24.3.1-R8 ANALYSIS OF THE UNSATURATED FLOW IN A DOUBLE SCALE POROUSITY PREFORM DURING LIQUID COMPOSITE PROCESS

S.KIM (SEOUL NATIONAL UNIVERSITY), CH.PARK, M.LI, WI.LEE

Unsaturated and saturated permeability values were obtained for different flow rates experimentally. Based on the experimental result, we suggest a model for the ratio of unsaturated permeability to saturated permeability in terms of void content, liquid properties and preform microstructure.

24.3.1-R9 KNOWING THE LIMITS OF A TREND: EXAMINING THE ONSET OF ASYMPTOTIC STABLE FRACTURE BEHAVIOUR IN MODE II FATIGUE DELAMINATION GROWTH

C.RANS (DELFT UNIVERSITY OF TECHNOLOGY), J.ATKINSON, C.LI

This study investigates the possibility that experimental data sets, particularly those obtained at high R-ratios, may unknowingly contain data within the asymptotic stable fracture region. Implications of this on fatigue delamination growth characterization and modelling are discussed.

24.3.1-R10 AFOSR.3/3

24.3.1-R11 DAMAGE MECHANISMS INTO SHORT GLASS FIBRE REINFORCED THERMOPLASTIC DURING IN SITU MICROTOMOGRAPHIC TENSILE TESTS

H.ROLLAND (I2M - ARTS ET MÉTIERS PARISTECH), N.SAINTIER, G.ROBERT

In situ microtomography tensile tests were undertaken to investigate the link between SGFR-thermoplastics microstructure and their damage mechanisms. 3D-pictures of specimens at different deformation stages confirm mechanisms described in the literature, but additional role of fibre failure modes are evidenced.

24.3.1-R12 IMPACT TEMPERATURE AND THERMAL CYCLING AGEING ON PERFORMANCE OF 3D WOVEN COMPOSITES WITH POLYMER MATRIX MANUFACTURED BY RTM

C.GUIGON (PPRIME INSTITUTE), MC.LAFARIE-FRENOT, Y.PANNIER, L.OLIVIER, C.RAKOTOARISOA

This study aims to understand damage mechanisms in carbon/epoxy 3D woven composites submitted to thermal cycles. Work is in progress to determine the effect of the fibrous architecture and the impact of the ageing environment on microcracks path and depth.

24.3.1-R13 EXPERIMENTAL CHARACTERISATION AND MODELLING OF NON-LINEAR STRESS-STRAIN BEHAVIOUR AND STRAIN RATE EFFECTS FOR UNIDIRECTIONAL CARBON-EPOXY

H.KOERBER (TECHNISCHE UNIVERSITAET MUENCHEN), M.VOGLER, P.KUHN, P.CAMANHO

IM7-8552 was investigated for combined transverse tension-shear loading at static and dynamic strain rates. Failure envelopes were derived and compared with the Puck IFF Mode-A failure criterion. The axial stress-strain response was simulated using a 3D transversely-isotropic elastic-viscoplastic constitutive model.

24.3.1-R14 ANALYTICAL AND NUMERICAL SIMULATIONS OF THE BEHAVIOUR OF 2,5D-BRAIDED INTERLOCK COMPOSITE TUBES UNDER CRUSH LOADING

C.PRIEM (ECOLE CENTRALE DE NANTES), R.OTHMAN, P.ROZYCKI, D.GUILLON, A.MARTIN

The experiment and numerical simulation of the crash of composite tubes made of 2,5D-braided composite is studied. After the characterization a bi-phase model have been developed based on Drozdov's modelling of thermoplastic matrix and on the kinking model of fibers.

24.3.2-R8 INPUT DATA DETERMINATION FOR RTM SIMULATION OF COMPOSITE MATERIALS

M.LASPALAS (INSTITUTO TECNOLÓGICO DE ARAGÓN), M.LIZARANZU, M.CASTRILLÓN, Á.GIMENO, S.IZQUIERDO et al.

