23.4.1-R8 FINITE ELEMENT SIMULATION OF THE DELAMINATION PROPAGATION OF L-SHAPED CFRTP SPECIMEN

M.AKAMATSU (THE UNIVERSITY OF TOKYO), T.MATSUO, T.OHORI, X.ZHANG, J.TAKAHASHI

This research shows a novel FE simulation technique to express the fracture behavior of CFRTP including delamination. Tensile test of L-shaped CFRTP specimen is performed. Solid elements and plastic deformation parameter enable FEM to express the experimental results.

23.4.1-R9 DAMAGE CONTROL WITHIN SKIN-STIFFENER DEBOND SPECIMENS UNDER FATIGUE CONDITIONS

R.LUTERBACHER (UNIVERSITY OF BRISTOL), R.TRASK, IP.BOND

The potential to redirect propagating delaminations in skin-stringer configurations away from critical failure paths and into dedicated self-healing zones has been experimentally investigated.

23.4.1-R10 STUDY AND ANALYSIS OF THE MECHANICAL BEHAVIOR OF REINFORCED STITCHING STIFFENERS

J.BIGAUD (UTC), Z.ABOURA, S.VERGER

Stitching techniques for composite structures constitute an interesting alternative to conventional techniques.This work focuses on manufacturing and study of mechanical behavior of stitching stiffener by OSS. This study will discuss mainly on local mechanical phenomena and their evolution with stitching.

23.4.1-R11 ANISOTROPY OF PAPER AND PAPER BASED COMPOSITES AND THE MODELLING THEREOF

H.KRÖLING (TECHNISCHE UNIVERSITÄT DARMSTADT), A.ENDRES, N.NUBBO, J.FLECKENSTEIN, F.MILETZKY et al.

Anisotropic papers were used to reinforce an epoxy resin. It was shown that the anisotropy of the paper and the composites can be connected via the Zero-Span-Tensile Index. Based on the Zero-Span-Tensile Index, the composite strength can be predicted.

23.4.1-R12 SHAPE MEMORY PERFORMANCE OF EPOXY RESIN-BASED COMPOSITES

J.KARGER-KOCSIS (BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS), M.FEJÖS

One-way shape memory epoxy resin based systems and composites have been produced and characterized. Incorporation of different reinforcements, their positioning were used to improve the recovery stress of the systems. Attempt was made to provide SMEPs with additional self-healing functionality.

23.4.1-R13 ON TRANSITION REGIONS FOR THE SIMULATION OF THE MECHANICAL RESPONSE OF COMPOSITE MATERIALS AT MULTIPLE LENGTH SCALES

L.GIGLIOTTI (IMPERIAL COLLEGE LONDON), ST.PINHO

A Mesh Superposition Technique (MST) is proposed and applied to the low-velocity impact on composite plates. Examples of 3D-3D and 3D-2D coupling are presented, showing that the technique retrieves the correct damage prediction with only 27% of the computational-cost.

23.4.1-R14 EFFECTS OF IMPACTOR MASS IN CARBON/EPOXI WOVEN LAMINATES UNDER LOW-VELOCITY IMPACT LOADING

J.PERNAS-SÁNCHEZ, JA.ARTERO GUERRERO (UNIVERSIDAD CARLOS III DE MADRID), D.VARAS, JA.LOYA, J.LÓPEZ-PUENTE

This work expands usual low-velocity impact studies including the impactor inertia as a variable, and studies its effect on the laminate damage. For this purpose, an hemispherical impactor with different masses has been impacted against CFRP woven laminates varying energies.

23.4.2-R8 FIBER COMPOSITE INTENSIVE VIRTUAL URBAN VEHICLE STRUCTURE

M.RUFF, S.VOHRER (GERMAN AEROSPACE CENTER), E.CHOWSON, M.MÜNSTER

A method is presented for supporting the development of a future urban vehicle structure made of fiber composites. The method includes various FEM optimizations in order to construct appropriately to most-ideal loading paths and the use of fiber reinforced polymers.

23.4.2-R9 BIOMECHNICAL FATIGUE ANALYSIS OF A NEW CARBON FIBER/FLAX/EPOXY COMPOSITE FOR BONE FRACTURE PLATE APPLICATIONS USING INFRARED THERMOGRAPHY

Z.BAGHERI (RYERSON UNIVERSITY), H.BOUGHERARA, I.EL SAWI, R.ZDERO

The biomechanical fatigue properties of a new CF/Flax/Epoxy composite material application have been investigated using both conventional fatigue tests and thermography analysis. This study confirmed the application of thermography analysis to rapidly determine the fatigue strength of biomedical materials.

