Relationship between processing parameters and mechanical properties of thick glass fibre reinforced pmma composites

micro- and macroscopic scales. More precisely, composite plates are infused at different temperatures, and the evolution of the microstructure along the thickness of each sample is studied. Emphasis is placed on the characterization of porosity distribution and morphology by optical microscopy and X-ray microtomography. Additionally, chromatographic chemical analysis is carried out for the assessment of molecular weight distribution and residual monomer content. The local mechanical response is evaluated by carrying out nano-indentation tests inside the matrix pockets, while in situ transverse compression experiments are performed within a SEM. Thermal analysis as well as a simple thermomechanical method are used to quantify the amplitude of the residual stresses. In parallel, the viscoelastic-viscoplastic response of the bare matrix is determined by combining various macroscopic tests in order to allow micromechanical modelling of representative volume elements. Current results suggest that, while the in situ micromechanical properties of the methacrylic matrix barely vary with the infusion temperature, it strongly affects the amount and distribution of porosity in the composite part – which, in turn, governs the macroscopic mechanical properties of the final composite part and their variability.

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Gayot, S., Bailly, C., Pardoen, T., Chevalier, J., & Gérard, P. (2019). Relationship between processing parameters and mechanical properties of thick glass fibre reinforced pmma composites. Conference proceedings - COMPOSITES 2019, p. P.81. https://hdl.handle.net/2078.5/228124