25.2.1-R8 PHYSICAL PROPERTIES OF PARTIALLY CROSS-LINKED RTM6 EPOXY RESIN

J.MOOSBURGER-WILL (UNIVERSITY OF AUGSBURG), M.GREISEL, M.SAUSE, R.HORNY, S.HORN

Thermo-physical and mechanical properties of partially cross-linked tetra-functional RTM6 epoxy resin samples in the glassy state are investigated as function of the curing degree. A significant dependence of glass transition temperature, density and modulus on the curing degree is found.

25.2.1-R9 CFRP ANCHORAGE SYSTEM FOR CFRP STRENGTHENED BEAMS

H.RASHEED (KANSAS STATE UNIVERSITY), B.DECKER, A.ESMAEILY, R.PETERMAN, H.MELHEM

This research is intended to verify the effectiveness of using U-wrap CFRP anchorage to increase the flexural strength of externally bonded FRP composites. Proper anchorage is anticipated to shift the failure mode from delamination/debonding to FRP rupture or concrete crushing.

25.2.1-R10 FIRE PERFORMANCE OF BASALT FIBRE COMPOSITES UNDER TENSILE LOADING

S.FEIH (RMIT UNIVERSITY), T.BHAT, A.RAHMAN, V.CHEVALI, X.LIU et al.

The fire structural resistance of a basalt fibre composite is determined experimentally and analytically. Due mainly to the material’s lower emissivity, its fire structural survivability was inferior to a glass fibre laminate when exposed to the same radiant heat flux.

25.2.1-R11 MULTI-SCALE VISCOELASTIC DAMAGE MODEL OF SHORT GLASS FIBER REINFORCED THERMOPLASTICS UNDER FATIGUE LOADING

N.DESPRINGRE (ARTS & MÉTIERS PARISTECH), Y.CHEMISKY, MF.ARIF, G.ROBERT, F.MERAGHNI

This work presents a new micromechanical fatigue damage model for short glass fiber reinforced polyamide-66. A modified Mori-Tanaka method is developed and includes coated reinforcements, nonlinear matrix viscoelasticity and microscale damage processes that are coupled to local stress fields.

25.2.1-R12 APPLICATION OF THE PROPER GENERALIZED DECOMPOSITION METHOD TO POLYMER VISCOELASTICITY UNDER CYCLIC LOADING

M.BERINGHIER (INSTITUT PPRIME), M.HAMMOUD, JC.GRANDIDIER

The PGD method is used to simulate the cyclic loading of a polymer specimen. Viscoelasticity being described by the internal variables evolution, the globalization of the local models is investigated. Decreasing computation time by using adapted time discretizations is discussed.

25.2.1-R13 FLEXURAL CHARACTERISATION OF UNIDIRECTIONAL THERMOPLASTIC TAPES USING A DYNAMIC MECHANICAL ANALYSIS SYSTEM

A.MARGOSSIAN (TECHNICAL UNIVERSITY OF MUNICH), M.DING, L.AVILA GRAY, S.BEL, R.HINTERHÖLZL

Flexural properties of unidirectional PA6 tapes are investigated using a Dynamic Mechanical Analysis system. Four different setups (cantilevers, 3-point-bendings) and two types of specimens are assessed. Quasistatic tests are subsequently conducted to assess temperature and loading rate dependencies.

25.2.1-R14 INTER-FIBRE FAILURE UNDER COMPRESSION: BIAXIAL LODING.

E.CORREA (UNIVERSITY OF SEVILLE), F.PARÍS, V.MANTIČ

The influence of a secondary load, perpendicular to the transverse compression nominally responsible for the failure, on the matrix failure is studied. The problem is analysed by means of micromechanical Boundary Elements models and using Interfacial Fracture Mechanics concepts.

25.2.2-R8 INTERPRETING DATA FROM FOUR-POINT BENDING TESTS OF ANGLE-PLY LAMINATES - TEST SET UP, EDGE AND WIDTH EFFECTS

D.WOWK (ROYAL MILITARY COLLEGE OF CANADA), CC.MARSDEN, D.THIBAUDEAU

The response of composite laminates to in-plane and out-of-plane loading can be evaluated using bending tests. The current work uses three-dimensional finite element simulations to predict the internal stresses for thin laminates under bending.

