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de Jonge, J.B. (author)Fokker-VFW is carrying out a completely new fatigue evaluation of the F-2T aircraft, covering lives up to 120000 flights. This evaluation includes; a)A complete inventory of the configuration status of the F-2T fleet, b)An inventory and evaluation of existing test experience, c)Evaluation of service experience, d)Analytical predictions of life...report 1978
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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
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de Jonge, J.B. (author), Nederveen, A. (author), Tromp, P.J. (author)Fatigue tests under flight simulation loading were done on simple notched 2024-T3 Alclad sheet specimens. Reduction of the gust load amplitudes resulted in an increase of crack initiation life but hardly influenced crack propagation. Reduction of the overall stress level increased both initiation and crack propagation life. The observed...report 1978
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de Graaf, E.A.B. (author)Following an introduction about the methods of failure smalysis the present paper illustrates by meaJis of actual case histories the role of service failure analysis in defining new inspection procedures and the adapting of existing ones. It appears that in some cases this leads to a different design or choice of material. The examples are all...report 1977
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de Jonge, J.B. (author)Fail-safety or damage tolerance i s generally considered as a highly desirable and in some countries as anobligatory property of transport aircraft structures. Recently the USAP issued a detailed requirement on damage tolerance. In the present report various aspects of damage tolerance are discussed with specific reference to the USAP...report 1976
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de Graaf, E.A.B. (author)The present report gives a brief description of the principles and probable advantages of the magnetic rubber inspection technique. The results of a first demonstration of the method at the NLR are discussed. It is concluded that the method needs further evaluation.report 1976
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de Graaf, E.A.B. (author)The present report reviews some of the literature on neutron radiography, its principles and its applications especially as conducted by the Energieonderzoek Centrum Nederland ECN on behalf of the National Aerospace Laboratory NLR. It is concluded that neutron radiography already is a valuable inspection tool and in addition to that it offers...report 1976