- document
-
de Jonge, J.B. (author)In dit rapport, dat een vervolg is op het NLL rapport TM S.548, wordt de numerieke oplossing van warmtegeleidingsvraagstukken met behulp van differentiemethoden nader bestudeerd. Twee differentiemethoden worden aan de hand van een eenvoudig rekenvoorbeeld vergeleken. Als voorbeeld voor de berekening van temperatutirsverdelingen in aërodynamisch...report 1961
- document
-
Hartman, A. (author), de Jonge, J.B. (author)A series of Redux-bonded single and double lap-joints with non-porous gluelayers of various glueline thicknesses were tested ultrasonically by means of the Fokker Bond Tester. Tensile shear tests were carried out after completion of the ultrasonic tests. Bond Tester indications were in good agreement with theoretical results , indicating the...report 1962
- document
-
de Jonge, J.B. (author)In this Report the analysis of the response of the "Fokker Bond Tester" on single lap joints, given in NLR Report M.2080, is extended to the case of douhle lap joints. Theoretical results are compared with measurements, indicating a good agreement "between theory and experiment.report 1962
- document
-
de Jonge, J.B. (author), Plantema, F.J. (author)Buckling loads euid interaction curves are derived for plates having all four edges clamped, or two opposite edges clamped and the other two simply supported. The analysis is hased on Bijlaard's method of split rigidities in combination with the energy method. A comparison is made with results derived elsewhere without the use of Bijlaard's...report 1966
- document
-
de Jonge, J.B. (author)A number of currently existing gust load models, based either on a discrete gust concept or a continuous gust concept, have been analyzed and compared. Calculations made for three different aircraft types indicated that load spectra based on either of the two model-types show relatively small differences. It is described how flexibility effects...report 1971
- document
-
de Jonge, J.B. (author)The mission analysis concept for defining design loads is assessed and compared with the current design procedure based on Design Envelope Concepts. Although the Mission Analysis Concept permits design loads of equal probability of exceedance to be obtained for all components, this does not imply that a fixed failure probability for the aircraft...report 1972
- document
-
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
- document
- de Jonge, J.B. (author), Spiekhout, D.J. (author) report 1977
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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