23.2.1-R1 BIOMIMETIC-INSPIRED COMPOSITE TO METAL SINGLE LAP JOINTS

EI.AVGOULAS (UNIVERSITY OF CAMBRIDGE), M.SUTCLIFFE

Several biomimetic-inspired metal-to-composite (steel-to-CFRP), adhesively bonded, Single Lap Joints (SLJs) were numerically investigated using a finite element analysis. The proposed solutions offer a transitional zone of stiffness of one joint part to reduce the material stiffness mismatch at the joint.

23.2.1-R2 COMPARATIVE PARAMETRIC MODELLING OF COMPOSITE TUBES AND COMPOSITE OVERWRAPPED PRESSURE VESSELS

H.JUNIOR, H.FARIA, A.TORRES MARQUES (UNIVERSITY OF PORTO), S.AMICO

Stress and strain levels of COPV and composite tube were evaluated, through FEM. The parametric modelling were made by three new concepts, liner stress/strain share fraction and thickness ratio. Composite tube can parametrically represent COPV at lower pressures.

23.2.1-R3 SPARK PLASMA SINTERING TECHNOLOGY APPLIED TO POLYMER/METAL COMPOSITES FOR STRUCTURAL LIGHT WEIGHTING

M.SCHWERTZ (FRENCH-GERMAN INSTITUTE OF SAINT-LOUIS), S.LEMONNIER, E.BARRAUD, A.CARRADÒ, MF.VALLAT et al.

This work deals with the development of polymer/metal assembly for structural applications, using the spark plasma sintering (SPS) technique. Firstly, the optimisation of polyimide consolidation by SPS was done. Secondly, multilayered polyimide/aluminium composites were consolidated by SPS and characterised.

23.2.1-R4 CORE-SHELL RUBBER NANOPARTICLE TOUGHENED CARBON FIBRE/EPOXY COMPOSITES

D.ROY (UNIVERSITY OF LIMERICK), A.COMER, I.ROSCA, W.OBANDE, G.CLANCY et al.

Core-shell rubber nanoparticles (CSR) introduced into a carbon fibre/epoxy composite increased the residual compressive strength values between 6-26% with the incorporation of 1 to 3 weight% of CSR. The glass transition temperature remained unchanged up to 3% loading of CSR.

23.2.1-R5 A NEW UNDERSTANDING OF DAMAGE MECHANISM OF CAI

Y.YANG (NOTTINGHAM UNIVERSITY), S.LI

The numerical model simulates two damage modes simultaneously: laminar in-plane failure and interfacial delamination propagation. The results obtained show that, bearing multi-delamination resulting from low-speed impact, the dominant damage mechanism of CAI is in-plane failure.

23.2.1-R6 REGENERATION OF THERMALLY RECYCLED GLASS FIBRE FOR COST-EFFECTIVE COMPOSITE RECYCLING: PERFORMANCE OF FIBRE RECYCLATES FROM THERMOSET COMPOSITES AND WITH SUBSEQUENT RECOVER TREATMENTS

CC.KAO (UNIVERSITY OF STRATHCLYDE), JL.THOMASON

This study reported strength regeneration of glass fibres thermally recycled from polyester composites using ReCoVeR treatments. Since thermal residues were observed on the fibre surface the results of additional washing step in the treatment were also presented.

23.2.1-R7 HYPERELASTIC MODEL FOR FORMING SIMULATIONS OF A NON-CRIMP 3D ORTHOGONAL WEAVE E-GLASS COMPOSITE REINFORCEMENT

J.PAZMINO, S.MATHIEU, V.CARVELLI (POLITECNICO DI MILANO), P.BOISSE, SV.LOMOV

An hyperelastic constitutive model is improved to investigate formability of a single layer E-glass non-crimp 3D orthogonal woven reinforcement. Experimental and numerical simulations demonstrated the adequacy of the model predicting the behaviour of the 3D reinforcement during 3D shapes forming.

23.2.2-R1 IN-PLANE THERMAL RESIDUAL STRESSES IN ADHESIVELY BONDED FUNCTIONALLY GRADED PLATES

MK.APALAK (ERCIYES UNIVERSITY), MD.DEMIRBAS

This study addresses the effect of the coordinate derivatives of material properties on the thermal stress and strain states in adhesively bonded functionally graded joints. The material derivatives indicate lower stress and strains, different strain but similar stress distributions.

23.2.2-R2 ESTIMATION OF THE RESIDUAL STRESS STATE GENERATED DURING THE CURING OF A THICK EPOXY MATRIX BY PULSED LASER

C.JOCHUM (ENSTA BRETAGNE, FRANCE), M.ARRIGONI, M.BOUSTIE, JC.GRANDIDIER

The pulsed laser shock approach is presented to assess internal stress level of epoxy matrix after the curing. The cut-off fracture technique, based on the maximal tensile stress is used for shock simulation results analysis, thanks to epoxy failure criteria.

