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Determination of a degradation-induced limit for the consolidation of CF/PEEK composites using a thermo-kinetic viscosity model

Abstract : 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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Submitted on : Thursday, May 5, 2022 - 2:35:42 PM
Last modification on : Friday, August 5, 2022 - 11:43:19 AM
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Olivier de Almeida, Lisa Feuillerat, Jean-Charles Fontanier, Fabrice Schmidt. Determination of a degradation-induced limit for the consolidation of CF/PEEK composites using a thermo-kinetic viscosity model. Composites Part A: Applied Science and Manufacturing, Elsevier, In press, ⟨10.1016/j.compositesa.2022.106943⟩. ⟨hal-03637394⟩

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