23.4.1-R1 INFLUENCE OF BEARING DEGRADATION ON THE BEHAVIOUR OF MULTI-BOLT COMPOSITE JOINTS WITH HOLE-LOCATION ERROR

J.LECOMTE (I2M BORDEAUX 1), C.BOIS, H.WARGNIER, JC.WAHL

Two models with different levels of complexity were developed to study the effect of hole-location error on the load distribution in multi-bolt joints, focusing on non-linear behaviour generated by friction phenomena and clearance in bolt-adherent contact and material damage.

23.4.1-R2 AUTOMATED COMPOSITE MANUFACTURING USING OFF-THE-SHELF AUTOMATION EQUIPMENT – A CASE FROM THE SPACE INDUSTRY

A.BJÖRNSSON (LINKÖPING UNIVERSITY), M.THUSWALDNER, K.JOHANSEN

A novel approach to the manufacturing of composite products using off-the-shelf automation equipment is explored. A described manufacturing concept shows the possibility to build a system for the manufacturing of composite products using a high degree of off-the-shelf automation equipment.

23.4.1-R3 EFFECTS OF HEAT TREATMENT AND SINTERING TEMPERATURE ON THE MICROSTRUCTURE OF TIBW/TI60 COMPOSITES WITH A NOVEL NETWORK MICROSTRUCTURE

B.WANG (HARBIN INSTITUTE OF TECHNOLOGY), L.HUANG, BX.LIU, L.GENG

By increasing the sintering temperature, coarse and anisotropic TiB whiskers were in situ synthetized instead of TiB2 particles. The solution treatment could effectively reduce the element segregation formed in the sintering process and improve tensile properties.

23.4.1-R5 DESIGN OF NON-CONVENTIONAL CFRP LAMINATES FOR IMPROVED DAMAGE RESISTANCE AND DAMAGE TOLERANCE

G.GUILLAMET (UNIVERSITY OF GIRONA), Y.LIV, A.TURON, L.MARÍN, EV.GONZÁLEZ et al.

This work presents a new philosophy for the design of non-conventional laminates with improved mechanical performance against impact events. The laminate is designed such that outer plies absorb most of the energy and that the middle plies carry compressive loads.

23.4.1-R6 RECYCLED CARBON-FIBER FLEECES AS A GREEN ALTERNATIVE FOR REINFORCING IN-PLANE MECHANICAL PROPERTIES OF THERMOSET COMPOSITES

A.RIOS DE ANDA (UNIVERSITY OF BAYREUTH), T.NEUMEYER, H.LENGSFELD, T.RADEMACKER, V.ALTSTÄDT

The reinforcement capabilities of recycled carbon fibers were considered in this research. Laminates were obtained by RTM with a rapid-curing two-component epoxy resin as a matrix. The recycled carbon fibers exhibited a good processability. Mechanical in-plane properties were herein investigated.

23.4.1-R7 NON-LINEAR MECHANICAL RESPONSE OF TRIAXIAL BRAIDED COMPOSITES UNDER TENSION

T.WEHRKAMP-RICHTER (INSTITUTE FOR CARBON COMPOSITES, TECHNISCHE UNIVERSITÄT MÜNCHEN, FACULTY OF MECHANICAL ENGINEERING), ST.PINHO, R.HINTERHÖLZL

This work investigates the non-linear mechanical response of triaxial braided composites under multi-axial loading. Specimens were subjected to incremental tensile load cycles up to final failure, which allows characterizing the evolution of plastic strain and damage within the material.

23.4.2-R1 ASSESSMENT OF DELAMINATION CRACK GROWTH RATE OF CO-CURED STEPPED LAP JOINTS IN COMPOSITE MATERIALS

M.QUARESIMIN, M.RICOTTA (UNIVERSITY OF PADOVA), M.FERRARI

The fatigue behavior of co-cured stepped-lap joints is discussed in terms of Strain Energy Release Rate. Although the propagation phase is under mixed mode loading, it can be summarised by considering only the range of the mode I SERR.

23.4.2-R2 FRONTCOMP FOR STRENGTH EVALUATION OF CARBON FIBER REINFORCED PLASTIC

N.YOSHIKAWA (THE UNIVERSITY OF TOKYO), K.HARIYA, T.OGASAWARA, SW.KIM

A simulation system, named FrontCOMP, has been developed for a reasonable strength evaluation of carbon fiber reinforced plastic (CFRP) members on the basis of meso-scale model. The validity of system is exemplified through analyses of high pressure vessel.

