Searched for: author%3A%22Teuwen%2C+Julie+J.E.%22
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Zweifel, Lucian (author), Brauner, Christian (author), Teuwen, Julie J.E. (author), Dransfeld, C.A. (author)
This study presents two novel methods for in situ characterization of the reaction-diffusion process during the co-curing of a polyetherimide thermoplastic interlayer with an epoxy-amine thermoset. The first method was based on hot stage experiments using a computer vision point tracker algorithm to detect and trace diffusion fronts, and the...
journal article 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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Brito, B.C.Q.B. (author), Teuwen, Julie J.E. (author), Dransfeld, C.A. (author), Villegas, I.F. (author)
Ultrasonic welding is a promising joining technique for thermoplastic composite parts. On the way towards upscaling and industrialisation of this technology, it is crucial to understanding how it is affected by manufacturing tolerances. The objective of the research presented in this paper was to investigate the influence that misaligned...
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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Çelik, O. (author), Choudhary, A. (author), Peeters, D.M.J. (author), Teuwen, Julie J.E. (author), Dransfeld, C.A. (author)
In this study, the effect of rapid laser heating, which is typical during laser-assisted fiber placement (LAFP), on the micro- and meso- structure of the thermoplastic tape was investigated. Thermoplastic tapes were heated above the melting temperature with different heated lengths (30 and 80 mm and heating times (0.2 and 0.8 s) in a dedicated...
journal article 2021
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Verma, Amrit Shankar (author), Jiang, Zhiyu (author), Ren, Zhengru (author), Hu, Weifei (author), Teuwen, Julie J.E. (author)
The presence of rain-induced leading edge erosion of wind turbine blades (WTBs) necessitates the development of erosion models. One of the essential parameters for erosion modeling is the relative impact velocity between rain droplets and the rotating blade. Based on this parameter, the erosion damage rate of a WTB is calculated to estimate...
journal article 2021
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Farooq, U. (author), Heuer, Sönke (author), Teuwen, Julie J.E. (author), Dransfeld, C.A. (author)
Epoxies are inherently brittle materials and to overcome this brittleness, a second microphase (i.e., thermoplastic) is typically added. This modification of epoxy resin using thermoplastics results in reaction-induced phase separating morphologies in the micrometer range. In this study, the influence of the curing history, beyond phase...
journal article 2021
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Verma, Amrit Shankar (author), Di Noi, Sandro (author), Ren, Zhengru (author), Jiang, Zhiyu (author), Teuwen, Julie J.E. (author)
Leading edge erosion (LEE) repairs of wind turbine blades (WTBs) involve infield application of leading edge protection (LEP) solutions. The industry is currently aiming to use factory based LEP coatings that can applied to the WTBs before they are shipped out for installation. However, one of the main challenges related to these solutions is...
journal article 2021
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Bartolome Marques, L.A. (author), Teuwen, Julie J.E. (author)
Rain erosion on the leading edge of wind turbine blades is an intricate engineering challenge for the wind industry. Based on an energetic approach, this work proposes a methodology to characterise the erosion capacity of the raindrop impacts onto the leading edge blades. This methodology can be used with meteorological data from public...
journal article 2021
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Rans, C.D. (author), Teuwen, Julie J.E. (author)
conference paper 2021
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Çelik, O. (author), Hosseini, S. M.Amin (author), Baran, Ismet (author), Grouve, Wouter J.B. (author), Akkerman, Remko (author), Peeters, D.M.J. (author), Teuwen, Julie J.E. (author), Dransfeld, C.A. (author)
The effect of thermal contact resistance (TCR) correlated to the degree of intimate contact (DIC) between the incoming tape and the substrate on the temperature history during laser-assisted fiber placement (LAFP) was investigated. A novel experimental methodology was designed to understand the effect with a non-contact method which did not...