23.2.2-R3 PROCESSING AND CHARACTERIZATION OF B4C-SIC/(AL,SI) MULTI-CARBIDES COMPOSITES

B.ARAÚJO DE ALMEIDA (UNIVERSITY OF AVEIRO), A.RAVANAN, MC.FERRO, P.GRAVE, H.WU et al.

Dense B4C-SiC/(Al, Si) composites prepared by short time reactive melt infiltration were characterized by XRD, SEM/EDS and EBSD. HV and KIC were evaluated, the role of interfaces and brittle/ ductile phases in toughening being further assessed by using EBSD.

23.2.2-R4 PREPARATION OF WELL-ALIGNED AND WELL-ORIENTED ALL-POLYIMIDE NANOFIBER COMPOSITE

K.MIZOGUCHI (KOBE UNIVERSITY), C.HONGO, M.KOTERA, T.NISHINO

A simple method for preparing all-polyimide (PI) nanocomposite was proposed. Well-aligned and well-oriented PI nanofibers were electrospun with rotating disk-shaped collector, then these nanofibers were impregnated into PI precursor solution, followed by imidization, which results in high modulus composites.

23.2.2-R5 THE ROLE OF PARTICLE-TOUGHENING IN IMPROVING POST-IMPACT COMPRESSIVE STRENGTH

D.BULL (UNIVERSITY OF SOUTHAMPTON), SM.SPEARING, I.SINCLAIR

The role of particles towards impact damage resistance and compression-after-impact damage tolerance has been studied through extensive use of 3D X-ray computed tomography. Four particle toughened systems were compared through qualitative and quantitative methods to identify the key toughening mechanisms.

23.2.2-R6 REGENERATION OF THERMALLY RECYCLED GLASS FIBRE FOR COST-EFFECTIVE COMPOSITE RECYCLING: PERFORMANCE OF COMPOSITES BASED ON PP AND RECOVERED GLASS FIBRE

U.NAGEL (STRATHCLYDE UNIVERSITY), E.SÁEZ RODRIGUEZ, JL.THOMASON, CC.KAO

This study demonstrates that composites based on thermally recycled glass fibres have the potential to compete with composites based on ‘new’ glass fibres. The regeneration of glass fibres led to a significant improvement of composite properties.

23.2.2-R7 MATERIAL MODELS FOR DRAPING SIMULATION OF CARBON FIBRE FABRIC WITH PROCESS-INDUCED VARIANCES OF SHEAR RIGIDITY AND CONTACT PARAMETERS

T.GEREKE (TECHNISCHE UNIVERSITÄT DRESDEN), FN.NEZAMI, O.DÖBRICH, M.HÜBNER, C.CHERIF

A simulation tool that is able to predict the fibre orientation and defects in textile composite reinforcements is presented. A previously developed macroscopic model for the simulation of textile draping is further improved by incorporating coupled shear and tension behaviour.

23.2.3-R1 MODELING THE PROGRESSIVE DAMAGE OF ADHESIVELY BONDED JOINTS

A.VASSILOPOULOS (ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)), R.SARFARAZ, M.SHAHVERDI, T.KELLER

A progressive damage model was developed based on a mixed-mode fracture failure criterion, experimentally developed using data acquired under pure Modes of fracture. It was successfully employed for predicting the strength and the R-curve response of structural joints.

23.2.3-R2 EFFECT OF MANUFACTURING PROCESS INDUCED FIBER WAVINESS ON MECHANICAL PROPERTIES OF COMPOSITE STRUCTURES BY EXAMPLE OF A PREPREG FORMING PROCESS

K.ENGEL (TECHNISCHE UNIVERSITÄT BRAUNSCHWEIG), P.HORST, T.HUNDT, C.SCHMIDT, B.DENKENA

An approach to include effects of a forming process on preimpregnated fibers into the design of composite structures by analysis of the resulting fiber waviness is presented. Fiber angle distributions are analyzed and first ply failure is predicted.

23.2.3-R3 MECHANICAL PROPERTIES OF TIB2-NIAL COMPOSITE MATERIALS FABRICATED BY SPARC PLASMA SINTERING

M.YOSHIDA (UBE NATIONAL COLLEGE OF TECHNOLOGY)

Titanium diboride added with NiAl has been sintered using spark plasma sintering. The highest Vickers hardness of 1600Hv has been obtained for TiB2-40wt%NiAl and the highest bending strength of 990MPa has been obtained for TiB2-80wt%NiAl.

23.2.3-R4 ELECTRIC CURING OF NANOCARBON/EPOXY ADHESIVES FOR COMPOSITE REPAIR

A.MONREAL BERNAL (IMDEA MATERIALES), B.MAS, JP.FERNÁNDEZ-BLÁZQUEZ, JJ.VILATELA

This work shows results on the addition of conducting nanoparticles (e.g. CNTs, GO) to epoxy resins to obtain electrically-curable adhesives for composite repair and bonding. The thermomechanical properties of the joint are also analyzed.

