26.2.1-R8 PROCESSING AND PROPERTIES OF NEW POLYIMIDE COMPOSITES WITH HIGH TEMPERATURE ABILITY

P.FERNBERG (SWEREA SICOMP), G.GONG, P.MANNBERG

The communication present work on development and evaluation of new polymeric carbon fiber composites with extreme temperature performance: Tg up to 360°C is targeted. In the work we are exploring a new phenyl ethynyl terminated imide (PETI) formulation.

26.2.1-R9 FRACTURE BEHAVIOR OF EPOXY/NANOPARTICLE NANOCOMPOSITES AT LOW AND HIGH TEMPERATURE

M.ZAPPALORTO (UNIVERSITY OF PADOVA), A.PONTEFISSO, M.QUARESIMIN, A.FABRIZI

The fracture behaviour of an epoxy/silica-nanoparticle-nanocomposite is analysed, discussing the results from CT tests. It is found that nanomodification enhances the toughness of the epoxy resin at room temperature.At higher and lower temperatures the effect of nanomodification is less evident.

26.2.1-R10 MESO-SCALE ANALYSIS OF DUCTILE STEEL FABRIC/EPOXY COMPOSITES: NUMERICAL MODELLING AND EXPERIMENTAL VALIDATION

J.FAES (GHENT UNIVERSITY), A.REZAEI, W.VAN PAEPEGEM, J.DEGRIECK

This paper studies the mechanical behavior of a steel fiber fabric reinforced epoxy composite. The innovative steel fibers have a diameter of only 30 µm. Static tensile experimental results were compared to numerical findings on an RVE finite element model.

26.2.1-R11 PARAMETRIC STUDY OF THE TENSILE BEHAVIOUR OF UNIDIRECTIONAL HYBRID CARBON/GLASS COMPOSITES

Y.SWOLFS (KU LEUVEN), RM.MCMEEKING, L.GORBATIKH, I.VERPOEST

A new model was developed to predict the failure strain of unidirectional carbon/glass hybrid composites. The failure strain was increased by up to 9% by increasing the fibre dispersion, which was explained by a delay in the cluster development.

26.2.1-R12 NOVEL INDUCTION HEATING TECHNIQUE FOR JOINING OF CARBON FIBRE COMPOSITES

C.WORRALL (TWI LTD), R.WISE, A.KAPADIA

TWI has recently invented a new method for improving the control of induction welding thermoplastic composites. Heat is focussed at the joint interface to avoid thermal damage, and therefore improves the control, and quality, of the process

26.2.1-R13 SHEETS OF POLY (LACTIDE) / O-MMT PREPARED BY ONE –STEP REACTIVE EXTRUSION-CALENDERING PROCESS

J.CAILLOUX (CENTRE CATALÀ DEL PLÀSTIC (UPC-BARCELONA TECH))), R.HAKIM, O.SANTANA, M.SANCHEZ SOTO, EB.FRANCO-URQUIZA et al.

I certify that this work is mine, original and not published in any other revues.

26.2.1-R14 TAILORING THE INTERFACIAL INTERACTIONS IN FERROELECTRIC FLUORINATED POLYMER/CERAMIC NANOCOMPOSITES

S.DALLE VACCHE (ECOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE (EPFL)), F.OLIVEIRA, Y.LETERRIER, V.MICHAUD, D.DAMJANOVIC et al.

PVDF-TrFE/BaTiO3 composites containing untreated and surface modified BaTiO3 were produced by solvent casting. The effect of the processing conditions and surface modification of BaTiO3 on their morphology and structure, and on their viscoelastic, dielectric and piezoelectric properties was investigated.