Accurate RTM simulation requires precise determination of input properties of reinforcements and resins. In this paper, an example of characterization and associated models adjustment is presented. The contribution focuses on the reinforcement permeability measurement and resin rheology and cure kinetics.

24.3.2-R9 FATIGUE OF GLASS FIBRE REINFORCED POLYMERS FOR OCEAN ENERGY

C.KENNEDY (NUI GALWAY), C.O' BRÁDAIGH, S.LEEN

This paper presents a combined experimental and computational study on the fatigue of glass-fibre reinforced polymers (GFRP), with particular emphasis on the effects of water saturation, for use in ocean energy structures.

24.3.2-R11 MASTER SN CURVE METHOD FOR SHORT FIBER COMPOSITES- THEORY AND EXPERIMENTAL VALIDATION

A.JAIN (LMS INTL-A SIEMENS BUSINESS/ KULEUVEN), JM.VEAS, SV.LOMOV, Y.ABDIN, S.STRAESSER et al.

A hybrid multi-scale method of predicting the SN-curve for every point in a random fiber composite(RFRC)is presented. An test program to study the fatigue behavior of RFRC and validate the concept of the Master-SN-curve is presented

24.3.2-R12 THE INFLUENCE OF HEAT DURING SHORT AGEING PERIODS ON THE MECHANICAL PROPERTIES OF CFRP COMPOSITES

JL.MERINO (THE UNIVERSITY OF SHEFFIELD), S.AYVAR-SOBERANIS, E.MERSON, A.HODZIC

In order to evaluate the influence of heat developed during the composites machining process, the presented work studied the effect of heat during short ageing periods on the properties of carbon fibre reinforced polymer (CFRP) composites.

24.3.2-R13 NUMERICAL CALIBRATION OF THE MECHANICAL PROPERTIES OF AN ADHESIVE MATERIAL

F.RIERA (PRINCIPIA INGENIEROS CONSULTORES), P.GONZÁLEZ, J.GONZÁLEZ

24.3.2-R14 NONDESTRUCTIVE EVALUATION OF IMPACT DAMAGE IN GLASS AND CARBON REINFORCED COMPOSITES BASED ON INFRARED THERMOGRAPHY METHODS

L.KRSTULOVIĆ-OPARA (UNIVERSITY OF SPLIT), Ž.DOMAZET, E.GARAFULIĆ

Application of active infrared thermography has been demonstrated on carbon and glass polymer composites. Several image processing methods have been applied on damaged specimens, demonstrating abilities of thermography as a non-destructive testing method.

24.3.3-R8 IN-SITU POLYMERIZED CONTINUOUS FIBER THERMOPLASTIC COMPOSITE MANUFACTURED THROUGH LIQUID MOLDING PROCESSES

A.DE LA CALLE (TECNALIA), S.GARCIA, C.ELIZETXEA

Composites with APA6 thermoplastic matrix were manufactured, reinforced with glass and carbon fabrics. A semi-industrial equipment specifically designed for this process was used. When the values of fiber weights and percentages where optimized, a complete mechanical characterization was carried out.

24.3.3-R9 PROGRESSIVE FATIGUE DAMAGE IN 3D MODIFIED LAYER-TO-LAYER WOVEN COMPOSITES CHARACTERISED BY X-RAY TOMOGRAPHY

B.YU (THE UNIVERSITY OF MANCHESTER), J.STEIN, F.LEONARD, P.WITHERS, C.SOUTIS

This study investigates the development of fatigue damage in 3D woven composites, exploring the effect of fibre architecture on damage evolution. The results obtained from the mechanical tests were supplemented by the progressive damage observation using X-ray computed tomography (CT).

24.3.3-R11 THROUGH PROCESS MODELLING FOR THE FATIGUE LIFE ASSESSMENT OF NOTCHED INJECTION-MOLDED SPECIMENS

S.CASTAGNET (INSTITUT PPRIME - ENSMA), C.NADOT-MARTIN, A.BERNASCONI, E.LAINÉ, E.CONRADO et al.

The “Through Process Modeling” method, proposed for multiaxial fatigue life assessment of injection-molded short-fiber reinforced thermoplastic components, is applied here to notched samples of PA6GF30 at room temperature. Fiber disorientation and stress concentration effects are discussed.