23.4.2-R3 EFFECT OF NANOFILLER GEOMETRY ON THE POLYMER PHYSICAL STRUCTURE AND MECHANICAL PROPERTIES OF NANOCRYSTALLINE FE-NI ALLOY/POLYAMIDE 6 COMPOSITES

M.MOHAMED (INST. OF ADVANCED TECHNOLOGY & NEW MATERIALS, CITY OF SCIENTIFIC RESEARCH & TECHNOLOGY APPLICATIONS), D.PEDRAZZOLI, N.NADY, K.KALAITZIDOU

This study reports the preparation of polyamide 6 nanocomposites based on nanocrystalline Fe20Ni80 alloy with different geometries, spherical-sea urchin particles and necklace chains. The tensile properties and physical structure were characterized. The nanocomposites' characteristics are considerably affected by filler geometry.

23.4.2-R5 EFFECT OF PROCESS PARAMETERS ON DAMAGE TOLERANCE OF CARBON-EPOXY LAMINATE PREFORMED USING ONE-SIDED STITCHING

C.LEDUC (ÉCOLE DE TECHNOLOGIE SUPÉRIEURE), S.JONCAS, JS.LECLERC

Damage tolerance of vacuum-infused quasi-isotropic carbon-epoxy laminates made from one-sided stitched (OSS®) preforms using different process parameters (i.e. stitching pitch, molding strategy and stitching orientation) were benchmarked using open-hole compression (OHC) and compression after impact (CAI) standard tests.

23.4.2-R6 OPPORTUNITIES OF ACHIEVING PERFORMANCE COMPOSITE PARTS WITH RECYCLED CARBON FIBRES

A.GILLET, O.MANTAUX (I2M UNIVERSITY OF BORDEAUX), P.POMIERS

The realignment of recycled carbon fibres allows to use them for structural applications. The optimization of the weight/resistance ratio is easier than with conventionnal fabrics. we show the benefits of realigned staples fibres on composite plates and on a product.

23.4.2-R7 MACHINE CONFIGURATOR FOR BRAIDED COMPOSITE PROFILES WITH ARBITRARY CROSS SECTION

Y.KYOSEV (HOCHSCHULE NIEDERRHEIN - UNIVERSITY OF APPLIED SCIENCES, MOENCHEN- GLADBACH, GERMANY)

This paper discusses some algorithmic and technological issues, connected with the development of software for building maypole braiding machines for production of profiles with arbitrary cross section. The carrier motion can be used as well for braiding process simulation.

23.4.3-R1 VIBRATION WELDING OF CARBON NANOTUBE REINFORCED POLYOXYMETHYLENE: MORPHOLOGY AND MECHANICAL PROPERTY

L.LIN (COMPOSITE ENGINEERING, UNIVERSITY KAISERSLAUTERN), AK.SCHLARB

Carbon nanotube filled polyoxymethylene was butt-welded using vibration welding technique. The weld strength of the composites was observed to be not significantly impacted by the weld pressures and filler loadings. High weld quality was obtained compared to nanoparticle filled thermoplastics.

23.4.3-R2 LARGE SCALE MANUFACTURING OF LIGHTWEIGHT 3D MULTIFUNCTIONAL COMPOSITES

A.ALMANSA (XEDERA E.U.), S.MENEGAZZI, W.VAN PAEPEGEM, L.BATEUP, E.KNY

In the 3D-LightTrans project, fabrics made of hybrid yarn are formed to pre-fixed deep draped multilayered and 3D-shaped pre-forms, and processed into the final composite part by an efficient thermoforming process. This paper presents the main results achieved so far.

23.4.3-R3 VALIDATION OF THE ONERA DAMAGE MODEL THROUGH COMPARISONS WITH MULTI-INSTRUMENTED STRUCTURAL TESTS ON INTERLOCK WOVEN CERAMIC MATRIX COMPOSITES

F.LAURIN (ONERA, THE FRENCH AEROSPACE LAB), N.TABLEAU, M.KAMINSKI, Z.ABOURA, F.BOUILLON

This paper presents the Onera damage model adapted to predict damage and failure mechanisms encountered in a new generation of interlock woven composite with ceramic matrix. The predictions of this approach are compared successfully with different multi-instrumented tests.

