Strain rate effects on the mechanical behavior of carbon-thermoplastic matrix woven composites
Résumé
Carbone long fiber thermoplastic laminates are considered for structural parts design of an automotive frame. Knowledge of the crashworthiness and dynamic behavior of this material is essential for the structure design. The proposed contribution concerns the application of an optimized approach dedicated to the experimental characterization of the overall dynamic mechanical behavior of a Twill woven carbon-polyamide laminate. The methodology aims to report the strain rate effect on the material response with an attempt to isolate the inherent inertial disturbances in the specimen attributed to the test system. The procedure, already developed in previous work, is applied to a tensile test performed until the specimen total failure for 3 specific relative orientations of fiber: 0°, 90° and ± 45°. The tests are carried out for a strain rate range from the quasi-static (10$^{-4}$ s$^{-1}$) up to 300 s$^{-1}$. The behavior of the material appears to be strain rate sensitive especially for the ±45° fiber orientation. The strain rate effect is attributed to both the viscous behavior of the PA6-6 matrix and visco-damage effects.
Origine | Fichiers produits par l'(les) auteur(s) |
---|