journal article 2021
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Çelik, O. (author), Bussink, T. (author), Peeters, D.M.J. (author), Teuwen, Julie J.E. (author), Dransfeld, C.A. (author)
The effects of laser-induced deconsolidation on the compaction process of CF/PEEK tapes were investigated. First, tapes with different degrees of deconsolidation were manufactured using a laser heater. This procedure resulted in samples with different waviness, thickness, void content and surface roughness values. Then, as-received and laser...
journal article 2021
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Verma, Amrit Shankar (author), Jiang, Zhiyu (author), Ren, Zhengru (author), Caboni, Marco (author), Verhoef, Hans (author), van der Mijle-Meijer, Harald (author), Castro, Saullo G.P. (author), Teuwen, Julie J.E. (author)
Rain-induced leading-edge erosion (LEE) of wind turbine blades (WTBs) is associated with high repair and maintenance costs. The effects of LEE can be triggered in less than 1 to 2 years for some wind turbine sites, whereas it may take several years for others. In addition, the growth of erosion may also differ for different blades and...
journal article 2021
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Verma, Amrit Shankar (author), Jiang, Zhiyu (author), Caboni, Marco (author), Verhoef, Hans (author), van der Mijle Meijer, Harald (author), Castro, Saullo G.P. (author), Teuwen, Julie J.E. (author)
Rain-induced leading-edge erosion of wind turbine blades is associated with high repair and maintenance costs. For efficient operation and maintenance, erosion models are required that provide estimates of blade coating lifetime at a real scale. In this study, a statistical rainfall model is established that describes probabilistic...
journal article 2021
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Verma, Amrit Shankar (author), Vedvik, Nils Petter (author), Gao, Zhen (author), Castro, Saullo G.P. (author), Teuwen, Julie J.E. (author)
The leading edges of wind turbine blades are adhesively bonded composite sections that are susceptible to impact loads during offshore installation. The impact loads can cause localized damages at the leading edges that necessitate damage tolerance assessment. However, owing to the complex material combinations together with varying bondline...
journal article 2021
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Hu, Weifei (author), Chen, Weiyi (author), Wang, Xiaobo (author), Jiang, Zhiyu (author), Wang, Yeqing (author), Verma, Amrit Shankar (author), Teuwen, Julie J.E. (author)
The rain-induced fatigue damage in the wind turbine blade coating has attracted increasing attention owing to significant repair and maintenance costs. The present paper develops an improved computational framework for analyzing the wind turbine blade coating fatigue induced by rain erosion. The paper first presents an extended stochastic...
journal article 2021
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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 high-speed and energy-efficient joining method for thermoplastic composite structures. Our aim was to identify and understand differences between the static and continuous ultrasonic welding process for thermoplastic composites. In particular, melting of the interface, consumed power and energy...
journal article 2020
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Struzziero, G. (author), Teuwen, Julie J.E. (author)
The paper tackles the multi-objective optimisation of the cure stage of the Vacuum Assisted Resin Transfer Moulding (VARTM) process to manufacture the root insert of wind turbine blades. The aim of the study is to compare the Pareto front obtained from a pure heat transfer analysis, where temperature overshoot is an objective, with the one...
journal article 2020
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Verma, Amrit Shankar (author), Castro, Saullo G.P. (author), Jiang, Zhiyu (author), Hu, Weifei (author), Teuwen, Julie J.E. (author)
The issue of leading edge erosion (LEE) of wind turbine blades (WTBs) is a complex problem that reduces the aerodynamic efficiency of blades, and affects the overall cost of energy. Several research efforts are being made at the moment to counter erosion of WTBs such as-testing of advanced coating materials together with development of high...
journal article 2020
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Struzziero, G. (author), Nardi, D. (author), Sinke, J. (author), Teuwen, Julie J.E. (author)
The paper addresses the role played by the cure stage of a vacuum assisted resin transfer molding process in residual stresses generation. The Airstone 780E epoxy resin and Hardener 785H system broadly used in the wind turbine blade industry has been used in this study. The viscous–elastic properties of the resin have been characterized and...
journal article 2020
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