23.4.2-R10 INTERLAMINAR FRACTURE BEHAVIOUR OF TEXTILE COMPOSITES WITH THERMOPLASTIC MATRICES

L.GORBATIKH (KU LEUVEN), S.IVANOV, SV.LOMOV

The interlaminar behaviour of textile composites with three different thermoplastic matrices: PPS, PEEK and PEEK with carbon nanotubes is compared. The received fracture toughness results are unexpected from the observations previously done from tensile tests on the same composites.

23.4.2-R11 POLYLACTIC ACID NANOCOMPOSITES REINFORCED WITH CELLULOSE NANOWHISKERS ISOLATED FROM OIL PALM EMPTY FRUIT BUNCH

A.HASSAN (UNIVERSITI TEKNOLOGI MALAYSIA), MK.MOHAMAD HAAFIZ

Polylactid acid (PLA) nanocomposites filled with cellulose nanowhiskers (CNW) isolated from oil palm empty fruit bunch microcrystalline cellulose using chemical swelling treatment were prepared. CNW increased tensile strength, Young’s modulus and thermal stability of PLA. Nanoscale structured CNW was revealed.

23.4.2-R12 BIO-INSPIRED FISHSCALE-CELLULAR COMPOSITE SYSTEM FOR PROTECTION AGAINST PENETRATION LOADS: A PROOF OF CONCEPT STUDY

YS.CHUA, E.LAW (NATIONAL UNIVERSITY OF SINGAPORE), FC.TEO, M.KANG, SD.PANG et al.

In this paper, finite element simulations are performed to examine the performance a novel composite system that combines fishscale structure with cork as an underlying material is explored for protection against penetration loads.

23.4.2-R13 NUMERICAL SIMULATION OF WEAR IN FIBER-REINFORCED COMPOSITE MATERIALS

L.RODRIGUEZ-TEMBLEQUE (UNIVERSITY OF SEVILLE)

This work presents new anisotropic wear and friction constitutive laws and its numerical implementation, to take into account the influence of the fiber orientation and the sliding direction, on the tribological behavior of FRP. Some examples show these proposed tribological-properties.

23.4.2-R14 INVESTIGATION OF A COMPOSITE TENSILE ENERGY ABSORPTION ELEMENT UNDER STATIC AND DYNAMIC LOADING

T.BERGMANN (EADS INNOVATION WORKS), S.HEIMBS, G.TREMMEL, M.MAIER

An experimental and numerical study was conducted to investigate the energy absorption capability of a tensile energy absorber, in which a metallic bolt is continuously pulled through a composite or sandwich plate, causing it to fail successively under bearing mode.

23.4.3-R8 SENSITIVITY ANALYSIS FOR EFFICIENT PARAMETERIZATIONS OF AUTOMOTIVE COMPOSITE STRUCTURES FOR CRASH

S.HESSE (BMW AG), D.LUKASZEWICZ, F.DUDDECK

A novel design workflow that can help reduce the problem complexity for composite vehicle sub-structures is introduced. A computationally efficient prognosis method that smooths the design space is proposed. Secondly a sensitivity analysis reduces the the parameter space.

23.4.3-R9 FATIGUE RESISTANCE OF TOUGHENED EPOXY RESINS MODIFIED WITH PREFORMED POLYMER PARTICLES

H.KISHI (UNIVERSITY OF HYOGO), S.MATSUDA, J.IMADE, Y.SHIMODA, T.NAKAGAWA et al.

Fatigue resistance of epoxy resins modified with preformed polyamide-12 particles was higher than the pure epoxy, irrespective of the cross-link density of the epoxy matrices. Meanwhile, the fatigue resistance of epoxy with core-shell rubber particles depended on the cross-link density.

23.4.3-R10 DOUBLE BEAM SHEAR (DBS) AS A NEW TEST METHOD FOR DETERMINING INTERLAMINAR SHEAR PROPERTIES OF COMPOSITE LAMINATES

G.ZHOU (LOUGHBOROUGH UNIVERSITY), P.NASH, J.WHITAKER, N.JONES

A new test method called Double Beam Shear is developed at Loughborough University for determining interlaminar shear properties. The DBS method guarantees ILS failure at pure ILS section. Extensive experimental validations are provided along with SBS, using various composite materials.

23.4.3-R11 INFLUENCE OF STACKING SEQUENCE ON TENSILE STRENGTH OF ORTHOTROPIC CFRP FABRICATED WITH PREPREG CONTAINING CELLULOSE NANO FIBERS (CNFS)

R.UMEKI (DOSHISHA UNIVERSITY), K.OKUBO, T.FUJII, K.KAWABE, K.KONDO et al.

Two types of stacking sequences were applied to compare the mechanical properties of CFRP modified with CNF. The application of “thick layered” sequence was effective to utilize the enhancing technique to improve the tensile strength.

