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Étude de la résistance à l’impact et de l’endommagement des composites stratifiés à matrice Elium acrylique : caractérisation expérimentale et modélisation numérique multi-échelle

Abstract : In the race for light materials able of meeting modern environmental challenges, an acrylic resin (Elium) has been developed. Elium is a thermoplastic resin able to replace thermosetting matrices, which are widespread nowadays in the industrial world. The present study aims to evaluate the impact resistance and to understand the failure mechanisms of composite laminates based on acrylic matrix under impact loading. We provide a contribution to the multiscale analysis of the impact resistance of laminated composite.First, the impact resistance and the damage tolerance of the acrylic resin based composites were compared with those of conventional composites. Then, the impact performance of the laminated composites has been enhanced by adding copolymer blocks to the liquid acrylic resin. These copolymers are able to form micelles of nanometer sizes, which lead to the improvement of both the acrylic matrix fracture toughness and the impact resistance. The effects of the impact energy, temperature, and composition in nano-copolymers have also been investigated.In order to provide a numerical tool for the prediction of the impact response of the glass fiber/Acrylic laminates, two strategies have been analyzed. The first one, performed at the macroscopic scale, considers the woven ply of the laminate as homogeneous material, and the second one (at the mesoscopic scale), deals with a realistic geometrical description of the yarns undulation. Both models use cohesive zones at the interface between the adjacent plies, to simulate the delamination. For this purpose, experimental and numerical delamination tests were performed to feed the inter-ply damage model. Mechanical tests for material characterization were also performed on specimens in order to identify the ply-damage model parameters. The Mechanics of Structure Genome (MSG) and a finite element based micromechanics approaches were then conducted to evaluate the effective thermomechanical properties of the yarns and the plain woven composite laminate. The realistic topological and morphological textures of the composite were accounted through Texgen software. These numerical impact simulations were performed using the finite element software ABAQUS/Explicit. Both models were implemented through a user material subroutine VUMAT. The obtained results appear in a good agreement with the experimental data and confirm the relevance of the proposed approach.
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Submitted on : Monday, May 13, 2019 - 9:50:56 AM
Last modification on : Friday, February 26, 2021 - 2:48:03 PM
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  • HAL Id : tel-02126958, version 1


Gbèssiho Raphaël Kinvi-Dossou. Étude de la résistance à l’impact et de l’endommagement des composites stratifiés à matrice Elium acrylique : caractérisation expérimentale et modélisation numérique multi-échelle. Mécanique des matériaux [physics.class-ph]. Université de Lorraine, 2018. Français. ⟨NNT : 2018LORR0249⟩. ⟨tel-02126958⟩



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