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Schijve, J. (author), Broek, D. (author), Jacobs, F.A. (author)
Fatigue tests have been carried out on light alloy lugs of 2024 and 7075 material in order to investigate the effects of some geometrical parameters (lug size, geometry of lug) and various means to reduce fretting, viz. lubrication of the pin, flattened pins, slotted holes and expanded holes. Complete S-N curves have been determined at a...
report 1962
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
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Schijve, J. (author)
report 1962
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Broek, D. (author), Schijve, J. (author)
report 1963
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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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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
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Nederveen, A. (author), de Rijk, P. (author), Broek, D. (author), Schijve, J. (author)
report 1964
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Schijve, J. (author)
report 1964
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Broerk, D. (author), Schijve, J. (author)
De invloed van de plaatdikte op de groei van vennoeiingsscheuren werd onderzocht aan 2024-T3 alclad plaat in 5 proevenseries omvattende 5 plaatdikten, t.w. 0.6, 1, 2, 3 en 4 mm. Het bleek dat de scheuren sneller groeien in dikkere plaat. Dit plaatdikte-effect wordt verklaard uit het verschil in spanningstoestand aan de tip van de scheur; aan de...
report 1964
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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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Schijve, J. (author), de Rijk, P. (author)
Tests were carried out at 20°C and 2000 cpm, at 150°C and 2000 cpm and at 150°C and 20 cpm. Results indicate a temperature effect as well as a frequency effect. Crack extension due to creep was considered, a few provisional results being presented. Results are analysed and compared with relevant data from the literature.
report 1965
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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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Schijve, J. (author), de Rijk, P. (author)
Sheet specimens of 2024-T3 Alclad and 7075-T6 Clad were tested in a test hall and outside this hall. Each specimen contained five cracks. The crack growth data allow comparisons to be made (I) between indoors and outdoors (2) between random and program loading (3) between these loadings with and without ground-to-air cycles and (4) between the...
report 1965
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Schijve, J. (author), Broek, D. (author), de Rijk, P. (author), Nederveen, A. (author), Sevenhuysen, P.J. (author)
Fatigue tests were carried out on full-scale tension skins of a wing center section of 7075-T6 material. Variable-amplitude tests were carried out with the following load sequences: (a) random load, (b) program load, (c) random load with GTAC (ground-to-air cycles) and (d) program load with GTAC. Constant-amplitude tests were carried out with...
report 1965
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de Rijk, P. (author), Schijve, J. (author)
report 1966
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Schijve, J. (author), de Rijk, P. (author)
Constant-amplitude tests and simplified flight-simulation tests with 10 or 50 gust cycles per flight were performed. The effect of the ground-to-air cycle is compared with the Palmgren-Miner prediction. Optical and electron microscope observations of the fracture are presented.
report 1966
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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
Hartman, A. (author), Schijve, J. (author)
Berekeningen zijn gemaakt over de plaatbuiging die optreedt in op trek belaste lapnaden en enkele stripnaden met resp. 2 en 2 x 2 rijen nagels. De berekeningen zijn uitgevoerd voor plaatdikten van 1 en 2 mm en enkele waarden voor de nagelrij-afstanden. Bij de enkele stripnaad is bovendien gerekend voor een gestaffelde strip en enige diktes van...
report 1968
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Schijve, J. (author), Jacobs, F.A. (author)
report 1968
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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
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