Meso-Macro Simulations of Textile Composite Forming

2008 ◽  
Author(s):  
Nahiene Hamila ◽  
Philippe Boisse ◽  
Sylvain Chatel
Keyword(s):  
Woven Fabric ◽  
Textile Composite ◽  
Multiscale Materials ◽  
Discrete Approach ◽  
Resin Injection ◽  
Composite Forming ◽  
Unit Cells ◽  
Forming Simulations ◽  
Validation Tests ◽  
Textile Fabric

Composite textile reinforcement draping simulations aid in determining the processing conditions for a quality part and in finding the positions of the fibers after forming. This last point is essential for the structural computations of the composite part and for resin injection analyses in the case of LCM processes. Because the textile composite reinforcements are multiscale materials, continuous (macro) approaches and discrete (meso) approaches that model the yarns have been developed. The finite element that is proposed in this paper for textile fabric forming is composed of woven unit cells. The mechanical behaviour of these is analyzed by 3D computations at the mesoscale. The warp and weft directions of the woven fabric can be in an arbitrary direction with respect to the direction of the element side. This is very important in the case of multi-ply deep drawing and when using remeshing. The element is efficient because it is close to the physics of the woven cell while avoiding the very large number of unknowns in the discrete approach. A set of validation tests and forming simulations on single-ply and multi-ply fabrics is presented and shows the efficiency of the approach.

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 A Shell Formulation for Textile Composite Forming Simulations

2020 ◽  
Vol 47 ◽  
pp. 55-59
Author(s):  
Renzi Bai ◽  
Philippe Boisse ◽  
Biao Liang ◽  
Naim Naouar ◽  
Julien Colmars
Keyword(s):  
Textile Composite ◽  
Composite Forming ◽  
Forming Simulations ◽  
Shell Formulation

scholarly journals Simulation of mono-ply and multi-ply woven composite reinforcements forming

2008 ◽  
pp. 919-931
Author(s):  
Nahiene Hamila ◽  
Fabrice Hélénon ◽  
Philippe Boisse ◽  
Sylvain Chatel
Keyword(s):  
Numerical Simulation ◽  
Mechanical Behaviour ◽  
Composite Structure ◽  
Woven Composite ◽  
Textile Composite ◽  
Moulding Process ◽  
Forming Simulation ◽  
Composite Forming ◽  
Liquid Moulding ◽  
Composite Reinforcement

The numerical simulation of composite forming permits to envisage the feasibility of a process without defect but also to know the directions of the reinforcements after shaping. These directions condition strongly the mechanical behaviour of the final textile composite structure. In addition, the angles between warp and weft yarns influence the permeability of the reinforcement and thus the filling of the resin in the case of a liquid moulding process. The forming of composite reinforcement can be made on a single ply or simultaneously on several plies. In this paper the different approaches for the textile reinforcement forming simulation are described. A three node element with arbitrary directions of the yarns with regard to the element sides is presented and used for the simultaneous hemispherical forming of three layers.

scholarly journals Analysis of the Blank Holder Force Effect on the Preforming Process Using a Simple Discrete Approach

2013 ◽  
Vol 554-557 ◽  
pp. 441-446 ◽  
Author(s):  
Walid Najjar ◽  
Xavier Legrand ◽  
Philippe Dal Santo ◽  
Damien Soulat ◽  
Serge Boude
Keyword(s):  
Process Parameters ◽  
Material Behavior ◽  
Woven Fabric ◽  
Physical Parameters ◽  
Angle Distribution ◽  
Forming Process ◽  
Plane Shear ◽  
Blank Holder ◽  
Moulding Process ◽  
Discrete Approach