25.2.2-R9 DEVELOPMENT OF COMPOSITE PANELS BASED ON FIBROUS MATERIALS FOR THE MANUFACTURING OF MODULAR HOUSING

R.FANGUEIRO (UNIVERSITY OF MINHO), S.PATINHA, F.CUNHA, S.RANA, F.PREGO

The present work describes the development process of a sandwich composite panel for application in modular housing in developing countries.The sandwich panel was developed with a double skin made of fibres combined with polyurethane core.

25.2.2-R10 MODELLING THE STRUCTURAL RESPONSE OF FIBRE-REINFORCED COMPOSITES SUBJECTED TO FIRE

R.GUTKIN (SWEREA SICOMP), H.OLSEN, P.BLOMQVIST

The development and implementation of dedicated material models for the finite element computation of the response of polymer composite structures subjected to fire is presented. The models are validated against a mini furnace experiment.

25.2.2-R11 MODELLING AND VALIDATION OF FATIGUE LIFE CALCULATION METHOD FOR SHORT FIBRE REINFORCED INJECTION MOULDED PARTS

A.MÖSENBACHER (MONTANUNIVERSITÄT LEOBEN), J.BRUNBAUER, PF.PICHLER, C.GUSTER, G.PINTER

The quasi-static and fatigue behaviour of a fibre reinforced polyetherimide was investigated. Based on the test results, models describing influences on fatigue life were deduced. As validation fatigue life calculation was applied to a real part which shows good results.

25.2.2-R12 HYBRID THERMOPLASTIC YARN TO 3D COMPLEX SHAPED THERMOPLASTIC COMPOSITE STRUCTURE: SIMULATION OF BRAIDING AND SUBSEQUENT CONSOLIDATION.

YD.KERGOMARD (ESI GROUP), M.PERRIN, A.TRAMEÇON, P.DE LUCA

This paper introduces to the simulation of commingled thermoplastic composites manufacturing, that is a braiding process followed by a thermo-compression.

25.2.2-R13 TOUGHENED CARBON FIBRE FABRIC-REINFORCED THERMOPLASTIC COMPOSITES

T.ABT, M.SANCHEZ SOTO (CENTRE CATALA DEL PLÀSTIC. (UPC-BARCELONA TECH)), ML.MASPOCH, JI.VELASCO

Epoxy and isocyanate toughened CF reinforced pCBT composites were studied. ILSS, flexural strength and failure strain increased up to 50 to 60% with respect to unmodified pCBT composites, whereas thermal properties were not affected.

25.2.2-R14 DAMAGE EVOLUTION IN THIN AND THICK-PLY REGIONS OF NCF THIN-PLY LAMINATES UNDER OFF-AXIS UNIAXIAL LOADING

G.GUILLAMET, A.TURON (UNIVERSITY OF GIRONA), J.COSTA, J.RENART

An experimental investigation of the evolution of damage using NCF thin-ply laminates is presented. The results show that although the laminates are isotropic in stiffness they are highly anisotropic in strength. Thin-plies delay or even suppress some damage mechanisms.

25.2.3-R8 AUTOMATIC TRANSFORMATION OF 3D MICRO-CT IMAGES INTO FINITE ELEMENT MODELS WITH ANISOTROPIC LOCAL PROPERTIES

I.STRAUMIT (KULEUVEN), SV.LOMOV, F.BENSADOUN, M.WEVERS

The paper presents the results on direct conversion of 3D micro-CT image of textile composite into the finite element model with anisotropic local mechanical properties. The primary direction of anisotropy is determined from the orientation of fibres in the reinforcement.

25.2.3-R9 APPLICATION OF CRITICAL STRESS STATE CRITERION APPROACH TO FLEXURAL STRENGTHENED CONCRETE BEAMS USING FRP SHEETS

H.TOUTANJI (UNIVERSITY OF ALABAMA IN HUNTSVILLE), R.VUDDANDAM

This study focuses on the flexural behavior of FRP strengthened reinforced concrete beams. Experimental and theoretical methods were explored. The analytical results agreed with the experimental data.

25.2.3-R10 MORPHOLOGICAL CHARACTERIZATION OF BENZOXAZINE RESINS USED FOR FST APPLICATIONS IN THE AIRCRAFT INDUSTRY

M.RODRIGUEZ-GUDE (FIDAMC), A.SANCHEZ-BLAZQUEZ, R.AVILA, F.RODRIGUEZ-LENCE

The morphology of two benzoxazine composites has been analyzed using AFM as main experimental technique. These composites have been manufactured using different technologies: autoclave and RTM. The presence of thermoplastic additives in materials formulation originates complex and heterogeneous two-phase morphologies.

