21 research outputs found
POPCOM platform: Composites Advanced Manufacturing
National audiencePOPCOM Composites Advanced Manufacturing Platform @ IMT LIlle Douai : Original facilities for development and industrialization of structural composites and reinforced polymers, embracing the whole chain of product life cycle ⊠the ââSwiss Army Knifeââ of composites
Fabrication par imprégnation directe et assemblage par soudage de composites thermoplastiques structuraux à renfort textile en fibres végétales
National audience* DĂ©veloppement dâune technique originale d'imprĂ©gnation directe de renforts continus de lin par des thermoplastiques totalement ou partiellement bio-sourcĂ©s, par injection dans un moule fermĂ©* Ătude multi-Ă©chelles des mĂ©canismes d'imprĂ©gnation / gonflement sous contraintes thermo-hydromĂ©caniques des fibres vĂ©gĂ©tales. DĂ©duction des Ă©volutions de propriĂ©tĂ©s physiques et mĂ©caniques* Ătude des mĂ©canismes dâimprĂ©gnation de composites moulĂ©s Ă haute cadence avec des thermoplastiques mono- ou bi-composants de haute fluiditĂ©* Assemblage de piĂšces composites renforcĂ©es de fibres vĂ©gĂ©tales par soudage laser* Qualification de la rĂ©sistance des joints de soudure des composites thermoplastiques bio-sourcĂ©
Injection-moulding of nitrogen-foamed bio-based microcellular poly(butylene succinate): Processing conditions/foam structure/flexural properties relationship
This paper aims to identify the main processing parameters that optimize as well the microcellular structure (cell size, cell density) of nitrogen (N2) foamed injection-moulded poly(butylene succinate) (PBS) as the resultant flexural properties of the part. The part beam geometry was designed so as to reproduce some geometrical shapes (e.g. thickness change, ribs, bosses or holes) occurring on most of industrial parts. A Taguchi L9 design of experiments (DOE) has been first used to quantify the effects of processing conditions on microcellular structure and mechanical performances. Among the processing parameters, the melt temperature, gas content, injection volumetric flow rate and back pressure were chosen for the DOE due to their level of influence on gas dissolution and nucleation phases. An analysis of variance (ANOVA) showed that the microcellular structure depended mainly on nitrogen content and, to a lesser extent, on back pressure representation of gas pressure saturation in the PBS/N2 system during the feeding stage. The resultant specific flexural properties were controlled by the skin/core ratio as well as the finesse of foam structure (cell sizes, cell density) but a 15% loss in specific performances was noted compared with the unfoamed part. The microcellular structure/mechanical performances could be thus established from the microstructure analysis. In a second step, the foamed microcellular structure has been improved by introduction of micro-talc in the PBS acting as cell nucleating agent (heterogeneous nucleation). A significant increase in cell density and cell reduction (40%) were observed. © The Author(s) 2020
Injection-moussage physique de piÚces microcellulaires en polymÚre biosourcé
National audienceFabriquer des piĂšces plastiques allĂ©gĂ©es en grande cadence tout en maintenant un niveau de qualitĂ© Ă©levĂ© et une excellente reproductibilitĂ© de structure alvĂ©olaire permet de limiter les coĂ»ts de production en abaissant les tonnages des presses utilisĂ©es mais aussi de rĂ©duire les quantitĂ©s de matiĂšre tout en amĂ©liorant le bilan carbone par lâorigine bio-sourcĂ©e du polymĂšre la diminution des masses transportĂ©es
Injection-moussage physique de piÚces microcellulaires en polymÚre biosourcé
National audienceFabriquer des piĂšces plastiques allĂ©gĂ©es en grande cadence tout en maintenant un niveau de qualitĂ© Ă©levĂ© et une excellente reproductibilitĂ© de structure alvĂ©olaire permet de limiter les coĂ»ts de production en abaissant les tonnages des presses utilisĂ©es mais aussi de rĂ©duire les quantitĂ©s de matiĂšre tout en amĂ©liorant le bilan carbone par lâorigine bio-sourcĂ©e du polymĂšre la diminution des masses transportĂ©es
Injection moulding of long glass fibre reinforced polyamide 6-6: guidelines to improve flexural properties
International audienc
A microstructural approach for modelling flexural properties of long glass fibre reinforced polyamide6.6
International audienc
Flexural creep behaviour of long glass fibre reinforced polyamide 6.6 under thermal-oxidative environment
International audienc
POPCOM platform: Composites Advanced Manufacturing
National audiencePOPCOM Composites Advanced Manufacturing Platform @ IMT LIlle Douai : Original facilities for development and industrialization of structural composites and reinforced polymers, embracing the whole chain of product life cycle ⊠the ââSwiss Army Knifeââ of composites
Analyse du renforcement du polycarbonate par des terpolymÚres blocs nanostructurés
National audienc