26.2.2-R8 MODELLING OF [0/90] LAMINATES SUBJECT TO THERMAL EFFECTS CONSIDERING MECHANICAL CURVATURE AND THROUGH-THE-THICKNESS STRAIN

MA.CANTERA (UNIVESITY OF THE BASQUE COUNTRY (UPV/EHU)), JM.ROMERA, I.ADARRAGA, F.MUJIKA

Non-uniform curvatures and through-the-thickness strain have been incorporated in the Extended Classical Lamination Theory to model laminates. Two expansions of curvatures, named the Mechanical and the Mathematical curvatures, have been developed. Experimental results of displacements are compared with two models

26.2.2-R9 MULTISCALE MODELING TO CHARACTERIZE THE THERMOMECHANICAL PROPERTIES OF POLYMER NANOCOMPOSITES FOR VARYING CROSSLINK RATIO

B.KIM (SEOUL NATIONAL UNIVERSITY), J.CHOI, S.YU, S.YANG, M.CHO

The effect of crosslink ratios on the thermal and mechanical properties of thermoset epoxy-based nanocomposites are determined with the aid of molecular dynamics (MD) simulations and scale bridging method. The interphase properties are further investigated using a micromechanics-based continuum model.

26.2.2-R10 MICRO-MECHANICAL MODELLING AND VALIDATION OF PROGRESSIVE ELASTO-PLASTIC DAMAGE OF SHORT WAVY STEEL FIBRE COMPOSITES

Y.ABDIN (KULEUVEN), SV.LOMOV, A.JAIN, I.VERPOEST

This paper describes modelling approaches for the prediction of the non-linear behaviour of short wavy steel fibre composites starting from extension of mean-field solutions to wavy fiber composites, models for plastic behaviour of constituents and an anisotropic damage model.

26.2.2-R11 MODE I AND MODE II FRACTURE BEHAVIOUR OF CARBON/GLASS HYBRID FILAMENT-WOUND RESIN TRANSFER MOULDED COMPOSITES

J.TAYLOR (ROLLS-ROYCE PLC.), S.FRENZ, C.CANTURRI, S.GIANNIS, G.GREENHALGH

This paper describes the results of an investigation into the Mode I and Mode II fracture behaviour of carbon/glass hybrid filament-wound RTM composite materials. The fracture mechanisms are also compared and contrasted with other fibre-reinforced composite architectures.

26.2.2-R12 CHARACTERIZATION AND MODIFICATION OF THE TEMPERATURE DISTRIBUTION DURING CONTINUOUS INDUCTION WELDING

M.HÜMBERT (INSTITUT FÜR VERBUNDWERKSTOFFE GMBH), P.MITSCHANG

This paper investigates the temperature gradient in carbon fiber reinforced polyphenylene sulfide laminates when a stack of two laminates is heated and shows that the results from single plate experiments cannot simply be transferred to continuous induction welding.

26.2.2-R13 PROCESSING AND CHARACTERIZATION OF PHBV/CLAY NANO-BIOCOMPOSITE FOAMS BY SUPERCRITICAL CO2 ASSISTED EXTRUSION

N.LE MOIGNE (CENTRE DES MATÉRIAUX - ECOLE DES MINES D'ALÈS), M.SAUCEAU, M.BENYAKHLEF, R.JEMAI, JC.BENÉZÉT et al.

A continuous sc-CO2 assisted extrusion process has been developed to prepare PHBV/clays nano-biocomposite foams. Good clay dispersion appears to favour homogeneous nucleation while limiting the coalescence, and allows to obtain nano-biocomposite foams with better homogeneity and porosity higher than 50%.

26.2.2-R14 EXPLORING THE POTENTIAL OF CONTROLLABLE STIFFNESS HYBRID COMPOSITES

P.ROBINSON, A.BISMARCK, B.ZHANG, H.MAPLES (UNIVERSITY OF VIENNA)

A composite consisting of carbon fibre reinforced epoxy laminae and polystyrene interleaf layers was shown to exhibit significant loss in flexural stiffness on heating. Trials demonstrated that the cured composite can be readily re-shaped and then fully recover on demand.

26.2.3-R8 THERMALLY-DRIVEN SNAP-THROUGH AND MULTISTABILITY USING LAMINATED FIBRE-METAL SHELLS

E.ECKSTEIN (UNIVERSITY OF BRISTOL), E.LAMACCHIA, A.PIRRERA, P.WEAVER

Fibre-metal laminated shells possessing initial cylindrical curvature are analyzed and experimentally tested. These shells display true snap-through behavior driven solely by temperature change. Additionally, the shells display deadband hysteretic behaviour, snapping at different temperatures for when heated and cooled.

