X-ray computed tomography of polymer composites

Generation of 3D representative volume elements for heterogeneous materials: a review

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Mathematical Foundations Of Elasticity

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Principles Of Heat Transfer In Porous Media

Liquid crystal elastomers (LCEs) are a unique class of materials that combine rubber elasticity with liquid crystalline anisotropy to produce exceptional physical and optical properties such as act...

Liquid crystal elastomers: an introduction and review of emerging technologies

Meso-scale FE analyses of textile composite reinforcement deformation based on X-ray computed tomography

Bending properties play a significant role in the forming of textile composites reinforcements, particularly in determining the shape of wrinkles. The physics related to the bending of fibrous reinforcements is specific. Bending is due to slippage between the fibers and since the fibers are quasi-inextensible, standard plate and shell theories are irrelevant. To measure bending characteristics, three experimental tests (and their variants) have been developed in the last decades, and efforts are currently devoted to extending and improving these tests. From their results, simulations can be performed by introducing a flexural energy related to the bending moment and the curvature. In particular, wrinkles during forming can be simulated. In the case of 3D modeling of thick reinforcements, the use of generalized continuum mechanics model is necessary because of the bending stiffness of each fiber and the slippage between fibers. In order to simulate textile reinforcements with shells, some shell approaches, different of the standard theories, can correctly calculate the rotations of textile reinforcement normals.

Bending and wrinkling of composite fiber preforms and prepregs. A review and new developments in the draping simulations

3D composite reinforcement meso F.E. analyses based on X-ray computed tomography

Simulation of thermoplastic prepreg thermoforming based on a visco-hyperelastic model and a thermal homogenization

The prediction of yarn buckling and distortions require detailed modelling of the fabric and yarns deformations on the meso-level (level of the interlacing structure). In the current research, computationally viable meso-level simulation is achieved by coupling continuous macro draping simulation with a local meso-modeling in the location where the defects are expected to occur. The macro-simulation uses a membrane-shell continuous model of the fabric. A hyperelastic constitutive model for the yarns (Charmetant – Boisse) is used in the meso-modelling. The model parameters are identified and validated in independent tension, shear, compaction and bending tests of the yarn and the fabric. The simulation reproduces local yarn slippage and buckling, e.g., the yarn distortion on the 3D mould corner. The simulations are compared with the local fabric distortions observed during draping experiments for two carbon plain weave fabrics (12K carbon-fibre tows and with spread tows) on a hemispherical and on a box-shaped moulds.

Naim Naouar

Papers

Meso-scale FE analyses of textile composite reinforcement deformation based on X-ray computed tomography

Bending and wrinkling of composite fiber preforms and prepregs. A review and new developments in the draping simulations

3D composite reinforcement meso F.E. analyses based on X-ray computed tomography

Simulation of thermoplastic prepreg thermoforming based on a visco-hyperelastic model and a thermal homogenization

Coupled meso-macro simulation of woven fabric local deformation during draping