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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
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de Graaf, E.A.B. (author), Rienks, K.J. (author), van Dreumel, W.H.M. (author)The present report describes the X-ray radiography and subsequent destructive investigation according to metallographic techniques of specimens that were taken from experimental mixed—laminate test panels. Clues for the interpretation of radiopraphs of carbon fibre reinforced composites are given.report 1980
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- Wanhill, R.J.H. (author), de Graaf, E.A.B. (author), Delil, A.A.M. (author) 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
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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 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
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de Graaf, E.A.B. (author), Wanhill, R.J.H. (author), de Koning, A.U. (author)The effects of shot and glass bead peening and hole expansion on the direct stress fatigue life of 7079-1'652 aliiminium alloy specimens are considered. Three types of specimens were employed: unnotched, notched by a central hole and notched at comers. Shot peening was only slightly beneficial for high cycle fatigue, and then only for comer...report 1974
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de Graaf, E.A.B. (author), Jacobs, F.A. (author), Nassette, J.H. (author)This investigation is a comparative study of different types of mechanical surface treatments with the objective of achieving residual compressive stresses at the surface of the test specimen. The fatigue behaviour of these treated specimens in constant amplitude tests and programme tests is dealt with. The benefit of the various treatments for...report 1971