| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Corre, Steven Le
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Topics
Publications (11/11 displayed)
- 2024Accurate 3D modeling of laser-matter interaction in the AFP process by a conductive-radiative FEM approach
- 2022Thick thermoplastic composite laminate consolidation: Experimental observations and numerical approachescitations
- 2021Experimental correlation of rheological relaxation and interface healing times in welding thermoplastic PEKK compositescitations
- 2020Adhesion of High Temperature Thermoplastic Compositescitations
- 2018A study on amplitude transmission in ultrasonic welding of thermoplastic compositescitations
- 2017On the Alternate Direction Implicit (ADI) Method for Solving Heat Transfer in Composite Stampingcitations
- 2014Ultrasonic welding of thermoplastic composites: a numerical analysis at the mesoscopic scale relating processing parameters, flow of polymer and quality of adhesioncitations
- 2011Ultrasonic Welding of Thermoplastic Composites, Modeling of the Process Using Time Homogenization.citations
- 2009Développement d'un code éléments finis pour simuler le soudage par ultrasons de matériaux composites = Development of a Finite element code for simulating the ultrasonic welding of composite materials
- 2008Ultrasonic Welding of Thermoplastic Composites, Modeling and Simulation of the Process
- 2008Ultrasonic welding of thermoplastic composites, modeling of the processcitations
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document
Adhesion of High Temperature Thermoplastic Composites
Abstract
Thermoplastic composites offer new manufacturing prospects, thanks to the ability to melt the matrix. Welding, tape placement, 3D printing, overmoulding, or even stamping involve adhesion of the thermoplastic polymer at high temperature. One of the leading mechanism that enable to build up strength of adherent over the substrate is called healing. It is classically described as the diffusion of the macromolecular chains across the interface that enable bridging. In continuous processes, such as some which are used in advanced manufacturing of aerospace structures, cycle times are very short. Thus, it is unclear how suitable these materials are for fast continuous processesthe limiting factor being the time required to gain adhesion. In order to model and predict such processes, a controlled welding bench was designed enabling very short welding times (~5 seconds). The mechanical adhesion between coupons was assessed by fracture of the welded interface via double cantilever beam fracture test. The welding kinetics were observed for the initial stages of healing with a behavior that should fit the 1/2 trend. From this, it was possible to compare the accuracy and repeatability of interface healing at short time scales to that of samples which were closer to fully welded. Concurrently, the reptation of the polymer melt was assessed on a commercial rheometer, by computing relaxation time from the viscoelastic response. The correlation confirms that the mechanical quality is associated with the macromolecule diffusion. It was also observed that for high temperature thermoplastics, reticulation occurs, which inhibits molecular diffusion and increases the relaxation time. The major implication is that the preprocessing of the polymer will impact the subsequent adhesion step. For example, plates processed with an autoclave for a couple of hours would require a welding time an order of magnitude longer than the adhesion of a virgin prepreg in the tape placement process.