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de Graaf, E.A.B. (author), de Rijk, P. (author)
The concepts of reliability, sensitivity and accuracy of non-destructive inspections are defined. Next is an explanation of the limitations of repetitive use of NDT-rellabi1ity specimens followed by a comparison between the inspection results of fluorescent and red penetrants. Subsequently the paper deals with reliability, sensitivity and...
report 1981
document
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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de Graaf, E.A.B. (author), de Rijk, P. (author)
The present report describes how fatigue cracks were produced in 102 specimens. After cracking these specimens were inspected non-destructively by means of eddy currents, ultrasonics. X-rays and penetrants, and the indications were recorded. Successively the specimens were exposed to corrosion whereafter the inspections were repeated. Upon...
report 1978
document
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
document
Wanhill, R.J.H. (author), de Rijk, P. (author)
report 1973
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Wanhill, R.J.H. (author), de Rijk, P. (author)
report 1973
document
Schijve, J. (author), de Rijk, P. (author)
Flight-simulation tests were carried out under different loading conditions. Omitting low-amplitude gust cycles had a small effect on the crack rate. Truncation of infrequently occurring high-amplitude gust cycles to a lower level considerably accelerated crack growth. A 25 percent increase of the design stress level induces about 2.5 times...
report 1971
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
Hartman, A. (author), Jacobs, F.A. (author), Nederveen, A. (author), de Rijk, P. (author)
The investigation on the propagation of fatigue cracks in aluminium alloy sheet under fluctuating tension comprised four parts. (1) Tests to determine the combined effects of the humidity of the air and the lead frequency (clad 2024-T3 and 7075-T6). (2) Tests to determine the effect of water. (3) Tests to determine the effect of wetting with a...
report 1967
document
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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de Rijk, P. (author), Schijve, J. (author)
report 1966
document
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
document
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
document
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
document
Nederveen, A. (author), de Rijk, P. (author), Broek, D. (author), Schijve, J. (author)
report 1964
document
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
document
de Rijk, P. (author), Hartman, A. (author)
Light alloy specimens consisting of a 2 mm 2024-T load sheet reinforced with doubler plates of 1 mm were loaded in fluctuating tension. Redux and Metlbond 4021 were used as adhesives with glueline thicknesses of about O.05 and 0,5 mm. The Metlbond bonded specimens had a higher endurance than the Redux bonded specimens indicating that in...
report 1962
document
Sohijve, J. (author), Broek, B. (author), de Rijk, P. (author)
report 1961
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