26.2.3-R9 INFLUENCE OF NANOPARTICLES ON THE FATIGUE CRACK GROWTH BEHAVIOR OF EPOXY RESINS

M.KOTHMANN (UNIVERSITY OF BAYREUTH), G.BAKIS, R.ZEILER, M.ZIADEH, A.KÖPPEL et al.

In this study, the effect of spherical nanosilica and highly extended layered fluorohectorites, on the fatigue crack growth behavior is compared. The degree of toughening and the mechanisms involved are discussed regarding particle sizes and aspect ratios of the particles.

26.2.3-R10 EFFECT OF SILANE COUPLING AGENT ON INTERFACIAL STRENGTH OF STAINLESS STEEL

AK.GHOSH (VRIJE UNIVERSITEIT BRUSSEL), E.BERTELS, K.ALLAER, G.DA PONTE, D.VAN HEMELRIJCK et al.

Effect of silane surface treatment on the interfacial strength of stainless steel-polymer hybrid materials was studied. Wet deposition and atmospheric plasma deposition route were chosen to deposit the silane. Improvements of the interfacial strength upto 60 MPa were observed.

26.2.3-R11 DAMAGE MODE MAPS AND PARAMETRIC STUDY OF THIN UD HYBRID COMPOSITES

M.JALALVAND (ADVANCE COMPOSITE CENTRE FOR INNOVATION AND SCIENCE, UNIVERSITY OF BRISTOL, UK), G.CZÉL, MR.WISNOM

An analytical approach for predicting the damage process of UD hybrid composites is proposed and a new way of showing the effect of different configuration parameters on the damage process of UD hybrids, called “damage mode map”, is presented.

26.2.3-R12 EFFECT OF MESH CONFIGURATION ON THE INDUCTION WELDING PROCESS OF THERMOPLASTIC COMPOSITES

E.RODRIGUEZ SENIN (AIMEN TECHNOLOGY CENTER), I.FERNANDEZ VILLEGAS

In this work three types of metal meshes have been analysed under the effect of two induction coils with the aim of selecting the most promising for thermoplastic composites welding.

26.2.3-R13 LIFE CYCLE ASSESSMENT OF COMPOSITES USED FOR LOAD BEARING EARTH WALLS

C.GALÁN-MARÍN (UNIVERSIDAD DE SEVILLA), C.RIVERA-GÓMEZ, A.GARCÍA-MARTÍNEZ

Recent studies highlight the need to review materials and techniques in order to make the building sector more sustainable. Some conventional versus new composites materials (such as earth blocks stabilized with alginates) are evaluated according to their environmental consequences.

26.2.3-R14 INTERFACIAL CHARACTERISATION AND OPTIMISATION OF CNT FIBRES

J.TREVARTHEN (UNIVERSITY OF BRISTOL), D.JANAS, MR.WISNOM, S.RAHATEKAR, K.KOZIOL

CNT fibres have potential as a new generation of composite reinforcement, but require an effective fibre-matrix interface. By exploiting fibre porosity, we demonstrate a high-performance interface that achieves a critical interfacial shear-stress of 50.5MPa and maintains adhesion beyond 10% strain.

26.2.4-R8 THERMAL AND MECHANICAL BEHAVIOUR OF PAN AND PITCH-BASED CARBON FIBER WOVEN FABRIC REINFORCED PARTICLE FILLED EPOXY COMPOSITES

TL.NGUYEN, P.OLIVIER (ICA (INSTITUT CLÉMENT ADER))

This work consists in developing composite materials with enhanced thermal properties, especially over the transverse (through thickness) direction.

26.2.4-R10 IN-PLANE MECHANICAL PROPERTIES OF DUCTILE COMPOSITES WITH UNIDIRECTIONAL STAINLESS STEEL FIBRE REINFORCED LAYERS

K.ALLAER (GHENT UNIVERSITY), I.DE BAERE, W.VAN PAEPEGEM, J.DEGRIECK

This study introduces unidirectional stainless steel fibre reinforced epoxy composites and reports the in-plane mechanical behaviour under quasi-static tension, compression and shear loading conditions. The damage morphology of failed specimens was examined to identify the principle features of failure.

