25.1.1-R8 CONSTITUTIVE COMPATIBILITY BASED ELASTIC PARAMETER IDENTIFICATION WITH A DOMAIN DECOMPOSITION APPROACH

L.GILLES, A.MOUSSAWI (KAUST), X.JIANGPING, R.GRAS

We present the constitutive compatibility method (CCM), an innovative method for the identification of local elastic parameters in constitutively heterogeneous materials through full-field data. A new development, where the CCM is incorporated into a domain decomposition strategy is demonstrated.

25.1.1-R9 A MULTIPLE SPECIMEN METHODOLOGY FOR CRACK GROWTH UNDER FATIGUE LOADING OF DOUBLE CANTILEVER BEAM SPECIMENS

J.RENART, S.BUDHE, J.COSTA (UNIVERSITAT DE GIRONA.), A.RODRÍGUEZ-BELLIDO

In order to reduce the testing duration and to establish a robust methodology to characterize delamination growth under fatigue loading, a multi-specimen setup for mode I tests has been developed. Onset and crack growth rate curves are presented as examples.

25.1.1-R10 FIRE BEHAVIOUR OF CARBON FIBRE COMPOSITES UNDER LOAD

AG.GIBSON (UNIVERSITY OF NEWCASTLE), P.DI MODICA, G.KOTSIKOS

This paper discusses the measurement and modelling of fire behaviour of CFRP. Important phenomena include resin decomposition, volatile evolution and nonlinear transport properties. This paper will discuss how high quality information can be obtained from small-scale, low cost tests.

25.1.1-R11 FIBER LENGTH EFFECT ON TENSILE AND COMPRESSIVE STRENGTH OF SHORT FIBER REINFORCED THERMOPLASTICS

Y.WAN (THE UNIVERSITY OF TOKYO), J.TAKAHASHI

Tensile and compressive properties of carbon fiber reinforced thermoplastics were studied with different fiber aspect ratio. The result shows different effect of fiber length on the strength and modulus of the material.

25.1.1-R12 TOWARDS IMAGE-BASED HOMOGENIZATION BY COMBINING SCANNING TECHNIQUES AND REDUCED ORDER MODELING

E.LÓPEZ (ECOLE CENTRALE NANTES), E.ABISSET-CHAVANNE, C.GHNATIOS, S.COMAS-CARDONA, C.BINETRUY et al.

Microscopic heterogeneities require to define homogenized properties depending on microscopic details. Real time image-based calculations demand local homogenized properties of a heterogeneous material at different scanning scales fastly. Model reduction techniques allow to perform such kinds of efficient high-resolution homogenization.

25.1.1-R13 PRODUCTION AND PROCESSING OF THERMOPLASTIC BASED TOWPREGS FOR COMMERCIAL AND ADVANCED MARKETS

JP.NUNES (INSTITUTE OF POLYMERS AND COMPOSITES/I3N, MINHO UNIVERSITY, 4800-058 GUIMARÃES, PORTUGAL), PJ.NOVO, JF.SILVA, A.TORRES MARQUES

Continuous fibre reinforced thermoplastic matrix towpregs were produced for commercial markets and advanced markets. The former based on glass fibre reinforced polypropylene matrix (GF/PP) and the latter on carbon fibre Primospire matrix (CF/Primospire). Both towpregs were processed into composites.

25.1.1-R14 INVARIANT-BASED FAILURE CRITERIA FOR COMPOSITE LAMINATES

P.CAMANHO (UNIVERSITY OF PORTO), A.ARTEIRO, M.VOGLER

25.1.2-R8 CHARACTERISATION OF THE TENSILE AND FRACTURE PROPERTIES OF FILAMENT WOUND CARBON FIBRE RINGS

G.ABED (UNIVERSITY OF SHEFFIELD), C.PINNA, J.FOREMAN, SA.HAYES

Hoop strength of filament wound CFRP composite rings is obtained using the split-disk test method. Digital Image Correlation technique is used for full-field strain measurements together with strain gauges. Video camera is used to capture crack initiation and final failure.

25.1.2-R9 FATIGUE BEHAVIOUR OF FLAX REINFORCED COMPOSITES

F.BENSADOUN (KU LEUVEN), J.BAETS, AW.VAN VUURE, I.VERPOEST

The present study focuses on the characterization and evaluation of tentsion tension fatigue behaviour of flax-epoxy composites. A better understanding of this behaviour allows the prediction of long-term properties to assess the viability and long-term durability of these materials.

25.1.2-R10 FIRE-RETARDANT EPOXY MATRICES DESIGNED FOR COMPOSITE MATERIALS PROCESSED BY INFUSION

S.LAIK (INSA LYON), J.GALY, JF.GÉRARD, M.MONTI, G.CAMINO

The epoxy/amine networks contained 4wt% of trisilanolPhenyl POSS as a fire retardant, with or without an aluminium catalyst. Complex morphologies (TEM) and large fire retardance improvements (UL94 and cone calorimeter) were observed in the POSS-containing formulations.

