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Jongbloed, B.C.P. (author), Teuwen, Julie J.E. (author), Palardy, G. (author), Villegas, I.F. (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
document
Palardy, Genevieve (author), Shi, H. (author), Levy, Arthur (author), Le Corre, Steven (author), Villegas, I.F. (author)
Ultrasonic welding of thermoplastic composite materials is a promising joining technique that is now moving towards up-scaling, i.e. the assembling of large industrial parts. Despite its growing technological maturation, the assumed physical mechanisms underlying ultrasonic heating (viscoelastic heating, friction) are still insufficiently...
journal article 2018
document
Zhao, T. (author), Broek, C.A. (author), Palardy, G. (author), Villegas, I.F. (author), Benedictus, R. (author)
The research in this paper is an essential part of a bigger effort on developing robust sequential ultrasonic welding of multi-spot welded joints in thermoplastic composites. It mainly focused on assessing the impact of the changes in boundary conditions on the welding process and whether it could be circumvented by using an appropriate...
journal article 2018
document
Jongbloed, B.C.P. (author), Teuwen, Julie J.E. (author), Palardy, Genevieve (author), Villegas, I.F. (author)
Continuous ultrasonic welding (CUW) is an innovative high-speed joining method for thermoplastic composites. Currently, thin flat energy directors (EDs) are used to focus the heat generation at the weld line. The resulting fracture surfaces exhibit large areas of intact ED, resulting in a non-uniform weld, and significantly lowering the strength...
conference paper 2018
document
Muller, B. (author), Palardy, G. (author), Teixeira De Freitas, S. (author), Sinke, J. (author)
Autoclave manufacturing of fibre metal laminates, such as GLARE, is an expensive process.Therefore, there is an increasing interest to find cost effective out-of-autoclave manufacturing processes without diminishing the laminate quality. The aim of this study is to evaluate the quality of fibre metal laminate...
journal article 2017
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Villegas, I.F. (author), Palardy, G. (author)
This paper presents a fully experimental study on melting, flow and weld strength development during ultrasonic welding of CF/PPS composites with integrated triangular energy directors. The main goal of this research was assessing whether the heating time to achieve maximum weld strength could be significantly reduced as compared to...
journal article 2017
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Palardy, G. (author), Villegas, I.F. (author)
This paper presents a detailed experimental assessment of the effect of the thickness of flat energy directors (ED) on heat generation at the interface during ultrasonic welding. Power and displacement data showed clear differences caused by the change of thickness, related to heat concentration at the weld line during the process. The extent...
journal article 2017
document
Zhao, T. (author), Palardy, G. (author), Villegas, I.F. (author), Benedictus, R. (author)
Ultrasonic welding is a promising assembly technique for thermoplastic composites and it is well-suited for spot welding. In this study, two typical welding process control strategies, i.e. displacement-controlled and energy-controlled welding, were selected to manufacture spot-welded joints. The influence of different boundary conditions,...
conference paper 2017
document
Villegas, I.F. (author), Palardy, G. (author)
journal article 2016
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Palardy, G. (author), Villegas, I.F. (author)
This paper presents an overview of the latest research on ultrasonic welding of composites performed at the Delft University of Technology. Firstly, we showed that for thermoplastic composites, a simple flat energy director shape, made of a loose film of neat resin, can be used to produce welds of high quality. Furthermore, for single lap...
conference paper 2016
document
Senders, F. (author), van Beurden, M. (author), Palardy, G. (author), Villegas, I.F. (author)
Continuous ultrasonic welding of plastic films, fabrics, and even thermoplastic composite prepreg tape is a common industrial practice. However, continuous ultrasonic welding of stiff thermoplastic composite plates is challenging due to squeeze flow of resin at the welding interface, and significant local deformation of the welding stack, that...
journal article 2016
document
Zhao, T. (author), Palardy, G. (author), Villegas, I.F. (author), Rans, C.D. (author), Martinez, M.J. (author), Benedictus, R. (author)
The in-plane and out-of-plane mechanical behaviour of both ultrasonically spot-welded and mechanically fastened joints was investigated by double-lap shear and pull-through tests, respectively. Spot-welded specimens showed comparable onset failure load and significantly higher joint stiffness compared to mechanical fasteners when carrying shear...
journal article 2016
document
Zhao, T. (author), Palardy, G. (author), Rans, C.D. (author), Benedictus, R. (author)
Ultrasonic welding is a promising assembly technique for thermoplastic composites and it is well-suited for spot welding. In this paper, the in-plane and out-of-plane mechanical behaviour of ultrasonically spot-welded and mechanically fastened joints are investigated by double-lap shear and pull-through tests, respectively. Special attention was...
conference paper 2016
document
Palardy, G. (author), Fernandez Villegas, I. (author)
This paper presents a detailed experimental examination of the influence of the thickness of flat energy directors (ED) on the ultrasonic welding (USW) process for carbon fibre/polyetherimide composites. Three thicknesses of flat ED were compared: 0.06 mm, 0.25 mm and 0.50 mm. Power and displacement data for 0.06 mm-thick EDs did not clearly...
conference paper 2015
document
Palardy, G. (author), Fernandez Villegas, I. (author)
This paper presents a detailed experimental examination of the influence of the thickness of flat energy directors (ED) on the ultrasonic welding (USW) process for carbon fibre/polyetherimide composites. Three thicknesses of flat ED were compared: 0.06 mm, 0.25 mm and 0.50 mm. Power and displacement data for 0.06 mm-thick EDs did not clearly...
conference paper 2015
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