25.4.1-R8 LARGE DAMAGE RESIDUAL STRENGTH ANALYSIS: SIMULATIONS AND TESTS

M.REMACHA (FIDAMC: FOUNDATION FOR THE RESEARCH, DEVELOPMENT AND APPLICATION OF COMPOSITE MATERIALS), E.MARTINO

The behaviour of a composite structure with huge damages produced by blade impact is analysed. Detailed simulations and tensile tests of damaged curved stiffened panels have been carried out getting an adequate correlation. Finally, a fuselage architecture has been validated.

25.4.1-R9 MATRIX YIELDING ENERGY CONTRIBUTION TO FRACTURE TOUGHNESS OF PARTICLE REINFORCED COMPOSITES

B.LAUKE (LEIBNIZ-INSTITUT FÜR POLYMERFORSCHUNG DRESDEN E.V.)

Fracture toughness is modeled on the basis of calculating matrix yielding energy around debonded particles. Integration of local yielding energy density over the stress field of a crack provides a maximum of toughness with increasing particle content as in experiments.

25.4.1-R10 STRUCTURAL INTEGRITY IN FIRE: AN INTERMEDIATE-SCALE APPROACH ON PLAIN AND SHELL-STRUCTURED COMPOSITES

S.TIMME (BAM FEDERAL INSTITUTE FOR MATERIALS RESEARCH AND TESTING), A.HÖROLD, B.SCHARTEL, V.TRAPPE, M.KORZEN

Investigation of fire stability and fire resistance of carbon fiber reinforced polymer airframe structures with boundary conditions of an aeronautical post-crash fire. Therefore fire tests are performed where the specimen is compressed and exposed to fire at the same time.

25.4.1-R11 EFFECT OF HYDROLYSIS ON FRACTURE PROPERTIES OF HYBRID INTERFACE CONTROL IN HAP/PLA COMPOSITES

M.TANAKA (KANAZAWA INSTITUTE OF TECHNOLOGY), T.TAKAHASHI, I.KIMPARA

We evaluated the effect of hydrolysis on fracture properties in the hybrid-interface-controlled HAp/PLA. The optimum design of interface-control efficiency and the introduction of acceleration sites in PLA molecular chain could realize HAp/PLA composites with excellent fracture and hydrolysis properties.

25.4.1-R12 THERMOPLASTIC COMPOSITE STRUCTURES FOR SPACE APPLICATIONS: MANUFACTURING PROCESS SIMULATION

P.PERES (AIRBUS DEFENCE & SPACE), JM.DUPILLIER, B.DEFOORT

Senior expert in materials & processes mainly in composite materials, organic and ceramic from the process to the mechanical behavior.

25.4.1-R13 STAMP FORMING OF THERMOPLASTIC COMPOSITES: EFFECT OF RADIUS AND THICKNESS ON PART QUALITY

T.JAMIN, M.DUBÉ (ECOLE DE TECHNOLOGIE SUPERIEURE), LL.LEBEL

25.4.1-R14 MICRO-MECHANISTIC ANALYSIS OF IN SITU CRACK GROWTH IN TOUGHENED CARBON/EPOXY LAMINATES TO DEVELOP MICROMECHANICAL FRACTURE MODELS

G.BORSTNAR (UNIVERISTY OF SOUTHAMPTON), M.MAVROGORDATO, I.SINCLAIR, SM.SPEARING

Crack growth through particle-toughened CFRPs has been captured using Computed Tomography and Laminography. Interrupted crack growth experiments permitted the chronological identification of damage evolution, with respect to local microstructure, non-destructively and at a representative stress state.

25.4.2-R8 MOST INNOVATIVE CFRP SOLUTIONS FOR A350XWB RFE S19 AIRFRAME: CO-CURED SHELL & INTEGRATED RTM DOOR-FRAME

J.SÁNCHEZ (AIRBUS OPERATIONS SL), R.AVILA, M.HUERTAS, JC.GOMEZ, JM.BLANCO et al.

A350XWB features brand new 30 integrated cocured shell (6m long 5 m diameter) as well as integrated coinjected access RTM door frame; both including end to end concurring tasks on material development, design & stress, manufacturing process, etc, till full industrialized soutions for high production rates. Both S19 360º shell and integral RTM frame are smmit of A350 dedicated development plan, as wellas concerned R&D projects (and Airbus previous experience on ATL/AFP cocured and cobonded panel

25.4.2-R9 HIERARCHICAL MULTISCALE MODELING ON POLYMER NANOCOMPOSITES CONSIDERING HYPERELASTIC BEHAVIOR

M.CHO (SEOUL NATIONAL UNIVERSITY), H.SHIN, W.KIM, S.YANG, S.YU et al.

