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Intraply shearing characterization of thermoplastic composite materials in thermoforming processes

size: 12pt; color: rgb(0, 0, 0);">The Continuous Fibre Reinforcements and Thermoplastic resin (CFRTP) are widely
size: 12pt;">employed in the prepreg processes. Currently, the most used thermoplastic resins in aeronautics are
size: 12pt;">PPS (polyphenylene sulfide) and PEEK (Polyetheretherketone). They present many advantages on
size: 12pt;">their mechanical properties. However, these mechanical properties depend strongly upon the
size: 12pt;">thermoforming conditions, especially the intraply shearing. In order to improve and complete the
size: 12pt;">understanding about the in-plane shear behavior of thermoplastic composite materials in their
size: 12pt;">forming processes, the thermo-mechanical analysis of PPS/carbon and PEEK/carbon commingled
size: 12pt;">fabrics at different forming temperatures are performed by using the bias-extension tests. The
size: 12pt;">experimental data leads to significant difference on the in-plane shear behavior under different
size: 12pt;">temperature, as well as the wrinkles can be noted in certain thermoforming conditions. Therefore, in
size: 12pt;">order to predict the feasible forming conditions and optimize the important forming parameters of the
size: 12pt;">thermoplastic composites, the in-plan shear behaviors in function of temperature will be integrated
size: 12pt;">into our numerical model to carry out the numerical simulations of thermoforming processes.

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