scholarly journals Experimentally validated stochastic geometry description for textile composite reinforcements

2016 ◽  
Vol 122 ◽  
pp. 122-129 ◽  
Author(s):  
Andy Vanaerschot ◽  
Brian N. Cox ◽  
Stepan V. Lomov ◽  
Dirk Vandepitte
Keyword(s):  
Stochastic Geometry ◽  
Textile Composite ◽  
Composite Reinforcements

scholarly journals Draping of Textile Composite Reinforcements: Continuous and Discrete Approaches

2007 ◽  
Vol 16 (4) ◽  
pp. 096369350701600 ◽  
Author(s):  
P. Boisse ◽  
N. Hamila ◽  
F. Helenon ◽  
Y. Aimene ◽  
T. Mabrouki
Keyword(s):  
Finite Elements ◽  
Biaxial Tension ◽  
Textile Composite ◽  
Plane Shear ◽  
Multiscale Materials ◽  
Specific Behaviour ◽  
Unit Cells ◽  
Woven Reinforcement ◽  
Composite Reinforcements

The textile reinforcements used for composites are multiscale materials. A fabric is made of woven yarns themselves composed of thousand of juxtaposed fibres. For the simulation of the draping of these textile reinforcements several families of approaches can be distinguished in function of the level of the modelling. The continuous approaches consider the fabric as a continuum with a specific behaviour. The discrete approaches use models of some components such as the yarns and sometimes the fibres. Different approaches used for the simulation of woven reinforcement forming are investigated in the present paper. Among them, an approach based on semi discrete finite elements made of woven unit cells under biaxial tension and in-plane shear is detailed. The advantage and inconvenient of the different approaches are compared.

scholarly journals Modelling of textile composite reinforcements on the micro-scale

2014 ◽  
Vol 14 (1) ◽  
pp. 28-33 ◽  
Author(s):  
Oliver Döbrich ◽  
Thomas Gereke ◽  
Chokri Cherif
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Computational Cost ◽  
Textile Composite ◽  
Element Analysis ◽  
Simulation Tools ◽  
Micro Scale ◽  
Generating Method ◽  
Geometrical Effects ◽  
Composite Reinforcements

Abstract Numerical simulation tools are increasingly used for developing novel composites and composite reinforcements. The aim of this paper is the application of digital elements for the simulation of the mechanical behaviour of textile reinforcement structures by means of a finite element analysis. The beneficial computational cost of these elements makes them applicable for the use in large models with a solution on near micro-scale. The representation of multifilament yarn models by a large number of element-chains is highly suitable for the analysis of structural and geometrical effects. In this paper, a unit cell generating method for technical reinforcement textiles, using digital elements for the discretization, is introduced.

Simulation of Forming and Wrinkling of Textile Composite Reinforcements

2011 ◽  
Author(s):  
N. Hamila ◽  
P. Wang ◽  
E. Vidal-Sallé ◽  
P. Boisse
Keyword(s):  
Textile Composite ◽  
Composite Reinforcements

scholarly journals Modelling the development of defects during composite reinforcements and prepreg forming

2016 ◽  
Vol 374 (2071) ◽  
pp. 20150269 ◽  
Author(s):  
P. Boisse ◽  
N. Hamila ◽  
A. Madeo
Keyword(s):  
Composite Materials ◽  
Structural Integrity ◽  
Fibrous Composite ◽  
Bending Stiffness ◽  
Textile Composite ◽  
Forming Process ◽  
Transition Zones ◽  
Process Simulations ◽  
Composite Reinforcement ◽  
Composite Reinforcements

Defects in composite materials are created during manufacture to a large extent. To avoid them as much as possible, it is important that process simulations model the onset and the development of these defects. It is then possible to determine the manufacturing conditions that lead to the absence or to the controlled presence of such defects. Three types of defects that may appear during textile composite reinforcement or prepreg forming are analysed and modelled in this paper. Wrinkling is one of the most common flaws that occur during textile composite reinforcement forming processes. The influence of the different rigidities of the textile reinforcement is studied. The concept of ‘locking angle’ is questioned. A second type of unusual behaviour of fibrous composite reinforcements that can be seen as a flaw during their forming process is the onset of peculiar ‘transition zones’ that are directly related to the bending stiffness of the fibres. The ‘transition zones’ are due to the bending stiffness of fibres. The standard continuum mechanics of Cauchy is not sufficient to model these defects. A second gradient approach is presented that allows one to account for such unusual behaviours and to master their onset and development during forming process simulations. Finally, the large slippages that may occur during a preform forming are discussed and simulated with meso finite-element models used for macroscopic forming. This article is part of the themed issue ‘Multiscale modelling of the structural integrity of composite materials’.

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