| 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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article
Experimental correlation of rheological relaxation and interface healing times in welding thermoplastic PEKK composites
Abstract
The evolution of polymer welding time to join the interface of thermoplastic Polyetherketoneketone (PEKK) matrix composites was characterized. Using a creep-recovery test protocol to analyse the evolution of rheological behavior, it was shown that for temperatures above the melting point (T > 360 o C), the polymer visco-elastic relaxation time increases exponentially with time-indicating polymer crosslinking or branching. To confirm that relaxation time is proportional to interface healing time, the rheological results were compared to the fracture energy release rate (G 1c) of samples prepared on a custom bench which is capable of isothermally weld composite samples for controlled time intervals. The welding time corresponds directly to the relaxation time. Furthermore, the thermal history that the polymer experienced results in cross linking and influences the welding time. The implication is that temperature exposure from prior processing steps (IR oven pre-heating or autoclave consolidation) can limit the ability to weld components in a predictable way.