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Wanhill, R.J.H. (author), Schijve, J. (author)The current status of flight simulation fatigue crack growth concepts is reviewed. Crack growth models and methods of crack growth prediction are compared with respect to applicability and limitations. Research areas for improvement of crack growth prediction are specified.report 1988
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Schijve, J. (author), Jacobs, F.A. (author)Fatigue tests were carried out on Redux and FM 123/5 bonded specimens at various stress levels, temperatures (RT to 65 C) and low and high test frequencies. Observations were made on the type of failure (bond line failure or sheet failure) and the significance of the adhesive squeezeout for crack nucleation. An analysis of the data and a...report 1984
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Schijve, J. (author), Jacobs, F.A. (author)Several simple crack stopping methods were evaluated In fatigue crack propagation tests on 2024-T3 Alclad sheet specimens. After precracklng until a crack of 40 mm was obtained crack stoppers were Installed and the fatigue test was continued. Crack stoppers Installed In stop holes were: a blind rivet, a hard driven rivet, a heavily tightened...report 1984
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Schijve, J. (author)Paper presented at the 16th ICAP Conference, Brussels, 14 and 15 May 1979.report 1979
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Schijve, J. (author), Jacons, F.A. (author), Meulman, A.E. (author)Flight simulation tests on 2024-T3 and 7075-T6 lug specimens indicated significant fatigue life improvements obtained by expanding the holes in accordance with the split-sleeve cold work method. Geometrical distortions induced by the expansion were measured. The significance of residual stresses is analysed with reference to depth of penetration...report 1978
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de Rijk, P. (author), Schijve, J. (author)A second series of exploratory acoustic fatigue tests using a shaker. A second series of exploratory acoustic fatigue tests was carried out, again employing simple specimens mounted on a shaker. Strain measurements were compared with calculations. Crack growth initiated by a central notch was observed. A comparison was made between three types...report 1977
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Schijve, J. (author), Jacobs, F.A. (author), Tromp, P.J. (author)Comparative flight-simulation tests on four types of joints of 2024- T3 sheet material were carried out with and without application of the penetrant LPS-3. Types of joints were douhle strap joint with hi-lok bolts, asymmetric strap joint, lap joint with countersunk rivets and lap joint with dimpled holes. Observations on slip during the fatigue...report 1977
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Jacobs, F.A. (author), Schijve, J. (author), Tromp, P.J. (author)Fatigue tests under flight-simulation loading have been performed on unnotched Alclad 2024-T3, anodised 2.0 mm thick sheet specimens, manufactured according to several machine-shop processes applied in the air craft industry. From the results it appears that milling is preferable to stamping. Rounding off the edges is also advantageous. The...report 1977
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Schijve, J. (author), Jacobs, F.A. (author), Tromp, P.J. (author)Flight-simulation tests based on a standardized gust load spectrum were carried out in normal air, very dry air and salt water. Specimen thicknesses were t = 2 mm and t = 10 mm, mean stress in flight was 70 or 55 MN/m². In all cases a significant effect of the environment was found. Fatigue lives for t = 10 ram were much shorter than for t = 2...report 1976
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Schijve, J. (author), Jacobs, F.A. (author), Tromp, P.J. (author)Flight-simulation tests were carried out on sheet specimens notched "by an open hole (Kt = 2.66). The material was 2024-T3 in three conditions; Alclad, bare and chemically milled. The crack initiation period and the crack propagation period were considerably shorter for the Alclad material. The significance of the cladding, both for constant...report 1976
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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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Schijve, J. (author)The present review consists of three contributions, prepared by (l) The National Aerospace Laboratory NLR, (2) The Aerospace Department of the Delft University of Technology and (3) The Fokker Aircraft Industries. A detailed list of subjects is given in the contents of the review.report 1975
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Schijve, J. (author), Jacobs, F.A. (author), Tromp, P.J. (author)Tests were carried out on open-hole specimens, lugs and riveted strap joints of 2024-T3 and 7075-T6 materials. The effects of design stress level, truncating high-amplitude gust loads and omitting low-amplitude gust cycles were stuaied. Observations of the open-hole specimens include data on crack initiation, crack closure and damage increments....report 1974
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Schijve, J. (author), Jacobs, F.A. (author), Tromp, P.J. (author)Specimens of 2024-T3 and 7075-T6 were tested at 10, 1 and 0.1 cps. Values of mean stress in flight were 10.0, 8.5, 7.0, 5.5 and 4.0 kg/mm(2). The analysis of the results bears upon the frequency effect and its significance for inspection periods in service, the effect of stress level, a comparison between the two alloys, the prediction of crack...report 1973
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Schijve, J. (author)Results are presented from crack propagation tests on aliuninium alloy sheet specimens tested by flight-simulation loading. Five design stress levels were adopted. The usefulness of the stress intensity factor for correlating the data was evaluated. The discussion includes various approaches for predicting crack rates unaer service loading,...report 1973
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- Schijve, J. (author) report 1973
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Schijve, J. (author)The report presents a survey of the various aspects of acoustic fatigue in aircraft structures. The subjects of the chapters are: (l) the noise environment, (2) the mechanical response of the structure, (3) fatigue properties of structures, (U) acoustic fatigue testing, (5) some casehistories. Finally it is tried to evaluate the present state of...report 1973
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de Jong, J.B. (author), Schütz, D. (author), Lowak, H. (author), Schijve, J. (author)A description is given of the development of a standardized load sec[uence which may be considered to be representative for the load history of the wing root of transport aircraift. It is proposed to adopt this standardized sequence for various aeronautical fatigue testing purposes. The standardization proposal was jointly developed by...report 1973
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- Schijve, J. (author) report 1972
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Schijve, J. (author)In a recent test program, fatigue crack propagation in 2024-T3 and 7075-T6 sheet material was studied at three test frequencies, viz.10, 1 and 0.1 cycles per second. The flight-simulation loading was based on a gust spectrum. The design stress level was adopted as a second variable of the investigation. Differences between the crack propagation...report 1972