25.1.2-R11 MICROSTRUCTURAL CHARACTERIZATION OF STONE WOOL FIBRE NETWORK

L.CHAPELLE (ROCKWOOL INTERNATIONAL A/S), P.BRØNDSTED, Y.KUSANO, MR.FOLDSCHACK

Understanding the mechanical properties of stone wool materials requires a relevant description of their microstructure. In this study, different methods have been proposed to characterize the fibre orientation, diameter and length as well as the density of fibre contacts.

25.1.2-R12 NUMERICAL SIMULATION OF THE LIQUID COMPOSITE MOLD FILLING PROCESS WITH VOID FORMATION USING TWO-PHASE POROUS MEDIA THEORY

L.GASCÓN, JA.GARCÍA (UNIVERSITAT POLITÉCNICA DE VALENCIA), E.RUIZ, F.TROCHU

We present a procedure to simulate Liquid Composite Molding processes with void formation. Numerical results using a FEM code for the pressure/velocity equation and a high order essentially non-oscillatory technique for the saturation have been compared with measured saturation profiles.

25.1.2-R13 PROCESSING OF CHARACTERISATION OF CARBON FIBRE REINFORCED PEEK WITH DISCONTINUOUS ARCHITECTURE

N.EGUÉMANN, L.GIGER, K.MASANIA, C.DRANSFELD (UNIVERSITY OF APPLIED SCIENCES AND ARTS NORTHWESTERN SWITZERLAND FHNW), F.THIEBAUD et al.

This work evaluates the eligibility of a process based on compression moulded thermoplastic chopped tapes as a candidate to replace complex metal parts. Due to their discontinuous character, such materials are subject to scale effects, which are discussed in detail.

25.1.2-R14 ANALISYS OF TRANSVERSE CRACKING IN UNIDIRECTIONAL COMPOSITE PLIES BY MEANS OF COMPUTATIONAL MICROMECHANICS

DF.MORA MENDEZ (IMDEA MATERIALS), CD.GONZÁLEZ, CS.LOPES, J.LLORCA

To capture the insitu failure mechanisms in the transverse direction in a [0/90]s E-glass/Epoxy, an RVE of the composite microstructure is simulated by using a FEA to capture the main damage mechanism and the consequence crack density.

25.1.3-R8 IN SITU ON-LINE CURE MONITORING OF COMPOSITES BY EMBEDDED INTERDIGITAL SENSOR

Y.YANG (CENTRE FOR MICROSYSTEMS TECHNOLOGY (CMST), IMEC AND GHENT UNIVERSITY), G.CHIESURA, G.LUYCKX, F.BOSSUYT, T.VERVUST et al.

In this presentation, current progress in the development of a dielectric sensor system, by the use of an interdigital sensor, for in situ and on-line cure monitoring of polymeric composites is presented.

25.1.3-R9 FATIGUE BEHAVIOR OF THROUGH THE THICKNESS REINFORCED JOINTS

S.STELZER (MONTANUNIVERSITÄT LEOBEN), S.UCSNIK, H.SEHRSCHÖN, J.TAUCHNER, G.PINTER

Fatigue measurements on SLS specimens made of CFRP were carried out. The interfaces of the specimens were reinforced with metallic pins in the through thickness direction. Stiffness based analysis methods were used to better understand the failure behavior.

25.1.3-R10 INVESTIGATIONS INTO LIGHTWEIGHT SOLUTIONS FOR IMPROVEMENT OF FIRE PROPERTIES OF EPOXY COMPOSITES

P.PARLEVLIET (AIRBUS GROUP INNOVATIONS)

Aim is to improve fire properties of epoxy-composites with interlayers, without compromising the structural performance: carbon-fibre veil with expandable graphite, flame-retardant thermoplastic film or a CF reinforced thermoplastic (CFTP) layer. Most promising seems CFTP layer, while mechanical performance appears unaffected.

25.1.3-R11 MICRO-MECHANISMS OF FATIGUE IN SHORT GLASS FIBER REINFORCED POLYAMIDE 66: A MULTI-SCALE EXPERIMENTAL ANALYSIS

B.ESMAEILLOU, J.FITOUSSI (ENSAM PARIS), F.MERAGHNI, A.TCHARKHTCHI

The aim of this work is to identify the main micro-mechanisms which govern the fatigue behavior of a short glass fiber reinforced polyamide 66 composite through a multi-scale experimental analysis.

25.1.3-R12 MODELING THE HEAT DISTRIBUTION OF A COMPOSITE LAMINATE DURING ULTRASONIC COMPACTION WITH THE PGD

J.JUSTO (UNIVERSIDAD DE SEVILLA), F.CHINESTA, E.GRACIANI, C.GHNATIOS, F.PARÍS

The heat distribution during the ultrasonic compaction process of composite laminates is modelled with the Proper Generalized Decomposition (PGD). The results are compared with experimental measurements.