23.4.3-R12 PROCESS-DEPENDENT MATERIAL PROPERTIES FOR STRUCTURAL SIMULATION OF COMPOSITES MADE BY TAILORED FIBER PLACEMENT

A.SPICKENHEUER (IPF DRESDEN), A.LEIPPRAND, L.BITTRICH, K.UHLIG, E.RICHTER et al.

This work contributes to the manufacturing induced waviness of the Tailored-Fiber-Placement (TFP)-technology. Based on experimental optical evaluation of the preform waviness different approaches for numerical modelling have been applied. Finally macroscopic simulated and experimental tested material properties have been compared.

23.4.3-R13 THEORY OF SINGLE AND MULTILAYERED MICROPOLAR ORTHOTROPIC PLATES

S.SARGSYAN (GYUMRI STATE PEDAGOGICAL INSTITUTE), A.FARMANYAN, G.HAYRPETYAN

23.4.3-R14 MODELIZATION OF ADVANCED NONWOVEN FABRICS SUBJECTED TO TENSILE LOADS

F.MARTÍNEZ-HERGUETA (IMDEA-MATERIALS), Á.RIDRUEJO, F.GÁLVEZ, C.GONZÁLEZ, J.LLORCA

The aim of this study es the determination of the deforming micromechanisms of needlepunched felts subjected to tensile loads. A constitutive model was developed which provided the response including micromechanical aspects as fiber sliding and pull-out.

23.4.4-R8 STRUCTURAL DESIGN AND OPTIMIZATION OF VACUUM INFUSION MANUFACTURING PROCESS FOR THE FIBERGLASS HOPPER CAR BODY

I.SERGEICHEV (SKOLKOVO INSTITUTE OF SCIENCE AND TECHNOLOGY), B.FEDULOV, A.SAFONOV, A.USHAKOV, N.ROZIN et al.

Structural design and stress analysis, testing of coupons and subcomponent specimens,optimization of vacuum infusion manufacturing process realized for the new fiberglass hopper car body are presented.

23.4.4-R9 INVESTIGATIONS ABOUT THE INFLUENCES OF TEMPERATURE AND OIL ON THE FATIGUE BEHAVIOR OF SHORT GLASS FIBER REINFORCED POLYAMIDE 6.6

J.DECKER, R.BRÜLL, T.SCHUSTER, H.OEHLER, A.BÜTER (FRAUNHOFER LBF) et al.

For the estimation of the interactions between vibration loading & the simultaneously effect of liquid media on PA different analytic methods were used to study the modification of the material by chemical mechanisms. The findings were related to fatigue tests.

23.4.4-R10 MECHANICAL AND THERMAL CHARACTERISTICS OF THE PARTICLES REINFORCED PHENOLIC FOAMS

SA.SONG (CHONBUK NATIONAL UNIVERSITY), SS.KIM

The phenolic foam was fabricated by using microwave and nano-particles such as multiwall carbon nanotube and graphene were mixed to improve the thermal and mechanical properties of the phenolic foam.

23.4.4-R11 THERMAL AND MECHANICAL PROPERTIES OF PLA /PEG BLEND AND ITS NANOCOMPOSITES

H.CELEBI (ANADOLU UNIVERSITY), A.KURT

In this study, nanocomposites of polylactic acid-polyethylene glycol (PLA-PEG) blend and cellulose nanocrystals were prepared. The composites were prepared by melt extrusion technique. The nanoparticles were modified in order to achieve homogeneous dispersion in polymer matrix.

23.4.4-R12 LONG-TERM BEHAVIOUR ANALYSIS OF RECYCLED ELASTOMERIC MATERIAL FOR HIGH DAMPING VIBRATION LEVELS INDUCED BY RAILWAYS

JA.CASADO (UNIVERSIDAD DE CANTABRIA), S.DIEGO, I.CARRASCAL, D.FERREÑO, J.CARDONA et al.

The use of end-of-life tires as anti-vibration systems in railways is simulated by FEM. The methodology used to assess the Insertion Loss, provided by the system is shown. The prototype mats are mechanically validated under dynamic efforts according to standards.

23.4.4-R13 PHYSICAL MICRO-FIELDS IN LARGE ASPECT RATIO FIBROUS COMPOSITES BY MESHLESS METHOD

M.ZMINDAK (UNIVERSITY OF ŽILINA), Z.MURCINKOVÁ, V.KOMPIS

The paper deals with modelling of mainly thermal and mechanical micro-fields caused by interactions of matrix and large-aspect fibres in composite materials. The developed Method of Continuous Source Functions eliminates disadvantages of known numerical methods and reduces the solution considerably.