- document
-
Schra, L. (author), van der Hoeven, W. (author)In the aerospace industry there are continuing demands for weight reductions. These demands translate into the need to develop new materials with greater strength and stiffness and/or improved damage tolerance properties. The NLR has followed these developments by conducting experimental programmes to evaluate engineering properties like static...report 1997
- document
- van der Hoeven, J.K. (author) report 1997
- document
- van der Hoeven, J.K. (author) report 1997
- document
- van der Hoeven, J.K. (author) report 1997
- document
- van der Hoeven, J.K. (author) report 1997
- document
- van der Hoeven, J.K. (author) report 1997
- document
- van der Hoeven, J.K. (author) report 1997
- document
-
The effect of fatigue crack length on the residual strength of ARALL3 panels with fingertip doublersvan der Hoeven, W. (author)Fatigue and residual strength tests were done on doubler specimens consisting of an ARALL3 (3/2) laminate with a bonded-on fingertip doubler. The primary objective was to determine the effect of fatigue crack length on the residual strenght and delamination onset stress for this type of specimen. The specimens were precracked to variable crack...report 1994
- document
-
van der Hoeven, W. (author)Fatigue crack growth and residual strength tests were done on ARALL2 (2/1) laminates with bonded-on doublers. The main test variables were the shape of the doubler (square and fingertip) and the thickness of the doubler (0.5 and 0.8 mm). All coupons had a starter notch in the outer aluminium face sheet of the ARALL2 laminate at the edge of the...report 1994
- document
-
van der Hoeven, W. (author)The effect of cooling rate on some mechanical properties of APC-2/AS4 composite was investigated over the range between 1 and 70° C/min. Preconsolidated unidirectional laminates were reprocessed in a hot platen press at controlled cooling rates. Double Cantilever Beam specimens and End Notch Flexure specimens were used to determine the mode I...report 1993
- document
-
van der Hoeven, W. (author)Residual strength tests were performed on ARALL panels consisting of ARALL3 (3/2) laminates with bonded-on doublers. In particular, the effect of the doubler geometry (shape and thickness) on the residual strength was investigated. Prior to residual strength testing all panels were fatigue loaded to create a realistic type of damage, i.e. cracks...report 1992
- document
-
van der Hoeven, W. (author)As part of an international cooperation programme, DSC measurements were performed on 17 resin mixtures, of which the basic constituents were TGDDM and DGEBA epoxies and DDS hardener. The DDS/TGDDM and DGEBA/TGDDM ratios were systematically varied. In addition, for some of the mixtures small amounts of catalyst (0.2 and 2 weight percent) were...report 1990
- document
- Cartalas, Ch. (author), van der Hoeven, H.J.C. (author), Klompé, A.W.H. (author) report 1990
- document
- Hengst, S. (author), van der Hoeven, H.B. (author), Tutuarima, W.H. (author) master thesis 1990
- document
- van der Hoeven, A.J. (author), de Lange, A.A.J. (author), Deprettere, E.F. (author), Dewilde, P.M. (author) journal article 1990
- document
- van der Hoeven, H.B. (author), Tutuarima, W.H. (author), Septya, D. (author), Warte, J. (author) master thesis 1990
- document
-
van der Hoeven, W. (author)Determination of the heat of reaction during the cure of the resin in carbon fibre reinforced epoxy prepreg using Differential Scanning Calorimetry resulted in considerable scatter with the measurements were done on prepreg samples. Differences in resin content between the DSC prepreg samples were suspected to be the main cause of the observed...report 1988
- document
- van der Hoeven, W. (author) report 1988
- document
-
van der Hoeven, W. (author)The effects of strain rate and temperature on the fracture behaviour of three structural adhesives (Redux 775, Metlbond 328 and EC 2216) were investigated using Double Cantilever Beam specimens. The test results were presented as critical elastic energy release rate data (G) to investigate whether this parameter could be used to characterize me...report 1983
- document
-
van der Hoeven, W. (author), Schra, L. (author)The influence of sheet thickness (2 mm and 10 mm) and the influence of laminating (5x2 ram) on the fatigue crack growth properties of the aluminium alloy AL 7010-T 73651 were investigated. Both constant amplitude loading and flight simulation loading were applied. All 2 mm and 10 mm thick sheets were machined from a 150 mm thick plate, i.e....report 1981