Simulation of the dry reinforcement preforming, first step of the Resin Transfer Moulding process, become necessary to determine the feasibility of the forming process, compute the fiber directions in the final composite component, and optimize process parameters during this step. Contrary to geometrical approaches, based on fishnet algorithms, finite element methods can take into account the actual physical parameters, the real boundary conditions and the mechanical behavior of the textile reinforcement. The fabric can be modeled either as continuum media with specific material behavior [5, 6], or using discrete structural elements to describe the textile structure at the mesoscopic scale. A semi-discrete approach, which is a compromise between the above continuous and discrete approaches, is also used for simulation. A discrete approach for the simulation of the preforming of dry woven reinforcement has been proposed and presented in a previous paper. This modelling is based on a “unit cell” formulated with elastic isotropic shells coupled to axial connectors. The connectors, which replace bars or beams largely studied in other discrete approaches, reinforce the structure in the yarn directions and naturally capture the specific anisotropic behavior of fabric. Shell elements are used to take into account the in-plane shear stiffness and to manage contact phenomena with the punch and die. The linear characteristic of the connectors, has been extended to a non linear behaviour in the present paper to better account for fabric undulation. Using this numerical model, we propose, in this work to study the effect of process parameters on the woven fabric deformation during the performing step. The emphasis will be placed on the analysis of the influence of the blank holder pressure on the shear angle distribution.

Forming Simulation Sensitivity Study of the Double-Dome Benchmark Geometry

2012 ◽  
Vol 504-506 ◽  
pp. 301-306 ◽  
Author(s):  
Bert Rietman ◽  
Sebastiaan P. Haanappel ◽  
René H.W. ten Thije ◽  
Remko Akkerman
Keyword(s):  
Finite Element ◽  
Sensitivity Study ◽  
Woven Fabrics ◽  
Woven Fabric ◽  
Forming Simulation ◽  
Finite Element Software ◽  
Forming Simulations ◽  
Definition Of ◽  
Doubly Curved ◽  
Twill Weave

Simulations of manufacturing processes are of utmost importance in order to check on process feasibility of composites products already during the design phase. In order to benchmark the different software for (thermo)forming simulations of textiles and composites a benchmark geometry was agreed during previous Esaform conferences. Round 2 results have led to the insight that a stronger definition of the benchmark was needed, see [1]. The geometry, referred to as double-dome, combines doubly curved regions with steep walls and small radii. Therefore it may be considered critical with respect to forming behavior. As testing material a Twintex comingled glass/PP both as plain and twill weave woven fabric were chosen [2]. This paper addresses the simulation of the double-dome with the finite-element software Aniform. Shear angles, draw-in and the possible presence of wrinkles will be taken into account and compared to round 2 results of other participants. Additionally, a numerical sensitivity study of material and process parameters will be presented in order to identify major influences on the forming results. The paper concludes with a number of recommendations for further research as well as possible improvements for numerical modeling. [1] Sargent et.al., “Benchmark study of finite element models for simulation the thermostamping of woven-fabric reinforced composites”. Proceedings of the 13th Esaform Conference, Brescia 2010. [2] Cao et.al., “Characterisation of mechanical behaviour of woven fabrics: experimental methods and benchmark results”, Composites Part A: Applied Science and Manufacturing, 2008.

scholarly journals Textile Composite Damage Analysis Taking into Account the Forming Process

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5337
Author(s):  
Marjorie Jauffret ◽  
Aldo Cocchi ◽  
Naim Naouar ◽  
Christian Hochard ◽  
Philippe Boisse
Keyword(s):  
Damage Mechanics ◽  
Continuum Damage Mechanics ◽  
Woven Fabric ◽  
Damage Analysis ◽  
Continuum Damage ◽  
Woven Composite ◽  
Textile Composite ◽  
Forming Process ◽  
Composite Damage ◽  
Bias Extension

The internal structure of composite materials is modified during manufacturing. The formation of woven prepregs or dry preforms changes the angle between the warp and weft yarns. The damage behaviour of the consolidated composite is modified by these changes of angle. It is important when designing a composite part to consider this modification when calculating the damage in order to achieve a correct dimensioning. In this paper, a damage calculation approach of the consolidated textile composite that takes into account the change in orientation of the yarns due to forming is proposed. The angles after forming are determined by a simulation of the draping based on a hypoelastic behaviour of the woven fabric reinforcement. Two orthogonal frames based on the warp and weft directions of the textile reinforcement are used for the objective integration of stresses. Damage analysis of the cured woven composite with non-perpendicular warp and weft directions is achieved by replacing it with two equivalent Unidirectional (UD) plies representing the yarn directions. For each ply, a model based on Continuum Damage Mechanics (CDM) describes the progressive damage. Two examples are presented, a bias extension specimen and the hemispherical forming coupon. In both cases, the angles between the warp and weft yarns are changed. It is shown that the damage calculated by taking into account these angle changes is greatly modified.

Sign in / Sign up

Export Citation Format

Share Document