INFLUENCE OF CRYSTALLIZATION CONDITIONS ON THE NANO- /MICRO- BEHAVIOR OF CARBON FIBER-REINFORCED PEEK COMPOSITE
(2023) ICCM23 — Location: ICC Belfast (31.July.2023)
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- et. al.
- Abstract
- In the context of the energy transition, the transportation sector faces the double challenge of producing lighter but higher-performance structural parts while improving their recyclability. Thermoset-based composite materials allow the manufacturing of light structures with excellent mechanical properties, but are very hardly recyclable and can only be processed via liquid molding techniques (e.g. vacuum infusion) or prepreg consolidation. Moreover, high-rate composite processing is impossible with such matrices: they require a curing step, which often lasts a few hours at high temperatures. Transitioning from thermoset to thermoplastic polymer matrix composites overcomes these shortcomings. However, this involves understanding how processing conditions influence the microstructure of the thermoplastic matrix and the mechanical performances of the composite. Among thermoplastic polymers, semi-crystalline polymers like polyetheretherketone (PEEK) offer superior mechanical properties. The performances of PEEK-based composites are related to the amount and characteristics of the crystalline phase, which depend on the processing conditions. In this work, chemico-physical characterization techniques are combined with nano-/micro- mechanical tests to link the polymer microstructure to the mechanical response at the fiber/matrix level. The crystalline phase morphology is assessed through atomic force microscopy (AFM), scanning electron microscopy (SEM) as well as polarized optical microscopy (POM). The mechanical properties of the inter-/intra spherulitic and trans-crystallization zones are evaluated via nanoindentation (NI) tests. The knowledge of the crystal formation is used to guide the NI mapping, allowing identification of spherulite rich/poor regions around the fibers. The deformation and damage mechanisms occurring in the matrix at the micro-scale during transverse compression tests are studied using nano-digital image correlation (DIC).
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Citations
Vanpée, S., & et al. (2023). INFLUENCE OF CRYSTALLIZATION CONDITIONS ON THE NANO- /MICRO- BEHAVIOR OF CARBON FIBER-REINFORCED PEEK COMPOSITE. ICCM23, ICC Belfast. https://hdl.handle.net/2078.5/102904