Searched for: subject:"welding"
(1 - 20 of 103)

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Ebrahimi, Amin (author), Kleijn, C.R. (author), Richardson, I.M. (author)
Development, optimisation and qualification of welding and additive manufacturing procedures to date have largely been undertaken on an experimental trial and error basis, which imposes significant costs. Numerical simulations are acknowledged as a promising alternative to experiments, and can improve the understanding of the complex process...
journal article 2021
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Jongbloed, B.C.P. (author), Teuwen, Julie J.E. (author), Benedictus, R. (author), Fernandez Villegas, I. (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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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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Quan, D. (author), Alderliesten, R.C. (author), Dransfeld, C.A. (author), Tsakoniatis, Ioannis (author), Teixeira De Freitas, S. (author), Scarselli, Gennaro (author), Murphy, Neal (author), Ivanković, Alojz (author), Benedictus, R. (author)
A high-power UV-irradiation technique was proposed for the surface treatment of PPS and PEEK composites, aiming to achieve good adhesion with epoxy adhesives. The composite substrates were rapidly UV-irradiated for a duration of between 2–30s, and then bonded using an aerospace film adhesive to produce joints. Tensile lap-shear strength and...
journal article 2020
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Shahani, Amir Reza (author), Shakeri, Iman (author), Rans, C.D. (author)
Redistribution of residual stress during crack growth in butt welded joint of Al5083-H111 was studied. Furthermore, the effect of post weld heat treatment and removing the weld reinforcements on fatigue crack growth rate was investigated. Three dimensional simulations of welding process and fatigue crack growth were conducted. It was shown...
journal article 2020
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Tsiangou, E. (author), Teixeira De Freitas, S. (author), Fernandez Villegas, I. (author), Benedictus, R. (author)
Ultrasonic welding is a highly promising technique for joining thermoplastic to thermoset composites. A neat thermoplastic coupling layer is co-cured on the surface to be welded to make the thermoset composite ‘weldable’. A reliable bond is attained when miscible thermoplastic and thermoset materials are chosen. For welding carbon fibre...
journal article 2020
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Jongbloed, B.C.P. (author), Teuwen, Julie J.E. (author), Palardy, G. (author), Fernandez Villegas, I. (author), Benedictus, R. (author)
Continuous ultrasonic welding is a high-speed joining method for thermoplastic composites. Currently, a thin film energy director is used to focus the heat generation at the interface. However, areas of intact energy director remain in the welded seam, which significantly lowers the weld strength, and result in a non-uniformly welded seam. To...
journal article 2020
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van Lieshout, P.S. (author)
Structural geometry and stochastic loads such as swell and wind seas can typically induce multiaxial stress states in welded details of marine structures. It is known that such complex time varying stress states determine the fatigue resistance of welded steel joints. Therefore, it is of importance to account for them in fatigue lifetime...
doctoral thesis 2020
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Koutras, N. (author), Fernandez Villegas, I. (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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Xiao, Hong (author), Yan, Dongwei (author), Liu, Guangpeng (author), Wang, Haoyu (author)
High-speed railways adopt continuous welded rail to maintain the smoothness and continuity of the rail surface. However, the welded joint became one of the weakest parts. In order to clear the characteristics and mechanical properties of the new reinforced device, a dynamic three-dimensional vehicle-reinforced device-track coupling model is...
journal article 2020
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Liu, X. (author), Wang, Yuanqing (author), Ban, Huiyong (author), Liu, Ming (author), Veljkovic, M. (author), Bijlaard, F.S.K. (author)
Application of longitudinally profiled (LP) steel plate in the flange of flexural members may provide a good solution to optimize their mechanical performance and to improve the efficiency of steel use, whilst existing design codes provide no design guidance or prediction methodology for such advanced beams in terms of flexural behaviour. To...
