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de Vilder, Laurens (author)Experimental research into the spalling behaviour of mortars and if it is possible to predict the spalling resistance. Research is divided into spalling experiments with varying parameters and experiments to analyse and characterize the pore structure. By combining both results, a first step is taken into a formula that is able to predict the...master thesis 2023
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Jongbloed, B.C.P. (author), Teuwen, Julie J.E. (author), Villegas, I.F. (author)Continuous ultrasonic welding is an attractive welding technique for thermoplastic composite structures. In this process, a metallic sonotrode connected to a piezoelectric transducer and to a press moves along the parts to be welded applying ultrasonic vibrations and a static welding force on the welding overlap. Thus far, the research carried...journal article 2023
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de Vos, Camill (author)While aramid fibre composites are generally said to have excellent impact properties, this has not yet been translated to the aerospace sector, where impact prone secondary structures remain to be made from metals or glass fibre reinforced polymer. Aramid fibre reinforced engineering thermoplastics could combine the stiffness of thermoset resins...master thesis 2022
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van der Heiden, Daan (author)<b>Introduction</b><br/>Each year hospitals in the Netherlands generate approximately 1.3 million kilogram of waste from the polypropylene (PP) wrapping paper (WP) used to wrap surgical instruments. The objective of this thesis is to acquire high quality PP, for the use of injection moulding, from blue wrapping paper waste as well as analysing...master thesis 2022
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Jongbloed, B.C.P. (author)One of the most promising welding techniques for thermoplastic composites is ultrasonic welding. It is mainly known as a spot welding technique. The relatively new technology continuous ultrasonic welding of thermoplastic composites makes it possible to obtain large fully welded seams with higher load carrying capabilities. However, at the start...doctoral thesis 2022
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Jongbloed, B.C.P. (author), Vinod, R. (author), Teuwen, Julie J.E. (author), Benedictus, R. (author), Villegas, I.F. (author)Continuous ultrasonic welding is a promising high-speed and energy-efficient joining technique for thermoplastic composite structures. However, in the current state-of-the-art research on the topic numerous deconsolidation voids could be identified at the welding interface, which results in a strength knock-down. The aim of this study is,...journal article 2022
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Zhang, Zhao (author), Liu, Kai (author), Chong, Dan (author), Niu, D. (author), Lin, P. (author), Liu, X. (author), Niu, Yanhui (author), Jing, R. (author)To purify severe air pollution in traffic-intensive urban areas and tunnels, an innovative type of photocatalytic micro-surfacing mixture (PMM) was designed, which was enhanced by polypropylene (PP) fiber and nano-TiO<sub>2</sub>. In this work, the road performance of sixteen PMMs with the different contents of PP and nano-TiO<sub>2</sub>...journal article 2022
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Karmakar, S. (author), Berkhout, Marco (author), Makinwa, K.A.A. (author), Fan, Q. (author)This article presents a Class-D audio amplifier for capacitive piezoelectric speaker loads. Employing a dual voltage feedback (VFB)/current feedback (CFB) topology, the amplifier is capable of damping LC resonance without using an external damping resistor, therefore reducing system power consumption, cost, and size. Additional power savings are...journal article 2022
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Jongbloed, B.C.P. (author), Teuwen, Julie J.E. (author), Benedictus, R. (author), Villegas, I.F. (author)Continuous ultrasonic welding is a promising technique for joining thermoplastic composites structures together. The aim of this study was to gain further insight into what causes higher through-the-thickness heating in continuous ultrasonic welding of thermoplastic composites as compared to the static process. Thermocouples were used to measure...journal article 2021
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Koutras, N. (author)The use of high performance thermoplastic composites (TPCs) in the aviation industry has increased over the last years. TPCs have significant advantages such as superior damage tolerance, excellent chemical resistance and the ability to be welded. To date, mechanical fastening, primarily, and adhesive bonding are the two traditional joining...doctoral thesis 2020
