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de Jonge, J.B. (author)A statistical analysis was made of flight load data pertaining to about 10000 RNLAF F-104G operational flights. The distributions of load experience per flight could be fairly well approximated by Weibull-distribution functions. Specific attention is paid to the differences in load experience per aircraft. The paper concludes with a discussion...report 1989
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de Jonge, J.B. (author)The paper starts with a review of the various types of loading acting on the aircraft structure and our ability to accurately predict their magnitude and frequency of occurrence for a given aircraft usage. Next, attention is paid to the variation in load experience and its causes, with specific reference to the variation in aircraft usage. For...report 1989
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de Jonge, J.B. (author)A brief review is given of work performed in the Netherlands in the field of aeronautical fatigue. Where possible, applicable references have been presented.report 1987
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de Jonge, J.B. (author), Noback, R. (author), van der Wekken, J.J.P. (author)Since more than ten years, service load data, including e.g. acceleration peaks, recorded in B747 aircraft have been stored at NLR in the so-called AIDS-Fatigue Data Base. This paper describes the procedures applied to reduce the acceleration date to "delivered gust velocities". The results are presented and compared with other data sources. The...report 1986
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de Jonge, J.B. (author)This report reviews the applicability of damage tolerance concepts to helicopter structures. After a general discussion of the damage tolerance concept, attention is paid to the specific aspects of the helicopter loading environment. Examples are presented of damage tolerant design, both in metal and in composite structures. However, it is felt...report 1986
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de Jonge, J.B. (author), van Lummel, C.W.J. (author)An analysis has been made of acceleration recordings made during 9500 flights of Lockheed (R)F-104G fighter aircraft. The load experience per flight is a stochastic whose distribution turns out to be fairly well approximated by a Weibull distribution. The observed variation in load experience between aircraft flying the same duty is studied in...report 1985
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de Jonge, J.B. (author)The present course book has been prepared as lecture notes for a summer course given at the Technical University of Bandung (ITB) in the summer of 1984. This course took place within the framework of the TTA-79 Technical Assistance Project as agreed between the Governments of Indonesia and the Netherlands. The subjects of the course are listed...report 1984
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de Jonge, J.B. (author)Modern aircraft structures have a finite fatigue life. During the design an estimation of the aircraft usage and the associated load experience will be made. Safe service lives and inspection schedules are determined by analysis and tests on the basis of this design load spectrum. However, the actual service usage can deviate appreciably from...report 1983
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Binnenkade, P. (author), Edelschaap, T. (author), Hoogeboom, P. (author), de Jonge, H.W.G. (author), Pouwels, H. (author), Veugen, L.M.M. (author), Kroon, R.J.G.A. (author), Moek, G. (author), Schwarz, P.G. (author)The Netherlands remote sensing community has expressed a need for systemcorrected SLAR imagery. This means that corrections for aircraft position and attitude as well as sensor characteristics need to be applied to raw data acquired with the Netherlands digital SLAR. The PARES system was designed to fulfil this requirement. The distortions...report 1982
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de Jonge, J.B. (author)The contents of this report will become part of an AGARDograph with the title: "Helicopter Fatigue Design Guide". After a general definition of counting principles, a detailed description of the so called Range Pair- Range or Rainflow Counting Method is presented. Flow diagrams are included. The method is illustrated by means of a worked-out...report 1982
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de Jonge, J.B. (author)The report starts with a general review of the loading of transport aircraft fuselages and the consequent fuselage skin stresses Taking the F-28 fuselage as an example, the potential weight savings that can be obtained by using ARALL as skin material are assessed. The report ends with conclusions and recommendationsreport 1982
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ten Have, A.A. (author), Nederveen, A. (author), de Jonge, J.B. (author), van Leeuwen, H.P. (author)This memorandum presents results of crack propagation tests on notched Alclad 2024-T351 sheet specimens. Two thicknesses were investigated (2 mm and 8 mm), as well as various spectrum modifications and the effect of clustering of severe flights within the test load sequence.report 1982
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de Jonge, J.B. (author), Nederveen, A. (author), ten Have, A.A. (author)In international collaboration, two standardized fatigue test load sequences for helicopter components, HELIX and FELIX, have recently been established. The present report describes tests on notched Titanium Alloy specimens to evaluate the properties of the FELIX standard. Tests included Constauit Amplitude, block programme and FELIX-flight...report 1982
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Nederveen, A. (author), de Jonge, J.B. (author), Tromp, P.J. (author)The effects of systematic variations in mean stress level and in spectrum and ground load severity of a flight simulation test programme have been investigated on riveted specimens (fatigue life) and sheet specimens with central saw cut (crack growth). The fatigue life and crack propagation life in Alclad 202U-T3 compared with Alclad TOT5-T6...report 1980
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de Jonge, J.B. (author)Due to the development of servo hydraulic fatigue testing machines, fatigue tests under realistic loading conditions have become possible. In these tests, standardized load sequences can be applied. The paper describes the main properties of such sequences, including TWIST and FALSTAFF. Various examples of application of these sequences are...report 1980
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de Jonge, J.B. (author)The Standard load sequence FALSTAFF has found widespread application. The present report starts with a reminder of the defining properties of FALSTAFF. The report presents the complete Markov-matrix plus tabulations and level crossings pertaining to the FALSTAFF-sequence.report 1979
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Lowak, H. (author), de Jonge, J.B. (author), Franz, J. (author), Schutz, D. (author)The Transport Wing Standard programme (TWIST) published in March 1973 is considered to be representative for the load history of the wing root of transport aircraft. A description of the shortened version of this load programme called MINITWIST is given in the present report. In all cases where testing time is a prohibitive factor to use TWIST,...report 1979
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de Jonge, J.B. (author)The paper starts with a general discussion on various aspects of life re-assessment. Specific attention is paid to the possibility of re-assesgrnent by means of comparative fatigue tests on specimens. As an illustration of this method, the paper gives a description of the life-re-assessment procedures applied by the Royal Netherlands Airforce...report 1979
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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 Jonge, J.B. (author), Nederveen, A. (author), Tromp, P.J. (author)Riveted specimens that are considered representative for F-27 type wing structure were subjected to comparative flight simululation test in which the gust load severity and Ground-Air-Ground cycle were systematically varied. The effect of these variations on crack propagation behaviour was studied by means of crack growth tests on 2 mm sheet...report 1978