journal article 2020
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Zhao, T. (author), Tsakoniatis, Ioannis (author), Rans, C.D. (author), Fernandez Villegas, I. (author), Benedictus, R. (author)
Thermoplastic composite spot welded joints are more well-suited for carrying shear load rather than peel load. However, peel load is difficult to be eliminated in single-lap joint configuration. In this paper, a series of mechanical tests were carried out to study the effects of the spot spacing and the number of welded spots on the secondary...
conference paper 2020
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Xiong, Yongming (author), Li, Chuanxi (author), Chen, Zhuoyi (author), He, Jun (author), Xin, H. (author)
Residual stresses change the stress ratio of fluctuating stresses, hence seriously affect the fatigue life of orthotropic steel decks (OSDs) under traffic loading. Residual stress distributions near the U rib-diaphragm joints are very complicated and need to be investigated further. In this paper, a systematic method has been proposed for...
journal article 2020
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Veldman, S.L. (author), Kortbeek, Peter (author), Wölcken, P.C. (author), R., Herrmann (author), Kos, J. (author), Fernandez Villegas, I. (author)
This paper discusses the development and underlying requirements of a multifunctional lower fuselage demonstrator for a new single aisle aircraft undertaken as part of the Clean Sky 2, Large Passenger Aircraft – Platform 2. The demonstrator will validate high potential combinations of airframe structures, systems, cargo and cabin technology...
conference paper 2020
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Eskes, A.M. (author), de Krom, Diana (author), Bristogianni, T. (author), Rammig, L.M. (author), Veer, F.A. (author), Nijsse, R. (author)
Connecting glass with heat bonds is a way to create all-transparent glass structures. Two methods have been researched in theory and practice, glass welding, through local heating, and glass fusion through global heating. Both methods have been applied to produce 10 mm thick T-sections of soda lime glass while preventing thermal shock failure...
conference paper 2020
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Fu, J. (author), van Slingerland, J. (author), Brouwer, J.C. (author), Bliznuk, Vitaliy (author), Richardson, I.M. (author), Hermans, M.J.M. (author)
Pulsed laser beam welding was used successfully to join the oxide dispersion-strengthened (ODS) Eurofer steel. The joining was conducted with a laser power of 2500 W and a pulsed duration of 4 ms. With the filler material being used, a minor material loss and microvoids were observed in the joint. The microstructure of the fusion zone...
journal article 2020
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Josefson, B. Lennart (author), Bisschop, R. (author), Messaadi, M. (author), Hantusch, J. (author)
The aluminothermic welding (ATW) process is the most commonly used welding process for welding rails (track) in the field. The large amount of weld metal added in the ATW process may result in a wide uneven surface zone on the rail head, which may, in rare cases, lead to irregularities in wear and plastic deformation due to high dynamic wheel...
journal article 2020
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Tsiangou, E. (author), Teixeira De Freitas, S. (author), Fernandez Villegas, I. (author), Benedictus, R. (author)
With its short heating times, ultrasonic welding is a highly promising technique for joining thermoplastic (TPC) to thermoset (TSC) composites, to prevent thermal degradation of the thermoset adherend. A neat thermoplastic coupling layer is co-cured on the surface to be welded to make the TSC “weldable”. For welding CF/PEEK to a TSC adherend,...
conference paper 2020
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Eftekharimilani, P. (author)
The potential for weight reduction, ease of manufacturing and improved crashworthiness makes advanced and ultra high strength steels attractive for automotive applications. Resistance spot welding is by far the most widely used joining method in the automotive industry due to the high operating speeds, the reliability of the process and the...
doctoral thesis 2019
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Ochôa, Pedro (author), Fernandez Villegas, I. (author), Groves, R.M. (author), Benedictus, R. (author)
This article presents research about the propagation of ultrasonic guided waves in ultrasonically welded thermoplastic composite joints. The goal of the study was to understand the effect of weld manufacturing defects on guided wave transmission across the joint. Triangular energy-directors integrated into the lower composite adherends...
journal article 2019
Searched for: subject:"welding"
(1 - 20 of 103)

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