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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)A large number of flight-simulation tests were carried out on sheet specimens of 7075-T6 and 2024-T3 clad material. A gust load spectrum was adopted and a flight-by-flight loading was applied. The investigation is essentially concerned with macro-crack propagation though a few exploratory tests were conducted on the crack nucleation period. The...report 1968
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Schijve, J. (author), Jacobs, F.A. (author), Tromp, P.J. (author)Random flight-simulation tests were carried out in a similar way as in a previous investigation (NLR TH 68117) but now at lower stress levels. Truncation of the high gust loads again had a predominant effect. Increasing the truncation level considerably decreased the crack propagation rate.report 1969
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Hartman, A. (author), Jacobs, F.A. (author), de Rijk, P. (author)Fatigue tests on 2024-T4 alclad double row riveted single lap joints at fluctuating tension with a mean stress in the nett section of 9.0 kg/mm2 and stress amplitudes ranging from 8.6 to 3.0 kg/mm^ did not show any significant difference in endurance of similar specimens with a size ratio li2,66.report 1962
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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) report 1968
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Hartman, A. (author), Jacobs, P.A. (author)A comparison has been made between the fatigue strength at fluctuating tension of 2024-T3 alclad double row riveted single lap joints at room temperature in the as fabricated condition and at 150°C after stress-aging at this temperature for 100 hours. The tests showed an appreciable decrease in endurance of the specimens tested at 150°C,...report 1963
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Delil, A.A.M. (author), Heemskerk, J.F. (author), Mastenbroek, O. (author), Pauw, A. (author), van Put, P.A.G. (author), Voeten, R.G.H.M. (author), Jacobs, R.H.M. (author), Muller, R. (author), Ebeling, W.D. (author), Beckmann, M.M. (author)Capillary pumped two-phase systems are considered to be: -Prime candidates to provide efficient thermal management systems for future advanced spacecraft. -Promising candidates for the thermal control of advanced larger instruments (e.g. laser-based earth observation instruments) or microgravity experiments. In such capillary pumped two-phase...report 1996
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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), Jacobs, F.A. (author)Constant-amplitude tests and programme tests were carried out on 2024-T3 lug specimens with standard holes, slotted holes and expanded holes. The results give information on (1) programme loading versus constant-amplitude loading, (2) cumulative damage and (3) the improvement of the fatigue endurance obtained by the application of slotted and of...report 1964
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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), Jacobs, F.A. (author), Schra, L. (author) report 1976
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Hartman, A. (author), Jacobs, F.A. (author)The propagation has been studied of fatigue cracks in 2024-T3 alclad sheet under fluctuating tension in different atmospheres. Of the principal constituents of air water vapour had a much more severe effect than oxygen; in wet -pure argon the endurance was much shorter than in dry pure oxygen. In air, other circumstances remaining unaltered, the...report 1964
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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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- 't Hart, W.G.J. (author), Jacobs, F.A. (author), Nassette, J.H. (author) report 1975
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Broek, D. (author), Jacobs, F.A. (author)Static tests were carried out on 280 mildly notched specimens of various aluminium alloys. It appears that the nett section fracture stress as a percentage of the ultimate tensile strength is in general higher for materials of lower ductility. This influence of ductility can be reasonably explained on the basis of measured plastic strain...report 1965
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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), Nederveen, A. (author), Jacobs, F.A. (author)The size effect on crack propagation was studied with sheet specimens of 2024-T3 Alclad. Values of the width were 80, 160, 300 and 600 mm, sheet thickness 3 mm, mean stress 8 kg/mm2 and stress amplitudes 2.5, 4 and 6.5 kg/mm2. Results are compared with the theory of the stress intensity factor and the Weibull theory. Practical implications of...report 1965
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Jacobs, F.A. (author)Some recent developments of the masts and standing rigging of racing-yachts and, on the other hand, the failures of a number of masts and rudderstocks led to the application of aeronautical engineering. Load spectra of the standing rigging of a 10.00 m racing yacht are given and the application of them in a lug. Some information is given on...report 1983
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