24.3.3-R12 CHARACTERIZATION OF SEA WATER AGEING EFFECTS ON MECHANICAL PROPERTIES OF CARBON/EPOXY COMPOSITES FOR TIDAL TURBINE BLADES

N.TUAL (ENSTA BRETAGNE / IFREMER), N.CARRERE, P.DAVIES, T.BONNEMAINS, E.LOLIVE

The renewable marine energies represent a major economic and political development. The purpose of this paper is to propose an experimental approach to characterize the long term behavior of different carbon/epoxy composites for tidal turbine blades.

24.3.3-R13 NUMERICAL ANALYSIS OF FAILURES IN COMPOSITE LAMINATES USING MULTISCALE MODELLING

D.MORAES, P.SOLLERO (UNIVERSITY OF CAMPINAS), EL.ALBUQUERQUE

This paper presents a multiscale numerical analysis of failure in laminates. The macroscale uses BEM for anisotropy. The microscale uses the multi-domain BEM formulation. Failure of RVE is evaluated by criteria of Tsai-Hill for matrix and maximum deformation for fiber.

24.3.3-R14 EXPERIMENTAL AND NUMERICAL INVESTIGATIONS OF LOW-VELOCITY IMPACT BEHAVIOR OF SELECTED FIBRE METAL LAMINATES

J.BIENIAŚ (LUBLIN UNIVERSITY OF TECHNOLOGY), P.JAKUBCZAK, B.SUROWSKA, H.DĘBSKI

This work presents a numerical analysis of impact response of aluminium hybrid laminates with glass and carbon fibres reinforced polymer matrix. Verification of numerical analyses was conducted with experimental methods.

24.3.4-R8 PERMEABILITY OF SHEARED WOVEN FLAX FIBRES REINFORCEMENTS; DEFINITION OF PARAMETERS TO MODEL COMPLEX SHAPE COMPOSITES PART PROCESSING BY LCM

PJ.LIOTIER (ECOLE DES MINES DE SAINT-ETIENNE), Q.GOVIGNON, E.SWERY, S.DRAPIER, S.BICKERTON

This paper describes a method to characterise the influence of in-plane shear on the permeability of fibrous preforms. An optical method for measuring the local shear of the woven textile is presented. The aim is to define the permeability orientation.

24.3.4-R9 ACCELERATED FLEXURAL FATIGUE TEST RIG TO CHARACTERIZE HIGH STRENGTH COMPOSITE MATERIALS

M.ASENSIO, MJ.CABELLO, F.MARTINEZ (IK4-IKERLAN RESEARCH ALLIANCE), MJ.LAMELA

Accelerated flexural fatigue test rig for bending tests up to 20 Hz. New five-point bending setup with rotating supports reaching boundary conditions similar to a clamped one. Application of fatigue statistical model to reduce tests to obtain material fatigue properties

24.3.4-R12 INFLUENCE OF EPOXY/GLASS FIBRES INTERFACE/INTERPHASE ON WATER DIFFUSION KINETICS: EXPERIMENTAL AND NUMERICAL APPROACH

Y.JOLIFF (UNIVERSITY OF TOULON), L.BELEC, JF.CHAILAN

Study deals with water diffusion in unidirectional composite. AFM measurements show a decrease of the stiffness at decreasing distance from the interface. A matrix diffusion coefficient higher than the bulk resin one must be used to fit correctly the experimental.

24.3.4-R13 CRACK PROPAGATION IN MICRO-ENCAPSULATED POLYMERS FOR SELF-HEALING: NUMERICAL MODELLING AND EXPERIMENTAL VALIDATION

D.GAROZ (GHENT UNIVERSITY), FA.GILABERT, K.ALLAER, X.HILLEWAERE, F.DU PREZ et al.

Self-healing polymers have the ability to repair damage caused by mechanical usage, such as cracks, avoiding or delaying the mechanical failure. We have numerically studied the crack propagation in order to model the behaviour of the self-healing polymers.