25.2.3-R11 CHARACTERISATION OF THE IMPACT BEHAVIOUR OF SHORT GLASS FIBRE REINFORCED POLYPROPYLENE

A.HARTL (JOHANNES KEPLER UNIVERSITY LINZ), M.JERABEK, R.LANG

In the present work, the impact properties of short glass fiber reinforced polypropylene are characterized as a function of loading mode (bending, tensile and puncture), fiber orientation, degree of fiber-matrix coupling and notch radius.

25.2.3-R12 A NEW REDUCED APPROACH TO SIMULATE CURING IN COMPOSITE FORMING PROCESSES

N.BUR, S.AGHIGHI, P.JOYOT (ESTIA RECHERCHE), F.CHINESTA, P.VILLON

We propose an algorithm to solve the curing equation by writing the fields under their separated form. This approach enables having a non-incremental method in time, less expensive than classical approaches.

25.2.3-R13 SOLUTION ON THE HIGH-SPEED RTM TO REDUCE THE IMPREGNATION TIME FOR CARBON/EPOXY COMPOSITES

SH.HAN (CHONBUK NATIONAL UNIVERSITY), HC.LEE, SS.KIM

In this study, composite plate structures were fabricated by using new high-speed RTM process to reduce the impregnation time. The key idea of this method is to change the resin flow direction from in-plane to through-thickness of the preform.

25.2.3-R14 COMBINED MULTI-SCALE SIMULATIONS IN FIBER-REINFORCED COMPOSITES

F.NAYA (IMDEA MATERIALS), C.GONZÁLEZ, C.LOPES, S.VAN DER VEEN, J.LLORCA

A coupled experimental-computational framework has been developed to determine matrix dependent mechanical properties of a fiber-reinforced composite lamina. This methodology includes experimental characterization of matrix and interface, combined with numerical simulations of a Representative Volume Element of the real microstructure.

25.2.4-R8 STIFFNESS AND FRACTURE OF SHEAR LOADED LAMINATES WITH UNIDIRECTIONAL AND BIAXIAL FIBRE ORIENTATION INVESTIGATED WITH A PICTURE FRAME TEST

V.TRAPPE (FEDERAL INSTITUTE FOR MATERIALS RESEARCH AND TESTING), F.GRASSE, R.BASAN

An especially designed “picture frame test” apparatus was developed for the convenient and precise determination of the in-plane shear strength and stiffness of FRPs. Promising results were gained for 0°- and 0°/90°-laminates made of non crimp fabrics.

25.2.4-R9 A NEW ELASTO-PLASTIC MATERIAL MODEL FOR COATED FABRIC IN MEMBRANE STRUCTURES

TD.DINH (DEPARTMENT OF MATERIALS SCIENCE AND ENGINEERING, GHENT UNIVERSITY), A.REZAEI, M.VAN CRAENENBROECK, S.PUYSTIENS, L.DE LAET et al.

This article proposes a elasto-plastic material model for coated fabrics. Based on uniaxial and biaxial tests, an elasto-plastic material model is proposed which incorporates the observed nonlinearities and permanent strains in the constitutive behaviour of these materials.

25.2.4-R12 A PROCESS ESTIMATOR FOR THE RTM PROCESS

B.ECK (ECOLE CENTRALE DE NANTES), S.COMAS-CARDONA, C.BINETRUY, C.AUFRERE

This study presents a FRP part optimization method regarding mass, mechanical properties and manufacturability with the RTM process. The latter is verified with a fast estimation of main process characteristics, using a Process Estimator which considers local material parameters.

25.2.4-R13 EXPERIMENTAL STUDY AIMING TO IDENTIFY OPTIMAL MATERIAL FOR AN AUTOMOTIVE CRASHBOX

D.GUILLON (CETIM), PR.GUEGAN, M.KNEVELLER, C.PRIEM

This study aims to develop a composite crashbox suitable for a 1000 parts/day production at low cost and adapted to current mass market vehicle design. Short term solution with reliable technology, and long term development with innovative processes are proposed.

25.2.4-R14 ELASTIC PROPERTIES AND STRENGTH OF COMPOSITE PLATE REINFORCED BY KNITTED FABRICS

A.KRASNIKOVS (RIGA TECHNICAL UNIVERSITY), O.KONONOVA, A.KHABBAZ, J.VARNA