25.1.3-R13 THERMOPLASTIC COMPOSITE PARTS BASED ON ONLINE SPUN COMMINGLED HYBRID YARNS WITH A CONTINUOUS CURVILINEAR FIBRE PATTERNS

E.RICHTER (LEIBNIZ-INSTITUT FÜR POLYMERFORSCHUNG DRESDEN), K.UHLIG, A.SPICKENHEUER, L.BITTRICH, E.MÄDER et al.

Two innovative technologies developed at Leibniz-IPF (SpinCOM und AOPS) enabling in combination an easy, effective and reliable way to design and manufacture structural components with thermoplastic matrix material and a load optimized continuous curvilinear fibre pattern for lightweight applications.

25.1.3-R14 FRACTURE MECHANICS ON MICROSCALE OF COMPOSITE PLIES UNDER TRANSVERSE LOADING

C.MAROTZKE (BAM), T.FELDMANN

The energy release rate during debonding of a fiber is analysed. The dependency of the mixed mode energy release rate on the increment size is shown. Accordingly the discrimination into mode I and mode II energy release rate is questionable.

25.1.4-R8 TESTING OF FIBRE REINFORCED COMPOSITES

R.STREHLE (ZWICK GMBH & CO KG), F.HELMUT

An overview about the most common mechanical testing methods on fibre reinforced composites are shown. Tensile, IPS, flexure, ILS, shear methods, energy release rate in mode I, mode II and mixed mode I/II combined in a single UTM.

25.1.4-R9 A TOOL FOR THE SIMULATION OF FATIGUE DAMAGE EVOLUTION IN MULTIDIRECTIONAL LAMINATES

PA.CARRARO, L.MARAGONI (UNIVERSITY OF PADOVA), M.QUARESIMIN

A software tool is presented to predict the crack density evolution in the off-axis layers of multidirectional laminates under fatigue loading, and to estimate the stiffness drop due to the presence of off-axis cracks.

25.1.4-R10 NOVEL FST THERMOSET SOLUTION FOR COMPOSITE STRUCTURE

V.YQUEL (HUNTSMAN ADVANCED MATERIALS), O.DE VERCLOS, K.SCOBBIE

Huntsman Advanced Materials has developed an entirely new high-performance and inherently flame resistant, halogen free, solution for RTM and infusion composite processes enabling efficient production of interior carbon and glass composites parts with maximised weight savings.

25.1.4-R11 FATIGUE DESIGN OF SHORT FIBRE REINFORCED POLYMERS

D.SPANCKEN (FRAUNHOFER INSTITUT LBF DARMSTADT), J.DECKER, P.BECKER, C.CONTELL ASINS, A.BÜTER

The results achieved in investigations of the fatigue design and the durability performance of a complex short fibre reinforced structural component, the “Multi Tester”, are presented. The MultiTester is a novel internal pressure test specimen.

25.1.4-R12 ADVANCED SIMULATION OF THE LASER-ASSISTED TAPE PLACEMENT PROCESS

C.DEDIEU (GEM, UMR CNRS, ECOLE CENTRALE DE NANTES), F.CHINESTA, A.BARASINSKI, A.LEYGUE, B.LORENTE et al.

This study takes place in the context of modeling the laser assisted tape-placement process. In order to link the parameters of the process to the quality of the fabricated part, a new thermomechanical modeling strategy is presented.

25.1.4-R13 PROCESSING AND RECYCLING OF A THERMOPLASTIC COMPOSITE CARBON FIBRE/PEEK AEROSPACE PART

M.ROUX (UNIVERSITY OF APPLIED SCIENCES AND ARTS NORTHWESTERN), C.DRANSFELD, N.EGUÉMANN, L.GIGER

In this work, the authors present a cradle to cradle procedure of a complex aerospace part, manufactured with PEEK thermoplastic composite chopped tapes using compression molding and recycled with an electrodynamic fragmentation process.

25.1.4-R14 INFLUENCE OF RESIDUAL THERMAL STRESS IN CARBON FIBER REINFORCED THERMOPLASTIC COMPOSITES ON THE FIBER-MATRIX INTERACTION EVALUATED BY SINGLE-FIBER PUSH-OUT TESTS

M.GREISEL (UNIVERSITY OF AUGSBURG), J.JÄGER, J.MOOSBURGER-WILL, M.SAUSE, WM.MUELLER et al.

The investigations conducted demonstrate the influence of residual thermal stress inherently present in heat pressed carbon fiber-reinforced thermoplastic composites on the interfacial fracture toughness. This material parameter is evaluated by a detailed energy analysis of cyclic single-fiber push-out tests.