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't Hart, W.G.J. (author)A microscopic study has been performed on carbon composite fracture surfaces, using the Scanning Electron Microscope (SEM). It appears that the SEM is a useful tool to examine the fracture surface characteristics of composite materials failing under different loading conditions.report 1976
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't Hart, W. (author)Document(en) uit de collectie Chemische Procestechnologiereport 1959
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't Hart, W.G.J. (author), Nederveen, A. (author), Nassette, J.H. (author), van Wijk, A. (author)The influence of previous corrosion on fatigue crack initiation has been determined. Cylindrical specimens and flat specimens with a central hole of the aluminium alloy T075-T6 were corroded in a 3.5 % NaC1 solution. The cylindrical specimens were tested under constant amplitude loading while for the specimens with a central hole a block...report 1975
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't Hart, R. (author)Bij het ontwerp van de asfaltbekleding die in 1991 in de Deltagoot is beproefd, bestond het huidige rekenmodel GOLFKLAP nog niet. Er werd gewerkt met een dimensioneringswijze gebaseerd op een lijnlast. Bij de analyse van de metingen zijn indertijd wel golven nagerekend, in die zin dat de gemeten drukken zijn geschematiseerd en met die belasting...report 2008
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Davidse, M.P. (author), 't Hart, R. (author), De Looff, A.K. (author), Van de Ven, M.F.C. (author), Wichman, B.G.H.M. (author), Montauban, C.C. (author)Dit rapport bevat geactualiseerde kennis, waarin voorgesteld wordt delen uit het TR Asfalt voor Waterkeren [1] te vervangen en waarin nieuwe kennis m.b.t. toetsen, inspecteren en ontwerpen van asfalt dijkbekleding is opgenomen. De bijlagen bij dit rapport bevatten detailinformatie, die nodig is voor het uitvoeren van de toetsing en het maken van...report 2010
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't Hart, R. (author), Wolters, G. (author)Bij het renoveren van steenzettingen in de tijzone komt het in Zeeland voor dat onder een oude steenzetting een erg zachte ondergrond van klei zit. Voor aannemers is het lastig om hierop een nieuwe steenzetting te plaatsen, en dat komt terug in de prijs. Daarom overweegt Projectbureau Zeeweringen van Rijkswaterstaat Zeeland om op dergelijke...report 2012
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- 't Hart, R. (author) report 1984
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Wanhill, R.J.H. (author), Schra, L. (author), 't Hart, W.G.J. (author)New impetus to continued use of alximinium alloys in major structural areas of aircraft has been given by the development of aluminium-lithium alloys. However, qualification of these new materials for service requires extensive testing and evaluation, preferably in international cooperative programmes. The evaluation of aluminium-lithium alloys...report 1989
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Wanhill, R.J.H. (author), 't Hart, W.G.J. (author), Schra, L. (author)The fatigue crack propagation resistances of 7010-T7651, 7010-T73651 and 7075-T7351 thick plate were compared for flight simulation (gust spectrum) loading conditions. 7075-T7351 was slightly superior, and it was shown that this superiority was not essentially due to the higher fracture toughness of this alloy. The influence of specimen...report 1979
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Schra, L. (author), 't Hart, W.G.J. (author)Long-term outdoor stress corrosion tests were executed on overaged 7000 series aluminium alloy plate and forgings. Plate material of the alloys 7010-T7651, 7010-T7451 and 7075-T7351 exhibited an excellent resistance to SCC. PM alloy X7091-T7E69 forgings combined a higher strength with superior SCC resistance as compared to IM alloy forgings. The...report 1988
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't Hart, W.G.J. (author), Schra, L. (author)In the framework of the CEC Brite Euram programme on "Investigations on aluminium-lithium alloys for damage tolerant application", the NLR work in Task 3 concentrated on Fracture Toughness. In part I of the investigation residual strength tests were performed on 500 mm wide CCT panels of the Al-Li sheet alloys 2091-T84 and 8090-T81 and on 2024...report 1992
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't Hart, W.G.J. (author), Kolkman, H.J. (author), Schra, L. (author), Wanhill, R.J.H. (author)Engineering properties of the recently developed plate alloy 2324-T39 and the conventional alloy 2024-T351 are compared. Some results for the aluminium-lithium alloy DTD XXXA-T651 (Aluminium Association designation 8090) are also included. The strengths of 2324-T39 and DTD XXXA-T651 were comparable and significantly higher than that of 2024-T351...report 1985
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Davidse, M.P. (author), 't Hart, R. (author), De Looff, A.P. (author), Montauban, C.C. (author), Van de Ven, M.F.V. (author), Wichman, B.G.H.M. (author)Sinds het uitkomen van het Technisch Rapport Asfalt voor Waterkeren, is er de nodige kennis en ervaring opgedaan met het beoordelen van de veiligheid van asfaltdijkbekledingen. Op basis daarvan is de gehanteerde toetsmethode op een aantal punten verbeterd. Dit rapport bevat geactualiseerde kennis m.b.t. het toetsen, inspecteren en ontwerpen van...report 2012
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't Hart, R. (author)Uit de praktijk is een enkel geval bekend waarin de toestand van de teenconstructie zodanig is verwaarloosd dat van enige opsluiting eigenlijk geen sprake meer is. Het is dus reëel om te veronderstellen dat in praktijkgevallen de klemming kan worden gelimiteerd door bezwijken van de teenconstructie. Bij afschuiving kan onderscheidt worden...report 2010
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Wanhill, R.J.H. (author), Schra, L. (author), 't Hart, W.J.G. (author)The fatigue crack growth properties of several aluminium-lithium (Al-Li) sheet alloys were compared with those of the widely used conventional 2024-T3 alloy. The data, which are relevant to the in-service inspectable damage tolerance regime, were obtained using constant amplitude and flight simulation (gust spectrum) loading. The Al-Li alloys...report 1991
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't Hart, W.G.J. (author), Frijns, R.H.W.M. (author)Constant amplitude tension-compression fatigue tests were performed on notched (± 45, 02, 90, 02)s coupon specimens of the composite systems T300/F593, T400H/6376, T800H//5245C and IM6/APC-2. Delamination damage growth as a function of the number of fatigue cycles was determined using the ultrasonic C-scan technique. Considering the resistance...report 1989
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Schra, L. (author), 't Hart, W.G.J. (author)Engineering property comparisons have been made for plate material of the newly developed aluminium alloy 2324-T39 and the widely used alloy 2024-T351. The properties considered were: tensile strength, fracture toughness, notched fatigue strength, and the resistance to fatigue crack propagation under both constant amplitude and flight simulation...report 1984
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't Hart, W.G.J. (author)The susceptibility of currently used CFRP to impact damage has stimulated the development of improved composites. This new generation of composites usually shows increased toughness and damage tolerance as well as improved tensile performance. This is generally not matched, however, by a similar improvement in compressive properties which then...report 1991
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't Hart, W.G.J. (author), Nederveen, A. (author), Stoffels, E. (author), Tromp, J. (author)Residual strength tests have been performed on 610 mm wide centre cracked panels. During the tests, stable crack growth was filmed and crack opening displacements were measured. Fracture toughness was determined using the method of Feddersen. Flight simulation fatigue tests were carried out to investigate the crack propagation properties. A...report 1975
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't Hart, W.G.J. (author)Residual strength tests have been carried out on various Kevlar 49-Carbon epoxy laminate configurations consisting of a carbon/epoxy core with face sheets of Kevlar 49 fabric. The influence of fatigue loading of notched specimens on the residual strength was investigated.report 1978