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van Leeuwen, H.P. (author), de Rijk, P. (author), Boogers, J.A.M. (author), Huisman, H.N. (author), Wanhill, R.J.H. (author)Circumferentially notched round specimens of 4340 type steel have been plated in a galvanic bath known to be embrittling. The specimens were reclaimed by stripping and baking. Half the specimens were replated in a non-embrittling bath. Reclamation did not remove all traces of hydrogen embrittlement, but raised the threshold stress to such a...report 1979
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Wanhill, R.J.H. (author)Flight simulation fatigue tests were carried out to investigate the effect of differing gust load experiences on fatigue crack propagation in 7075-T6 and the effect of gust load alleviation on 2024-T3. Two gust spectra were used: for 7075-T6 the Fokker F-27 spectrum, and for 2024-T3 the reference spectrum TWIST. There was a large systematic...report 1978
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Wanhill, R.J.H. (author)Fracture toughness tests on two high strength titanium alloys, IMI 550 and 551, showed that the higher strength alloy, IMI 551, had a much lower toughness. The alloys were very similar in microstructure and fracture mechanisms. A number of model formulations for predicting fracture toughness were compared with the experimental results. This...report 1978
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Wanhill, R.J.H. (author)Flight simulation fatigue crack propagation tests with gust spectrum loading were carried out on 2024-T3/carbon-epoxy, 7475-T76l/carbon-epoxy and Ti-6Al-4V/carbon-epoxy laminates with nominal weight savings of -30% as compared to equivalent 2024-T3 panels. The performance of the 2024-T3/carbon-epoxy laminates was much superior to those of the...report 1978
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Wanhill, R.J.H. (author)2024-T3, 2048-T851, 7075-T6 and 7475-T761 aluminium alloy sheets were compared for fatigue crack propagation resistance under manoeuvre spectrum and constant amplitude loading. For manoeuvre spectrum loading 7475-T761 was superior overall, and this superiority is most probably due to superior toughness of this alloy. In more detail, 2024-T3 was...report 1978
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- Wanhill, R.J.H. (author) report 1978
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- Wanhill, R.J.H. (author), Döker, H. (author) report 1977
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Wanhill, R.J.H. (author)Plight simulation fatigue crack propagation tests with gust spectrum loading were carried out on 2024-T3/carbon-epoxy, 7475-T761/carbon-epoxy and Ti-6Al-4V/carbon-epoxy laminates with nominal weight savings of 30% as compared to equivalent 2024-T3 panels. The performance of the 2024-T3/ carbon-epoxy laminates was much superior to those of the...report 1977
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- Wanhill, R.J.H. (author) report 1977
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Wanhill, R.J.H. (author)This paper concisely reviews and discusses (1) metallurgically cleaner alloys like -2124, 2048 and 7475, (2) potential application of 7000 series alloys in tension panels, (3) development of high strength stress corrosion resistant thick section materials like 7010, 7049 and 705O, (4) powder metallurgy 7000 series alloys with high strength and...report 1977
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Wanhill, R.J.H. (author)Flight simulation fatigue crack propagation tests were carried out on 2024-T3, 7475-T761 and mill annealed Ti-6A1-4V sheet in thicknesses up to 3 nim and representative for traJisport aircraft lower wing skin stiffened panels of end load capacities 1.5 and 3 MN/m. There was a significant effect of sheet thickness on crack propagation. Thinner...report 1977
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Wanhill, R.J.H. (author)Flight simulation fatigu-e crack propagation tests were carried out on 2024-T3, 7475-T761 and mill annealed Ti-6A1-4V sheet in thicknesses up to 3 miri and representative for transport aircraft lower wing skin stiffened panels of end load capacities 1.5 and 3 MN/m. The performance of 2024-T3 was much superior, owing mainly to greater retardation...report 1977
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Wanhill, R.J.H. (author)Environmental effects on the fatigue strength and crack propagation resistance of aluminium and titanium alloys are reviewed. Particular attention is paid to the influence of air and aqueous environments on aerospace structural materials. Recommendations are made for future research activity, notably with regard to material selection and service...report 1977
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- Wanhill, R.J.H. (author), Jacobs, F.A. (author), Schra, L. (author) report 1976
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Wanhill, R.J.H. (author), Schra, L. (author)The effects of flat to slant fracture transitions on flight simulation fatigue crack propagation in specimens of 7O5O aluminium alloy forgings are discussed. For specimens containing flat, shearlipped, or full slant fractures at similar crack lengths the crack resistance (R curve) approach appears to provide an explanation for differences in the...report 1976
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Wanhill, R.J.H. (author), Log, C.J. (author)Large lugs are integral to many aircraft components. They are customarily regarded as safe-life items, with consequently low design stress levels. However, safe-life design is becoming increasingly unacceptahle in view of developments in damage tolerant design. Current specifications for damage tolerance recognise the potential applicability of...report 1976
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Wanhill, R.J.H. (author)A study was made of environmental fatigue crack propagation in 2.5 mm thick Ti-6A1-4V sheet conforming to AMS 4911, and 2.2 mm thick IMI 3l8 conforming to BS TA 10. The environments were dry argon, normal air, distilled water and 3.5 ^ aqueous NaCl. There were three alloy/orientation combinations: Ti-6A1-4V L-T, IMI 3l8 L-T and IMI 318 T-L. Test...report 1975
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Wanhill, R.J.H. (author), van Gestel, G.F.J.A. (author)Fatigue crack propagation in 2024-T3, 7075-T6 and 7475-T76I sheet was investigated for crack growth rates in the in-service crack detection regime. I t appears that for a high performance aircraft the crack propagation llife to failure from the assiamed in-service detection limit may he longer for 7475-T76I sheet than for 2024-T3 or 7075-T6...report 1975
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Wanhill, R.J.H. (author), Schijve, J. (author), Jacobs, F.A. (author), Schra, L. (author)The following text is given in the format required for presentation at the Conference and Exhibition "Fatigue Testing and Design", to be held in the City University, London, 5-9 April 1976. The report gives a comparison between the fatigue performances of several sheet and forging materials under gust spectrum loading representing the lower wing...report 1975
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Wanhill, R.J.H. (author)The requirements and problems of high temperature materials in gas turbines are reviewed, with specific reference to turbine discs, blades, vanes and combustion cans. The mechanical and environmental property requirements of these components are discussed, followed by an overview of the types of materials used. Lastly, there is a summary of the...report 1975