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de Koning, J. (author)
report 2005
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de Koning, J. (author)
report 2003
document
Koolloos, M.F.J. (author), ten Hoeve, H.J. (author), Grooteman, F.P. (author), de Koning, A.U. (author)
Multiple Site Damage (MSD) is a typical problem for ageing civil and transport aircraft, where the large number of fuselage pressure cycles may cause fatigue cracking at multiple rivet locations. The residual strength of a panel with a leading crack and MSD cracks is lower than that of a panel with the same leading crack but without MSD. This...
report 2001
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de Koning, A.U. (author)
In this report a survey is given of recent research at NLR on damage tolerance analyses of aerospace structures and materials. The work was primarily done under contracts with the NRT (= Nationaal Ruimtevaart Technologie programma) and ESA (European Space Agency). The contributions of NRT are indicated.
report 1997
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de Koning, A.U. (author), Henriksen, T.K. (author)
Probably one of the most challenging problems in fracture mechanics is related to its application to fastener and joints. By nature, not only the quality such as material, manufacturing and mounting processes, of the fasteners are playing a role, but also the stiffness, surface conditions and geometry of the parts are to be considered. Moreover,...
report 1996
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de Koning, A.U. (author), Schra, L. (author)
In this report the experimental procedure is described and results are given of tests for verification of advanced crack growth prediction models. Testing involved constant amplitude fatigue loading at R = 0.1 and R = 0.5. In a similar test series loading was interrupted at regular intervals for application of overloads or overload/underload...
report 1994
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de Koning, A.U. (author), Henriksen, T.K. (author), ten Hoeve, H.J. (author)
Fatigue crack growth associated with cyclic (secondary) plastic flow near a crack front is modelled using an incremental formulation. A new description of threshold behaviour under small load cycles is included. Quasi-static crack extension under high load excursions is described using an incremental formulation of the R-(crack growth resistance...
report 1994
document
de Koning, M.P. (author)
report 1994
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de Koning, M.P. (author)
report 1994
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de Koning, M.P. (author)
report 1994
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de Koning, M.P. (author)
report 1994
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de Koning, M.P. (author)
report 1994
document
de Koning, M.P. (author)
report 1994
document
de Koning, M.P. (author)
report 1994
document
de Koning, M.P. (author)
report 1994
document
de Koning, M.P. (author)
report 1994
document
Richmond, M.J. (author), de Koning, A.U. (author)
Utilising the NLR Stripyield cycle-by-cycle fatigue crack growth model a basic description of the time dependent effects associated with periods of constant load level has been added to model Fatigue-Creep interactions. An outline of the basic Creep model is given along with flow diagrams of the sub programs added to the Stripyield model. Other...
report 1993
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de Winkel, G.D. (author), Verheul, A. (author), de Koning, C.H.M. (author), Puthli, R.S. (author), Wardenier, J. (author), Grotmann, D. (author), Sedlacek, G. (author), Dutta, D. (author), Yeomans, N.F. (author)
report 1993
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Laméris, J. (author), de Koning, A.U. (author)
This report contains the development plan of the NLR contributions to the ESTEC study: "Structural Integrity of Launchers - Part C". It describes the determination of the load transfer in and the stress intensity distribution of loaded metric bolts containing different types of fatigue cracks,
report 1993
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de Koning, C.H.M. (author), Liu, D.K. (author), Puthli, R.S. (author), Wardenier, J. (author)
report 1992
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