Rubber Impact on 3D Textile Composites

A low velocity impact study of aircraft tire rubber on 3D textile-reinforced composite plates was performed experimentally and numerically. In contrast to regular unidirectional composite laminates, no delaminations occur in such a 3D textile composite. Yarn decohesions, matrix cracks and yarn ruptures have been identified as the major damage mechanisms under impact load. An increase in the number of 3D warp yarns is proposed to improve the impact damage resistance. The characteristic of a rubber impact is the high amount of elastic energy stored in the impactor during impact, which was more than 90% of the initial kinetic energy. This large geometrical deformation of the rubber during impact leads to a less localised loading of the target structure and poses great challenges for the numerical modelling. A hyperelastic Mooney-Rivlin constitutive law was used in Abaqus/Explicit based on a step-by-step validation with static rubber compression tests and low velocity impact tests on aluminium plates. Simulation models of the textile weave were developed on the meso- and macro-scale. The final correlation between impact simulation results on 3D textile-reinforced composite plates and impact test data was promising, highlighting the potential of such numerical simulation tools

Rubber Impact on 3D Textile Composites

A low velocity impact study of aircraft tire rubber on 3D textile-reinforced composite plates was performed experimentally and numerically. In contrast to regular unidirectional composite laminates, no delaminations occur in such a 3D textile composite. Yarn decohesions, matrix cracks and yarn ruptures have been identified as the major damage mechanisms under impact load. An increase in the number of 3D warp yarns is proposed to improve the impact damage resistance. The characteristic of a rubber impact is the high amount of elastic energy stored in the impactor during impact, which was more than 90% of the initial kinetic energy. This large geometrical deformation of the rubber during impact leads to a less localised loading of the target structure and poses great challenges for the numerical modelling. A hyperelastic Mooney-Rivlin constitutive law was used in Abaqus/Explicit based on a step-by-step validation with static rubber compression tests and low velocity impact tests on aluminium plates. Simulation models of the textile weave were developed on the meso- and macro-scale. The final correlation between impact simulation results on 3D textile-reinforced composite plates and impact test data was promising, highlighting the potential of such numerical simulation tools

Des affections viscérales dans la goutte et le rhumatisme chronique

SudocFranceF

Ostéosynthèse des fractures de la palette humérale chez le sujet âgé de plus de 65 ans (pronostic fonctionnel à moyen terme)

CAEN-BU Médecine pharmacie (141182102) / SudocSudocFranceF

The production of reduced-alcohol wines using Gluzyme Mono® 10.000 BG-treated grape juice

The original publication is available at http://www.sasev.org/.High alcohol wines have become a major challenge in the international wine trade. Several physical processes are used to produce wines with reduced-alcohol content, all of which involve the selective extraction of ethanol based on volatility or diffusion. In this study, the possibility of Gluzyme Mono® 10.000 BG (Gluzyme) (Novozymes, South Africa) to reduce the glucose content of synthetic grape juice before fermentation was investigated in order to produce wine with reduced-alcohol content. Gluzyme is a glucose oxidase preparation from Aspergillus oryzae, currently used in the baking industry. Glucose oxidase catalyses the oxidation of glucose to gluconic acid and hydrogen peroxide(H2O2) in the presence of molecular oxygen. Gluzyme was initially used in synthetic grape juice, where different enzyme concentrations and factors influencing its efficiency were investigated under winemaking conditions. The results showed up to 0.5% v/v less alcohol at an enzyme concentration of 20 kU compared to the control samples. This reduction in alcohol was increased to 1 and 1.3% v/v alcohol at pH 3.5 and pH 5.5 respectively in aerated (8 mg/L O2) synthetic grape juice using 30 kU enzyme. Secondly, Gluzyme was used to treat Pinotage grape must before fermentation. Gluzyme-treated wines at 30 kU enzyme concentration after fermentation contained 0.68% v/v less alcohol than the control wines. A decrease in acetic acid concentration of the treated compared to control wines was also observed.Publishers' versio

Towards a multiscale analysis of delamination in dynamics

International audienc

Simulation of delamination under impact using a global–local method in explicit dynamics

International audienc

Développement d'un modèle de l'écrasement progressif des composites stratifiés en dynamique = Development of a simulation of the dynamic progressive crushing of laminated composites

National audienceGrâce à un dispositif d'essai original d'écrasement de plaques composites, des modes d'écrasement élémentaires de stratifiés CFRP ont été observés et analysés pour des chargements statiques et dynamiques. Ces analyses ont permis de proposer un modèle éléments finis 2D explicite, avec modélisation de l'endommagement du matériau à l'échelle mésoscopique, pour la simulation du mode d'écrasement par évasement, avec une bonne corrélation entre modèle et expérience

On the modelling of riveted joints by team type spring element in RADIOSS CRASCH code Application to the crash of an aeronautical substructure

Communication to : IRUC/IRUM, Sophia Antipolis (France), June 21-23, 1999Available from INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1999 n.113 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc