Use of numerical simulation of woven reinforcement forming at mesoscale: Influence of transverse compression on the global response
Résumé
Among the possible forming processes for structural composite parts, the Liquid Composite Moulding ones are widely used. For such kind of forming process, a resin injection phase occurs after the forming of a dry fibrous reinforcement skeleton. Several parameters can affect the quality of the manufactured part. It has been experimentally proved that the deformation of the fibrous reinforcement has a significant influence on its permeability. In order to evaluate that parameter, it is necessary to have a realistic deformed solid skeleton. During the pre-forming stage, the fibrous reinforcement can be subjected to different kind of loading: yarn tension and in-plane shear to obtain the correct part shape, but also transverse compression. The aim of this paper is to analyze the influence of that last loading mode on the global state of the solid skeleton. For that purpose, two aspects are explored. First, numerical simulations are performed at the mesoscopic scale: a finite element model of the smallest pattern of the woven textile is realized in which each yarn is modelled used 3D elements. The constitutive behaviour of the yarn must exhibit the specificities of a fibrous material. Secondly, experimental characterization of the yarn material is realized. For that, a new experimental setup is used which allow to investigate the relation between longitudinal tension and transverse compression stiffness of the yarn. This allows determining the material parameters used in the yarn constitutive equation. The other material parameters are determined using a tensile test and an in-plane shear test. X-ray tomography gives geometrical validations of the model. © 2010 Springer-Verlag France.
Mots clés
3d-elements
Constitutive behaviour
Experimental characterization
Experimental setup
Fibrous material
Finite element models
Finite element simulations
Forming process
Global response
Global state
In-plane shear
Liquid composite moulding
Loading modes
Material parameter
Mesoscale
Mesoscopic scale
Numerical simulation
Resin injection
Structural composites
Tensile tests
Transverse compression
Woven textiles
X-ray tomography
Yarn tension
Imaging systems
Polymer blends
Reinforcement
Resins
Superconducting materials
Tensile testing
Textiles
Three dimensional
Tomography
Weaving
Wool
X rays
Yarn
Finite element method