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FAILURE BEHAVIOUR OF TRIAXIAL BRAIDED COMPOSITES

Tobias Wehrkamp-Richter (Technical University of Munich / Institute for Carbon Composites) Silvestre Pinho (Imperial College London) Roland Hinterhölzl (Technical University of Munich / Institute for Carbon Composites)

 

The non-linear mechanical response of triaxial braided composites is predicted using meso-scale finite element unit cells.

 

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THREE-DIMENSIONAL TEXTILE STRUCTURAL COMPOSITES WITH NEGATIVE POISSON’S RATIO

Lili Jiang (Hong Kong Polytechnic University) Lin Zhou (Hong Kong Polytechnic University) Kun Xu (Chinese Academy of Sciences) Hong Hu (Hong Kong Polytechnic University)

 

Two types of 3D auxetic textile structural composites were developed. They show different compressive properties and Poisson's ratio due to the difference of reinforcement structures. Composite B is better suitable for using as protection materials.

 

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VIRTUAL DESIGN OF TEXTILE COMPOSITES STARTS ON A FILAMENT LEVEL

Oliver Döbrich (Technical University of Dresden) Thomas Gereke (Technical University of Dresden) Chokri Cherif (Technical University of Dresden)

 

The paper introduces possibilites of virtual composite design on a micro-scale level.

 

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WARP AND WEFT DIRECTION DAMAGE DEVELOPMENT IN THE LATE-STAGE FATIGUE LIFE OF A 3D NON-CRIMP ORTHOGONAL WEAVE COMPOSITE

Matthew Poole (University of Surrey) Stephen Ogin (University of Surrey) Paul Smith (University of Surrey) Garry Wells (Defence Science and Technology Laboratory (DSTL)) Prasad Potluri (University of Manchester) Philip J. Withers (University of Manchester)

 

This paper presents the damage development throughout the lifetime of a five layer 3D non-crimp orthogonal woven composite fatigue loaded along the warp and weft directions.

 

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DAMAGE MECHANISMS IN THIN-PLY COMPOSITES : FREE EDGE/BULK MEASUREMENTS AND MULTISCALE MODELLING

Sébastien Kohler (Ecole Polytechnique Fédérale de Lausanne) Joel Cugnoni (Ecole Polytechnique Fédérale de Lausanne) Robin Amacher (Lab. of Applied Mechanics and Reliability Analysis, EPFL) John Botsis (Ecole Polytechnique Fédérale de Lausanne)

 

Results of simultaneous acoustic emission measurements and optical observation at the edge of unnotched quasi-isotropic symmetric tension specimen. Comparison of this data with the early results of a multiscale plane-strain model.

 

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DESIGN SPACE INTERROGATION FOR NEW C-PLY LAMINATE ARCHITECTURES

Christopher York (University of Glasgow) Sérgio Frascino Müller de Almeida (University of São Paulo)

 

This article investigates the extent to which new NCF architectures can be tailored to achieve warp free tapered laminates without the need for deposition with off axis alignment, hence ply discontinuities. Buckling strength is also considered.

 

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EFFECT OF PLY THICKNESS ON THE IMPACT RESPONSE OF INTERLEAVED NON-CRIMP-FABRIC LAMINATES

Santiago García Rodríguez (AMADE, Universidad de Girona) Vicky Singery (CHOMARAT) Philippe Sanial (CHOMARAT) Josep Costa (AMADE, Universidad de Girona)

 

The effect of ply-thickness and interleaving by non-woven thermoplastic veils on the damage resistance of thin-ply NCF laminates was studied. Non-woven polyamide veils contribute to delay delamination onset and/or to arrest their propagation.

 

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EVALUATION OF FLEXURAL MODULUS OF ULTRA-THIN CHOPPED CARBON FIBER TAPE REINFORCED THERMOPLASTICS

Yuto Nakashima (University of Tokyo) Hirofumi Suganuma (University of Tokyo) Shinichiro Yamashita (University of Tokyo) Jun Takahashi (University of Tokyo)

 

Test results by small specimens of UT-CTT, which are a kind of randomly oriented strands made by water dispersed thin tape, tend to be somewhat scattered. Flexural moduli and scatter were evaluated with prediction model and experiments.

 

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GEOMETRICALLY NONLINEAR ASYMPTOTIC HOMOGENIZATION MODELING OF A THIN COMPOSITE LAYER WITH WAVY SURFACES

Gobinda Saha (University of New Brunswick) Alexander Kalamkarov (Dalhousie University) Francesco Tornabene (University of Bologna)

 

This paper develops the geometrically non-linear composite plate model to analyze the effective elastic properties through the application of the modified asymptotic homogenization method. The analytical formulae for effective moduli are derived.

 

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INFLUENCE OF 90° LAYER THICKNESS ON DAMAGE INITIATION AND PROPAGATION IN CFRP CROSS-PLY LAMINATES

Christian Leopold (Technische Universität Hamburg-Harburg) Sergej Harder (Technische Universität Hamburg-Harburg) Christina Buggisch (Technische Universität Hamburg-Harburg) Wilfried Liebig (Technische Universität Hamburg-Harburg) Bodo Fiedler (Technische Universität Hamburg-Harburg)

 

The influence of layer thickness on failure initiation and damage propagation as matrix cracks in the 90°-layers of cross-ply laminates is investigated experimentally and simulated by using finite element simulation.

 

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