C composites forming

C. COMPOSITES FORMING

Characterising the Formability of Engineering Fabrics Using a Biaxial Bias Extension Test
P Harrison (Univ of Glasgow)
Biaxial Bias Extension tests have been performed on various engineering fabrics under different in-plane tension conditions. The test results have been normalised using both the upper and lower bound method proposed by Potluri et al. [1] and also using a novel alternative normalisation method based on energy arguments [2]. Normalised bias extension test data are compared with picture frame test data. (C1:1)


Simulation and Tomography Analyses of Textile Composite Reinforcement
E Vidal-Sallé, P Badel, E Maire, L Bigorgne, P Boisse (INSA Lyon)
A simulation method for woven composite fabric deformation at mesoscopic scale is presented together with a specific continuum hypo-elastic constitutive model. X-ray tomography is used to obtain undeformed and deformed 3D geometries of the reinforcements. Comparisons between numerical and experimental deformed geometries are shown. (C1:2)

Viscoelastic Characterization of Continuous Fibre-Reinforced Thermoplastic Composites in Thermoforming Process
MT Abadi (Aerospace Research Institute)
This paper describes a micromechanical model to predict viscoelastic behaviour of the thermoplastic composites consisting of viscoelastic melted resin and unidirectional hyperelastic fibres. A representative unit cell generated by random sequential adsorption algorithm is subjected to some prescribed macroscopic large deformations to determine time-dependent behaviour of thermoplastic composites at the forming temperature. (C1:3)

Multiscale Modelling: Yarn Deformation to Draping Simulation of Woven Preforms
R Ramgulam, P Potluri, M Chilo (Univ of Manchester)
The objective is to simulate the geometry and forming forces in a woven preform draped over a complex surface and loaded only at its boundaries. Multiscale modelling approach, starting from fibre properties, has been employed in order to eliminate the uncertainties of material testing at intermediate scales. (C1:4)

On the Formability of Multi-Layered Fabric Composites
K Vanclooster, S Lomov, I Verpoest (KU Leuven)
A forming limit diagram, which visualizes the formability of multilayered fabric composites, is presented. A drastic decrease in formability is noticed when the relative orientation between two neighbouring fabrics increases. By increasing the interlaminar thickness between the fabric layers the formability can be increased. (C1:5)

Advances in Measurement of Shear and Friction of Woven Fabrics for Forming
J Chen, D Jauffres, K Fetfasidis, D Winchester, J Sherwood (Univ of Massachusetts)
Fabrics provide a challenge to the standard materials characterization methods used to generate input properties for forming simulations. This paper addresses recent advances in measurement of shear and friction properties, along with insights gained from studies of dry fabric, commingled fabrics, and fabric-reinforced sheet moulding compound. (C1:6)

11.30
Composite Reinforcement Forming Simulation: A Multiscale Approach

P Boisse, N Hamila, A Khan , S Gatouillat , E De Luycker, E Vidal-Salle, T Mabrouki (INSA Lyon)
NEEDS 50 WORD ABSTRACT

(C1:7)

Characterization of an Aeronautic Composite Material During the Manufacturing Process - Experimental Study of the Process Induced Residual Stresses Through-The-Thickness
A Poitou, YA Msallem, F Jacquemin (Ecole Centrale de Nantes) N Boyard, D Delaunay (Univ de Nantes) S Chatel (EADS)
A mechanical and thermal characterization during the manufacturing process of an aeronautic composite material is reported in this work. An experimental approach based on the peel-ply-method allows deducing the process induced residual stresses through the thickness. (C1:8)

Mesoscopic Finite Element Modelling of Woven Reinforcements Applied to Sheet Moulding Compound Forming Simulation
D Jauffres, JA Sherwood, J Chen, C Morris, J Kremer (UMass-Lowell)
A mesoscopic finite element approach using a combination of 1-D and 2-D elements is proposed to model the complex and highly nonlinear deformation behaviour of woven fabrics. To demonstrate the capabilities of the method, the drapability of an actual automotive part is studied. (C1:9)


High Speed Moulding of Carbon Fiber Reinforced Plastic Based on Non-Woven Stitched Multi-Axial Cloth Using Induction Heating System
K Tanaka, T Katayama (Doshisha Univ) K Uno (Marubeni Co Ltd)
High speed moulding process of Carbon Fibre Reinforced Thermoplastics using induction heating system in combination with non-woven stitched multi-axial cloth (NSMC) was proposed. NSMC is a novel material system, in which non-woven fabric plays a supporting material of non-crimp stitched fabric and at the same time will be the matrix of composites. (C1:10)

Pressure Distribution and Surface Quality During Forming of Thermoplastic Composites with a Collection of Rubber Particles as Mould Half
V Antonelli, S Lindstedt, R Marissen (TU Delft) R Carbone (Universita)
The present paper shows the influence of the rubber hardness and the particles’ shape and dimensions on the pressure distribution during Hylid forming. Results show that the hardness of the rubber influences the uniformity of the pressure distribution, while the shape of the particles allows for a better surface quality. (C1:11)