Determination of a degradation-induced limit for the consolidation of CF/PEEK composites using a thermo-kinetic viscosity model
Résumé
In order to assess the impact of the thermal degradation of PEEK on the consolidation of
composite preforms, an impregnation model taking into account degradation is proposed.
It includes a viscosity model based on a double Arrhenius law describing the viscosity
increase due to degradation. The implementation of this viscosity model into an impreg-
nation model allowed to define an intrinsic processing window for the manufacturing of
CF/PEEK composites based on a criterion of irrecoverable viscosity level. The simulation
shows a good correlation with the experimentally measured porosity rates of commingled
preforms. It predicts the absence of impregnation when increasing the consolidation time
or the processing temperature from 380 to 410°C. Above 410°C or when increasing the
pressure, however, a discrepancy is observed between the model and the simulation. This
discrepancy is attributed to a change in the degradation kinetics resulting from a change
in oxygen access.
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