A hierarchical multiscale modeling approach to characterize the hyperelasitc behavior of polymer nanocomposites is proposed. In multiscale simulation, molecular dynamics simulation and continuum-based homogenization are employed. Stress-strain relationship of interphase shows Mooney-Rivlin hyperelastic behavior.

25.4.2-R10 PYROLYSIS MODELING OF POLYMER COMPOSITES FOR FIRE SIMULATIONS

A.MATALA (VTT TECHNICAL RESEARCH CENTRE OF FINLAND), S.HOSTIKKA

Fire safety of polymer composites can be evaluated by coupled simulations of the gas-phase fire phenomena and solid pyrolysis. The process and the methods of pyrolysis modelling are demonstrated using experimental results of carbon fibre-epoxy composite as a basis.

25.4.2-R11 BIOMECHANICAL INVESTIGATION OF A NEW HYBRID COMPOSITE MATERIAL FOR USE IN INTRAMEDULLARY NAILING IN FEMORAL SHAFT FRACTURES

H.BOUGHERARA (RYERSON UNIVERSITY), P.TAVAKKOLI AVVAL, Z.FAWAZ, S.SAMIEZADEH

This study demonstrates that the proposed hybrid composite fixation device can provide a preferred mechanical environment for healing in femoral shaft fractures by increasing the average normal force at the fracture site.

25.4.2-R12 MONOLITHIC APPROACH OF STOKES-DARCY COUPLING FOR RESIN INFUSION BASED PROCESS MODELLING

L.ABOU ORM, M.BLAIS, N.MOULIN (ECOLE DES MINES DE SAINT-ETIENNE), J.BRUCHON, S.DRAPIER

A robust numerical method for simulating Liquid Resin Infusion processes is presented. A mixed velocity-pressure variational formulation is established for the fully Stokes-Darcy coupled problem and discretized using finite element method stabilized with a sub-grid scale stabilization technique (ASGS).

25.4.2-R13 OPTIMIZING THE PRODUCTION AND PROCESSING OF FIBRE REINFORCED THERMOPLASTIC PRE IMPREGNATED MATERIALS

PJ.NOVO (SCHOOL OF TECH. AND MANAGEMENT, POLYTECHNIC INSTITUTE OF LEIRIA), JF.SILVA, JP.NUNES, A.TORRES MARQUES

The aim of this work is to optimize the production of new continuous carbon fibres reinforced polypropylene matrix pre-impregnated materials (towpregs) continuously processed by dry deposition of polypropylene powder. The processing of the produced towpregs by pultrusion was also optimized.

25.4.2-R14 INITIATION AND EVOLUTION OF CRACKS IN A CHOPPED GLASS-REINFORCED COMPOSITE UNDER BIAXIAL TESTING BY MEANS OF XFEM

MC.SERNA (UNIVERSIDAD DE CASTILLA-LA MANCHA), JL.CURIEL, J.NAVARRO

The eXtended Finite Element Method (XFEM) provides an effective engineering approach for modelling discontinuities in solids. Here the XFEM is applied to simulate the initiation and propagation of cracks in a chopped glass-reinforced composite submitted to biaxial loading.

25.4.3-R8 DISTRIBUTED LOADS DISCRETIZATION IN COMPOSITE MATERIALS STRUCTURES TESTS

C.ARELLANO (TEAMS S.L.), S.OSUNA, J.CAÑAS

Development of a tool for the calculus of discrete loads which allows the reproduction of distributed loads in composite structures tests.

25.4.3-R9 A NEW MULTI-PHYSICS MOLECULAR DYNAMICS FINITE ELEMENT METHOD FOR DESIGNING GRAPHENE COMPOSITE NANO-STRUCTURES TO TARGET PROPERTY SPECIFICATIONS

AR.WILMES (IMPERIAL COLLEGE LONDON), ST.PINHO

A new Molecular Dynamics Finite Element Method, embedding advanced mechanical and multi-physics charge-dipole force fields exactly in FEM is proposed. Novel results including homogenised in-plane and bending properties of Pillared Graphene Structures and the fracture toughness of graphene are presented.

25.4.3-R10 INTUMESCENT COATINGS FOR PROTECTION OF COMPOSITES FOR AIRCRAFT APPLICATION

P.VOLLARO (IMAST), E.MILELLA, M.MARTONE, A.FINA, G.CAMINO

The substitution of metal with fiber composite structures in aircraft applications delivers new challenges in terms of fire resistance. Intumescent coatings alone or modified by nano-fillers were applied on carbon fibre-reinforced composites and the thermal protection behavior has been discussed.

