Simulation du remplissage des moules par la méthode des éléments Finis / volume contrôle dans les procédés RTM

International audienceIn the course of this study, the simulation of the resin flow in the RTM process is developed by the control volume finite element method (CVFEM) coupled with the equation of the free surface location. This location is made by means of the so called "Volume of Fluid" methods or VOF. Thus, the position of the flow front, the time-lapse and the rate of the non saturated zone are calculated at every step. Our results will be compared with the experimental and analytical models in the literature. On the whole, our study is concerned with the simulation of the thermally insulated filling of moulds in RTM process while adopting the CVFEM and VOF method, taking into account the presence of obstacles, coupled with the thickness variation effect and the reinforcement coats.La présente étude porte sur la simulation du remplissage isotherme des moules en procédé RTM, en adoptant la méthode CV/FEM et VOF, avec prise en compte de la présence d’obstacles couplée à l’effet de la variation de l’épaisseur et des couches du renfort. Les codes développés ont pour objectif d’optimiser le positionnement des points d’injection, des évents et déterminer les pressions d’injection optimales pour minimiser les temps de cycle. Ces codes utilisent un mailleur propre à l’équipe permettant de discrétiser le domaine en éléments triangulaires non structurés avec possibilité de raffinement local et d’inclusion d’inserts

Simulation du remplissage des moules par la méthode des éléments Finis / volume contrôle dans les procédés RTM

In the course of this study, the simulation of the resin flow in the RTM process is developed by the control volume finite element method (CVFEM) coupled with the equation of the free surface location. This location is made by means of the so called "Volume of Fluid" methods or VOF. Thus, the position of the flow front, the time-lapse and the rate of the non saturated zone are calculated at every step. Our results will be compared with the experimental and analytical models in the literature. On the whole, our study is concerned with the simulation of the thermally insulated filling of moulds in RTM process while adopting the CVFEM and VOF method, taking into account the presence of obstacles, coupled with the thickness variation effect and the reinforcement coats.La présente étude porte sur la simulation du remplissage isotherme des moules en procédé RTM, en adoptant la méthode CV/FEM et VOF, avec prise en compte de la présence d’obstacles couplée à l’effet de la variation de l’épaisseur et des couches du renfort. Les codes développés ont pour objectif d’optimiser le positionnement des points d’injection, des évents et déterminer les pressions d’injection optimales pour minimiser les temps de cycle. Ces codes utilisent un mailleur propre à l’équipe permettant de discrétiser le domaine en éléments triangulaires non structurés avec possibilité de raffinement local et d’inclusion d’inserts

A review and application of the failure criteria on a graphite epoxy under three-point bending test

The application of failure criteria are difficult partly because they are too various and must be validated by biaxial tests, which are expensive to be achieved. In this work, an analytical modeling based on a software program has been elaborated for application of the most general failure criteria and prediction of successive failure. Finally, the results obtained by this analytical modeling show a good correlation with those carried out by experimental study

Flow Analysis during On-line and Radial Injection Applications in Permeability Measurements

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A comparative study of failure criteria applied to composite materials

This article presents an analytical and numerical investigation of the failure loads, successive failures and failure modes of laminated beams. Two simulations were developed to model various composites behaviours under transverse static loading. Progressive failure analysis has been carried out in linear and elastic range. For the two simulations, the first order shear deformation theory with shear correction factor and the finite element method have been used respectively. The main objective of this paper is to evaluate the overall damage and successive failure for different laminates obtained by failure criteria and then to conduct a comparative study of the commonly used failure criteria. Various failure criteria have been studied to predict the load, when the weakest lamina fails under flexural bending test. After the failure of the weakest ply, the stiffness is reduced to account for fibre or matrix failures. The failure criteria are tested with various stiffness reduction models. Comparisons are made between the failure loads, successive failures, failure modes, macroscopic curves and the total behaviour curves obtained by the various failure criteria used