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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
document
Schijve, J. (author), de Rijk, P. (author)
Full-scale fatigue tests were previously carried out on wing tension skins under random flight loading, program loading and constant-amplitude loading. Tension skins left from these tests were partly stripped. Tensile test revealed fatigue crack nuclei at various locations. Results have some meaning with respect to the frequency of occurrence of...
report 1967
document
Nederveen, A. (author), de Rijk, P. (author), Broek, D. (author), Schijve, J. (author)
report 1964
document
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
document
Schijve, J. (author)
Constant-amplitude and programme-fatigue tests were carried out on unnotched specimens, central-hole specimens and riveted lap joints. Several comparisons between the results for different manufactures were made and scatter was studied. Data from the literature and correlations with other properties were analysed. Similar comparative test series...
report 1968
document
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
document
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
document
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
document
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
document
Schijve, J. (author), Jacobs, F.A. (author)
report 1968
document
Broek, D. (author), Schijve, J. (author)
report 1963
document
Broek, D. (author), Schijve, J. (author), Nederveen, A. (author)
The effect was studied of artificial aging (up to and beyond maximum hardness, both with and without prior solution heat treatment) on the crack propagation in 2024-T3 alclad sheet. All heat treatments caused a noticeable increase of the rate of crack propagation, which was correlated with a decrease of ductility. The correlation is discussed...
report 1963
document
Schijve, J. (author)
report 1962
document
Schijve, J. (author)
Calculations indicate that the effect of the clamping conditions on the secondary bending will generally be small. On the other hand permanent bending deformation at the overlap will have a significant effect on the secondary bending.
report 1972
document
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
document
Hartman, A. (author), Schijve, J. (author)
Six types of riveted specimens including lap joints and single and deuble strap joints have been compared both, in constant-load-amplitude tests and in programme tests. In the programee tests, based on a gust load spectrum, the endurance of the double strap joint specimens was about three times as long: as that of the single lap joint and the...
report 1969
document
Schijve, J. (author)
report 1964
document
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
document
Schijve, J. (author), Broek, D. (author)
This paper deals with crack propagation under programme-fatigue loading; the programme being derived from a gust spectrum. The validity of the Palmgren-Miner rule for crack propagation has been studied and its usefulness for design purposes is discussed.
report 1962
document
Schijve, J. (author)
Tests were carried out on center section wing panels of 7075 material. The loading was based on strain gage records obtained by flying in turbulent air. Load sequences applied include random loading and programmed loading, with and without ground-to-air cycles. A testing machine was developed for this purpose. Data are presented on critical...
report 1963
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