Rheokinetics of thermosetting prepregs before gelation: an original device and experimental characterization procedure
Résumé
Knowledge about the mechanical properties' evolution of thermosetting composites throughout the manufacturing process is a very essential step in understanding the development of certain mechanisms, such internal stress generation and parts deformations, which are controlled by the presence of multiple multi-physics phenomena that occur during the cure. This paper presents an original experimental approach, based on the use of the PVT-HADDOC device, dedicated to analyze the mechanical behavior of a unidirectional aeronautical composite during curing, and especially before the gel point. The test was based on a lubricated compression test sequence, under constant hydrostatic pressure, with stress levels adapted to the evolution of the degree of cure. They enabled to characterize the out-of-plane compressive rheology of the composite. Results show a viscoelastic behavior that can be obtained from the liquid state up to a degree of cure of about 60%, with a Burger's type 4-parameters model.
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