25.4.3-R11 MECHANICAL, THERMAL, AND TOXICOLOGICAL EVALUATION OF POROUS NANOCOMPOSITES PROJECTED FOR BONE GRAFTING

S.EFTEKHARI (RYERSON UNIVERSITY), I.EL SAWI, G.TURCOTTE, H.BOUGHERARA

Cellulose/hydroxyapatite/PLLA nanocomposites were fabricated projected for bone grafting and their morphological, thermal, mechanical properties evaluated. Crystallinity of the nanocomposites increased from 10% to 38%, yield to improving of compressive strength up to 90%. Toxicological assessments demonstrated excellent bioactivity results.

25.4.3-R12 NUMERICAL INVESTIGATION OF FLOW OF GENERALIZED NEWTONIAN FLUIDS IN DOUBLE-SCALE POROSITY COMPOSITE REINFORCEMENTS

E.SYERKO (ECOLE CENTRALE DE NANTES), C.BINETRUY, A.LEYGUE, S.COMAS-CARDONA, A.TRAMEÇON

High resolution solutions of non-Newtonian resin flow through double-scale porosity textile reinforcements are obtained by Proper Generalized Decomposition at reduced numerical cost. Conditions for neglecting non-Newtonian effects at micro-scale, and applicability of Brinkman equation to modelling non-Newtonian flows are discussed.

25.4.3-R13 NEW GMT MATERIAL SUITABLE FOR VARIOUS POLYMERS AND HIGH GLASS FIBER CONTENT

G.JUNG (INSTITUT FÜR VERBUNDWERKSTOFFE GMBH), P.MITSCHANG, C.PARK

A new GMT-like material is introduced having the concept of a multi-layered hybrid structure, which is suitable for various polymers (PP and PA) and high GF content (up to 70 wt. %). Overcome the limit of conventional GMT material.

25.4.3-R14 EFFECT OF NEIGHBORING FIBERS ON ENERGY RELEASE RATE DURING FIBER/MATRIX DEBOND GROWTH

L.ZHUANG, A.PUPURS (LULEA UNIVERSITY OF TECHNOLOGY)

In this paper fiber/matrix debond growth in unidirectional composites subjected to mechanical tensile loading is analyzed using fracture mechanics principles of energy release rate (ERR). The objective is to analyze the effect of neighboring fibers on the ERR.

25.4.4-R9 DAMAGE MECHANISMS OF NANOPARTICLE-MODIFIED CFRP UNDER VERY HIGH CYCLE FATIGUE-LOADING

JB.KNOLL (HAMBURG UNIVERSITY OF TECHNOLOGY), I.KOCH, K.SCHULTE, M.GUDE, B.FIEDLER

In this work the damage mechanisms of carbon nanoparticle (CNT and graphene) modified CFRP under fatigue loading are investigated. An improvement of fatigue life and change in dominating damage mechanism due to the nanoparticle modification were revealed.

25.4.4-R10 THERMAL DIFFUSIVITY MEASUREMENTS ON FIBRE REINFORCED POLYMER THROUGH THE STEP CHANGE TECHNIQUE

P.DI MODICA (NEWCASTLE UNIVERSITY), P.VOLLARO, AG.GIBSON

Composites Thermal diffusivity has been measured through a step change technique. The technique is capable of measuring thermal diffusivity without the need of knowing or estimating the heat capacity. Results until 100°C for unidirectional CFRP and 0/90 GFRP are presented.

25.4.4-R13 EVALUATION OF PROCESS INDUCED RESIDUAL STRESSES IN CONTINUOUS FIBER-REINFORCED HYBRID THERMOPLASTIC COMPOSITES

H.PAUL (FRAUNHOFER IWM), F.SCHWEIZER, B.HANGS

The mechanical behavior of hybrid thermoplastic composites can be influenced by residual stresses. Studies for the evaluation of deformation and residual stresses are presented. The studies include measurement of the deformation, bending tests, residual stress measurements and finite element simulations.

25.4.4-R14 MICROMECHANICAL SIMULATION OF FRACTURE IN POLYMER MATRIX COMPOSITE LAMINATE PLIES

T.BREITZMAN (U.S. AIR FORCE RESEARCH LABORATORY), D.MOLLENHAUER, E.IARVE, K.HOOS, E.ZHOU

Fracture properties are explored by calculating a minimal energy fracture surface. Simulations are performed using the regularized XFEM with the minimal energy surface. The resulting properties are compared to results of simulations using different crack paths within the microstructure.