23.4.3-R5 MODELLING PERMANENT INDENTATION IN COMPOSITE SUBJECTED TO IMPACT: IDENTIFICATION THROUGH A SPECIFIC THREE-POINT BENDING TEST

H.NATTHAWAT, S.RIVALLANT (ICA (INSTITUT CLÉMENT ADER)), C.BOUVET

This study presents a three-point bending test specifically designed to identify the behavior of matrix cracks involved in the formation of permanent indentation during low velocity impact on laminated plates. This law is then applied in a finite element model.

23.4.3-R6 STUDY OF MECHANICAL PROPERTIES OF SHORT FIBER GLASS REINFORCED PA 6.6 RECYCLED REPEATEDLY

S.DIEGO (UNIVERSITY OF CANTABRIA), I.CARRASCAL, JA.CASADO, C.THOMAS

This work aims to determine the recycling degree of short fiberglass reinforced polyamide 6.6, which is rejected in quality controls or broken in railway track, maintaining the mechanical properties suitable for the service conditions through a physic-mechanical characterization.

23.4.3-R7 X-RAY ANALYSIS OF SHEARED TEXTILE COMPOSITE REINFORCEMENT

M.BARBURSKI (KU LEUVEN), X.ZHANG, I.STRAUMIT, SV.LOMOV

Simple shear is an interesting deformation mechanism for woven fabric for example during covering the mould. Change of yarns parameters during shear of a carbon fibre twill fabric is quantified and obtained from micro-CT scanning and image processing procedures.

23.4.4-R1 VALIDATION OF A NEW NANO-MODIFIED ADHESIVE JOINING TECHNOLOGY TRIGGERED BY ELECTROMAGNETIC FIELD, BY TESTING OF A REAL COMPONENT.

E.VERNA (POLITECNICO DI TORINO), EG.KORICHO, G.SPEZZATI, G.BELINGARDI, B.MARTORANA et al.

This work has been focused on joining technology for the automotive industry. Nanoparticles have been embedded into a hot-melt adhesive matrix to ensure both the enhancement of polymerization while joining of the components and to allow disassembling of those components.

23.4.4-R2 ELECTRICAL RESISTANCE HEATING – A METHOD FOR BINDER ACTIVATION IN CFRP PROCESSING?

Y.GROHMANN (GERMAN AEROSPACE CENTER (DLR)), F.ZACHARIAS, F.KRUSE, M.WIEDEMANN

A new binder activation method for dry carbon fiber materials is developed. Similar to spot welding, a small compacted area of a preform can be heated up in milliseconds. The main process parameter, the resistivity in through-thickness direction, is investigated.

23.4.4-R3 DEPENDENCE OF CRACK PROPAGATION / DEFLECTION MECHANISM ON CHARACTERISTICS OF FIBER COATING OR INTERPHASE IN CERAMICS MATRIX CONTINUOUS FIBER REINFORCED COMPOSITES

M.BRAGINSKY (AIR FORCE RESEARCH LABORATORY), C.PRZYBYLA

Here the extended finite element method (XFEM) is employed to account for variations in interphase thickness and strength relative to the fibers/matrix and predicted that such variation can have a significant influence on the mechanism of crack propagation/deflection.

23.4.4-R5 A J INTEGRAL BASED METHOD TO MEASURE FRACTURE RESISTANCE AND COHESIVE LAWS IN MATERIALS EXHIBITING LARGE SCALE PLASTICITY

BF.SØRENSEN (TECHNICAL UNIVERSITY OF DENMARK), S.GOUTIANOS

23.4.4-R7 PREDICTION OF DAMAGE DUE TO COMPACTION DURING MANUFACTURING OF TEXTILE COMPOSITES

P.PRABHAKAR (UNIVERSITY OF TEXAS), MS.ISLAM, H.KRIEGER, S.STAPLETON, T.GRIES

The influence of fiber tows on the deformation and damage evolution in fiber reinforced composites is investigated by considering a micromechanical model of fibers within matrix that is undergoing compaction and subsequently subjected to mechanical loads.