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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 Jonge, J.B. (author), Spiekhout, D.J. (author) 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 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
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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
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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
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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
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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
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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