susceptibility to SCC irrespective of best treatment and cooling rate, whereas 7075-T6 was...report 1990
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Wanhill, R.J.H. (author), Schra, L. (author), 't Hart, W.G.J. (author)Qualification of Al-Li alloys for damage tolerant aerospace structures requires extensive testing and evaluation. In this paper the emphasis is on fracture and fatigue crack growth properties of two candidate sheet alloys, 2091 and 8090, compared with the conventional and widely used 2024 alloy. The relative merits of these materials are...report 1990
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Wanhill, R.J.H. (author), Schra, L. (author), 't Hart, W.G.J. (author)New impetus to continued use of alximinium alloys in major structural areas of aircraft has been given by the development of aluminium-lithium alloys. However, qualification of these new materials for service requires extensive testing and evaluation, preferably in international cooperative programmes. The evaluation of aluminium-lithium alloys...report 1989
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Schra, L. (author), 't Hart, W.G.J. (author)Long-term outdoor stress corrosion tests were executed on overaged 7000 series aluminium alloy plate and forgings. Plate material of the alloys 7010-T7651, 7010-T7451 and 7075-T7351 exhibited an excellent resistance to SCC. PM alloy X7091-T7E69 forgings combined a higher strength with superior SCC resistance as compared to IM alloy forgings. The...report 1988
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Kolkman, H.J. (author), 't Hart, W.G.J. (author), Schra, L. (author)One of the first commercially available Al-Li plate alloys, DTD XXXA-T651, produced by ALCAN International Ltd., was tested in the framework of a European cooperative programme (GARTEUR). The engineering properties were determined in a previous investigation. The present report describes the results of an additional investigation with respect to...report 1987
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't Hart, W.G.J. (author), Kolkman, H.J. (author), Schra, L. (author), Wanhill, R.J.H. (author)Engineering properties of the recently developed plate alloy 2324-T39 and the conventional alloy 2024-T351 are compared. Some results for the aluminium-lithium alloy DTD XXXA-T651 (Aluminium Association designation 8090) are also included. The strengths of 2324-T39 and DTD XXXA-T651 were comparable and significantly higher than that of 2024-T351...report 1985
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Schra, L. (author), 't Hart, W.G.J. (author)Engineering property comparisons have been made for plate material of the newly developed aluminium alloy 2324-T39 and the widely used alloy 2024-T351. The properties considered were: tensile strength, fracture toughness, notched fatigue strength, and the resistance to fatigue crack propagation under both constant amplitude and flight simulation...report 1984
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't Hart, W.G.J. (author), Schra, L. (author)A comparative experimental investigation was done on the advanced plate alloys 7010-T651 from ALCAN and 7150-T6E189 from ALCOA. The mechanical properties, fracture toughness and corrosion properties were determined. The most notable finding was the excellent fracture toughness of alloy 7150-T6E189 combined with a high tensile strength. The...report 1982
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't Hart, W.G.J. (author), Kolkman, H.J. (author), Schra, L. (author)The Jominy end-quench test was applied to rods of the alximinium alloys T010 and X TO9I to obtain a decreasing cooling rate over the length of the rods. After heat treating to a high strength T6 and an overaged TT condition the corrosion properties and the microstructure were determined related to the cooling rate. No influence of cooling rate...report 1982
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't Hart, W.G.J. (author), Schra, L. (author)The engineering properties of PM alloy X7091-T7E69 forgings were compared with those of forgings of the IM alloys 7075-T73, 7175-T736, 7050-T736 and 7010-T736. The properties considered were: strength, fracture toughness, fatigue crack propagation under constant amplitude and flight simulation loading, stress corrosion crack initiation and...report 1982
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