26.2.4-R11 DEVELOPMENT OF PSEUDO-DUCTILE HYBRID COMPOSITES WITH DISCONTINUOUS CARBON- AND CONTINUOUS GLASS PREPREGS

G.CZÉL (ADVANCED COMPOSITES CENTRE FOR INNOVATION AND SCIENCE, UNIVERSITY OF BRISTOL), M.JALALVAND, MR.WISNOM

The presentation reports on the pseudo-ductility demonstrated with novel unidirectional discontinuous carbon/ continuous glass sandwich hybrid composites. The stress-strain response of the new material architecture was analysed, and the pseudo yield strains of various specimen configurations were accurately predicted.

26.2.4-R12 MICROWAVE WELDING OF CARBON FIBRE REINFORCED THERMOPLASTICS

JA.GONZALEZ VECINO (TWI LTD), C.WORRALL

TWI has developed a microwave welding process for joining thermoplastic composites such as carbon fibre reinforced PEEK. Microwave welding has been investigated in the Fibrechain project as an alternative to laser welding. Lap shear strengths of 24MPa have been achieved

26.2.4-R13 LIFE CYCLE ASSESSMENT OF CFRP AIRCRAFT FUSELAGE

AJ.TIMMIS (THE UNIVERSITY OF SHEFFIELD), A.HODZIC, L.KOH, M.BONNER, A.SCHÄFER et al.

This study presents a lifecycle assessment of an all-composite airplane, based on a Boeing 787 Dreamliner. The analysis demonstrated the carbon fibre reinforced polymer structure quickly achieved a reduction in CO2 and NOx atmospheric emissions over its lifetime.

26.2.4-R14 THE INFLUENCE OF HUMIDITY AND TEMPERATURE ON GLASS FIBRE POLYAMIDE INTERFACIAL ADHESION

KA.DOWNES (UNIVERSITY OF STRATHCLYDE), JL.THOMASON

To assess the effect of moisture on IFSS for glass fibre reinforced polyamides,a microbond test rig was manufactured to carry out the procedure in TA equipment- which possesses a humidity controlled chamber. The results of these novel experiments are presented.

26.2.5-R8 VALIDATION OF A TIME-DEPENDENT MODEL FOR THERMOPLASTIC-BASED LAMINATES AT TEMPERATURES HIGHER THAN TG: HIGH STRESS GRADIENT STRUCTURES AND DIGITAL IMAGE CORRELATION

B.VIEILLE (INSA ROUEN - GROUPE DE PHYSIQUE DES MATÉRIAUX), W.ALBOUY, L.TALEB

This study was aimed at validating a numerical model accounting for the influence of viscous effects of PPS matrix on the behaviour of C/PPS laminates at temperatures exceeding its Tg

26.2.5-R11 PRODUCTION OF CONTINUOUS INTERMINGLED CF/GF HYBRID COMPOSITE VIA FIBRE TOW SPREADING TECHNOLOGY

H.DIAO (IMPERIAL COLLEGE LONDON), A.BISMARCK, P.ROBINSON, MR.WISNOM

An air-assisted fibre tow spreader was used to produce continuous commingled hybrid CF/GF tow. Its degree of hybridisation was defined as 32.45%. Compared with the CF/epoxy, the CF/GF/epoxy exhibits a more gradual tensile failure and higher failure strain.

26.2.5-R12 THERMOSET COMPOSITE ASSEMBLING METHOD BY WELDING OF THERMOPLASTIC SURFACE LAYERS: MICROSTRUCTURE AND TOUGHNESS OF THE RESULTING THERMOPLASTIC/EPOXY RESIN INTERFACES

Q.VOLEPPE (UNIVERSITÉ CATHOLIQUE DE LOUVAIN-LA-NEUVE (UCL)), T.PARDOEN, C.BAILLY

The relationship between the morphology gradient and the damage properties of thermoplastic/thermoset interfaces based on the RTM6 epoxy resin is investigated as a function of various curing cycles and of two different thermoplastics polymers : poly(ether sulfone) and poly(ether imide).