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Etude du comportement et des microstructures de préimprégnés thermoplastiques à renforts tissés au cours du thermoestampage par bias-extension et microtomographie à rayons X
| Content Provider | Semantic Scholar |
|---|---|
| Author | Gassoumi, Mohamed |
| Copyright Year | 2017 |
| Abstract | The thermostamping of woven fabric-reinforced thermoplastic composites usually induces substantial deformations of the composites such as in-plane-shear and out-of-plane consolidation. These deformation modes and the related mesostructure evolutions are still poorly understood. We investigated them using bias extension tests performed with specimens made of glass woven fabrics and polyamide matrix. The macroscale shear behavior of these prepregs was investigated at various temperatures. A multiscale analysis of deformed samples was performed using X -ray microtomography images of the deformed specimens acquired at two different spatial resolutions. First, to analyze the 3D shapes of deformed samples, and in particular, the spatial variations of their thickness so as to quantify the consolidation phenomena induced by the in-plane shear of prepregs. Then, at a lower scale, the analysis showed that these mechanisms were related to the creation of pores. The orientation of the fiber bundles and its through-thickness evolution were also measured along the weft and warp directions in the deformed samples. Results can be used to enhance (i) the existing analytical geometrical models used for bias-extension test, and (ii) the current rheological models for the prediction of thermostamping process. Mots Clés : Bias extension test, Microstructure, tomographie Rayons X, thermoestampage, orientation, porosité |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://hal.archives-ouvertes.fr/hal-01621610/document |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