23.2.3-R5 DAMAGE TOLERANCE OF COMPRESSED GASEOUS HYDROGEN COMPOSITES VESSELS

C.DEVILLIERS, M.WEBER (AIR LIQUIDE), N.GUILLAUD, F.DAU, B.GENTILLEAU et al.

The present study is part of a project funded by the French National Research Agency, called Toledo. It is dedicated to the study of the effect of mechanical impacts on wound carbon fiber composite pressure vessels performance.

23.2.3-R6 A COMPARATIVE STUDY INTO MECHANICAL PERFORMANCE OF GLASS FIBRES RECOVERED THROUGH MECHANICAL GRINDING AND HIGH VOLTAGE PULSE POWER FRAGMENTATION

D.ROUHOLAMIN (UNIVERSITY OF EXETER), YT.SHYNG, L.SAVAGE, O.GHITA

The authors are involved in developing new routes to the recycling and remanufacturing of heterogeneous composite materials, and providing solutions to the current issues in the recycling processes of composite materials.

23.2.3-R7 EXPERIMENTAL FORMING STUDIES ON 3D WARP INTERLOCK FABRICS

C.DUFOUR (UNI. LILLE, ENSAIT), F.BOUSSU, P.WANG, D.SOULAT

To highlight the influence of the 3D warp interlock structures on their forming behaviour, two structures have been woven and formed with a complex shape of punch. Different characteristics have been measured to understand their forming behaviour and compare them.

23.2.4-R1 INVESTIGATION ON THE FAILURE MECHANISMS OF COMPOSITE FASTENERS WITH COUNTERSUNK HEAD IN FATIGUE LOADING

M.SCHUETT (HAMBURG UNIVERSITY OF TECHNOLOGY), H.WITTICH, F.NUSSBAEUMER, K.SCHULTE, B.FIEDLER

This experimental study presents a detailed study on the failure mechanisms of a CFRP single-lap shear joint under cyclic loading conditions. At which the joint consists of two laminate plates and two CFRP fasteners with countersunk heads.

23.2.4-R2 THERMO-MECHANICAL PROCESS MODELLING OF INDUSTRIALLY PULTRUDED PARTS HAVING UD AND CFM LAYERS

I.BARAN (TECHNICAL UNIVERSITY OF DENMARK), J.HATTEL, R.AKKERMAN

The process induced stresses and shape distortions are predicted for an industrial pultruded rectangular hollow profile using a thermo-chemical-mechanical model developed by authors. Predicted warpage is found to agree quite well with the one measured in a commercial pultrusion company.

23.2.4-R3 RESEARCH OF HIGH-TEMPERATURE COMPRESSION PROPERTY OF TI2ALN/TIAL COMPOSITES

Q.WANG (HARBIN INSTITUTE OF TECHNOLOGY), T.SUN, Q.TIAN, J.WANG, DL.SUN et al.

23.2.4-R4 EXPERIMENTAL CREEP ANALYSIS OF BIODEGRADABLE POLYMER MATRIX NANOCOMPOSITES FOR ACL REPLACEMENT

V.PINTO (UNIVERSITY OF PORTO, PORTUGAL), J.XAVIER, R.MIRANDA GUEDES

Concerning to PLA viscoelastic behaviour influence on medical device failure, it is presented a experimental creep mechanical study of PLA-matrix nanocomposites reinforced with carboxyl functionalized carbon nanotubes, showing permanent strain reduction accumulated on these nanocomposites comparing to PLA.

23.2.4-R5 EXPERIMENTAL STUDY OF IMPACT DAMAGE RESISTANCE AND TOLERANCE OF E-GLASS/EPOXY SKINNED SANDWICH PANELS

P.NASH (LOUGHBOROUGH UNIVERSITY), G.ZHOU, S.GAHLAY

An experimental study of in-plane compressive behaviour of E-glass/epoxy-skinned sandwich panels was conducted. Two cross ply E-glass/epoxy skin thickness combinations were impact-damaged with dominant damage mechanisms being characterised. The effects of impact damage, skin thickness, on CAI strength were examined

23.2.4-R6 REGENERATION OF THERMALLY RECYCLED GLASS FIBRE FOR COST-EFFECTIVE COMPOSITE RECYCLING: IMPROVING THEMAL RECOVERY OF FIBRES FROM GRP

DP.RAGHAVALU THIRUMALAI (UNIVERSITY OF STRATHCLYDE,), JL.THOMASON, L.YANG,, CC.KAO, P.JENKINS

23.2.4-R7 DEVELOPMENT OF THE 3D MULTIAXIS WEAVING TECHNOLOGY AND GEOMETRICAL CHARACTERIZATION OF THE PRODUCED PERFORMS

AR.LABANIEH (UNIVERSITY OF LILLE 1), X.LEGRAND, V.KONCAR, D.SOULAT

Novel technique to produce 3D multiaxis woven preform has been developed. Geometric characterization for the produced samples have been carried out based on analyzing the captured micrographs for their cross section. These acquired data serve in construction of geometric model.