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Koutras, N. (author), Villegas, I.F. (author), Benedictus, R. (author)The influence of the ultrasonic welding process parameters, namely the force and the vibration amplitude, on the crystallinity degree at the welding interface of CF/PPS (carbon fibre reinforced poly(phenylene) sulphide) joints is investigated. Two different sets of parameters, one representing high force and high vibration amplitude (1000 N,...conference paper 2020
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Meinderts, Jorn (author)Plastic is a material that has greatly improved well being for the masses. However, it also contributes significantly to pollution of the natural environment and depletion of natural resources. So far only a small percentage of plastic is recycled and used for the production of new products. Inferior material quality and the inability to make a...master thesis 2019
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Helmer, Niels (author)The additively manufacturing industry is emerging rather quickly and has find its way within numerous fields of expertise. Slowly the building industry is adopting these fabrication methods as well, but there are still a lot of challenges. Especially the bonds within the layered structure are demand more research. Numerous researches have...master thesis 2019
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Berkel, Alex (author)This master thesis research investigates the possibility to repair carbon fiber thermoplastic aircraft<br/>structures using induction welding. Carbon fiber is conductive and heats up when placed inside an<br/>alternating magnetic field. A generator, coil, and pressure frame are needed to perform induction<br/>welding. The support plates needed...master thesis 2018
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Fernandez Dacosta, C. (author), Van Der Spek, Mijndert (author), Hung, Christine Roxanne (author), Oregionni, Gabriel David (author), Skagestad, Ragnhild (author), Parihar, Prashant (author), Gokak, D. T. (author), Strømman, Anders Hammer (author), Ramirez, Andrea (author)CO<sub>2</sub> utilisation is gaining interest as a potential element towards a sustainable economy. CO<sub>2</sub> can be used as feedstock in the synthesis of fuels, chemicals and polymers. This study presents a prospective assessment of carbon capture from a hydrogen unit at a refinery, where the CO<sub>2</sub> is either stored, or partly...journal article 2017
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Motta Dias, M.H. (author), Jansen, K.M.B. (author), Luinge, J.W. (author), Bersee, H.E.N. (author), Benedictus, R. (author)The influence of fiber-matrix adhesion on the linear viscoelastic creep behavior of ‘as received’ and ‘surface modified’ carbon fibers (AR-CF and SM-CF, respectively) reinforced polyphenylene sulfide (PPS) composite materials was investigated. Short-term tensile creep tests were performed on ±45° specimens under six different isothermal...journal article 2016
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Kumar, V.S. (author), Kumar, D. (author), Goyal, T. (author), Mohite, P.M. (author), Kamle, S. (author)Micro Air Vehicles (MAVs) are small unmanned aircrafts which have a maximum size limit of 150 mm in any direction. They can be used for surveillance, reconnaissance, targeting, etc. To perform such missions, MAVs are required to hover. Hummingbirds, having excellent flight characteristics (such as hovering, ability to fly in any direction,...conference paper 2014
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Motta Dias, M.H. (author), Jansen, K.M.B. (author), Luinge, H. (author), Nayak, K. (author), Bersee, H.E.N. (author)The influence of fiber-matrix adhesion on the linear viscoelastic creep behavior of as received and surface modified carbon fiber (AR-CF and SM-CF, respectively) reinforced polyphenylene sulfide (PPS) composite materials was investigated. Short-term tensile creep tests were performed on ±45° specimens under four different isothermal condition;...conference paper 2014
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Van der Post, F.H.L. (author)This thesis focuses on Public Private Partnerships (PPPs) for infrastructural projects, in which PPPs entail Design Build Finance Maintain (and Operate), or DBFM(O) contracts. The main differences of such contracts with more traditional contracts is the establishment of a project-specific Special Purpose Company (SPC), the need for external...master thesis 2011
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- Hansen, R. (author) master thesis 2011
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