25.2.1-R15 NUMERICAL MODELLING OF STRAIN RATE EFFECTS ON A WOVEN COMPOSITE FABRIC

JC.GULDNER (GEM (ECOLE CENTRALE DE NANTES)), P.ROZYCKI, L.GORNET, P.CARTRAUD, L.MARCIN

Woven interlock composites are increasingly used to design aircraft structures. This textile composite depicts a nonlinear behavior along orthotropic directions. In the present work, static and dynamic tensile tests are performed. A new 3D rate dependent model is proposed.

25.2.1-R16 THE INVESTIGATION OF MECHANICAL BEHAVIOUR OF CYLINDRICAL STRUCTURES COMPRISING SANDWICH FIBRE REINFORCED PLASTIC COMPOSITES

D.ZELENIAKIENE (KAUNAS UNIVERSITY OF TECHNOLOGY), V.LEISIS, P.GRISKEVICIUS

A methodology for the investigation of stiffness and strength of cylindrical structures made of sandwich composite with facesheets made from glass fibre and polyvinylester resin and a core made from recycled paper hexagonal honeycomb impregnated with polyvinylester resin was deduced.

25.2.2-R15 SIZE AND GEOMETRY EFFECTS ON THE OPEN-HOLE STRENGTH OF COMPOSITE LAMINATE SPECIMENS. FINITE FRACTURE MECHANICS PREDICTIONS AND TEST RESULTS

FF.CARMONA (UNIVERSIDAD DE SEVILLA), V.MANTIČ, J.CAÑAS

The strength of open-hole composite laminate specimens under tension is studied. The role of the stress concentrator size and specimen geometry on the crack onset is clarified. Predictions by the coupled stress-energy criterion of FFM are compared with experimental data.

25.2.2-R16 CHARACTERISTIC OF THE INSERT JOINT STRENGTH OF COMPOSITE SANDWICH PANEL OF FORMOSAT-5 REMOTE SENSING INSTRUMENT

HC.HUNG (NATIONAL SPACE ORGANIZATION), JC.KUO, MY.YANG

FORMOSAT-5 is the first space program that National SPace Organization (NSPO) takes full responsibility for the satellite and the payload, the Remote Sensing Instrument (RSI). This paper experimentally studies the mechanical characteristics of composite sandwich insert joints for the RSI.

25.2.3-R15 TENSILE BEHAVIOR OF PULTRUDED COMPOSITE RODS EXPOSED TO DIFFERENT ENVIRONMENTAL CONDITIONS

LV.SILVA (UFRGS), FW.SILVA, FF.LUZ, JR.TARPANI, S.CAMPOS AMICO

This work presents an experimental study on the residual tensile strength of four types of pultruded rods made of carbon and glass fibers reinforcing epoxy and vinyl-ester polymer matrices subjected to accelerated degradation in sea water and hot water

25.2.3-R16 PREPARATION OF POROUS CORE CFRP SANDWICH PANEL WITH LOW OUT-OF-PLANE DEFORMATION

T.MAEDA (TOKYO UNIVERSITY OF SCIENCE), M.ISHIKAWA, Y.KOGO, T.KAMIYA, S.UTSUNOMIYA

As a new material suitable for primary mirrors of space telescopes, we focused on porous core CFRP sandwich panels. However out-of-plane deformations appeared at ROHACELL core sandwich panels. Therefore, we focused on GRAFOAM core which has a low expansion coefficient.

25.2.4-R15 MECHANICAL BEHAVIOUR OF HYGROTHERMAL CONDITIONED FIBER METAL LAMINATES

B.SUROWSKA (LUBLIN UNIVERSITY OF TECHNOLOGY), K.MAJERSKI, J.BIENIAŚ, G.KŁOSOWSKI

The effects of elevated temperature and moisture conditioning of FMLs Al/glass-epoxy and Al/carbon-epoxy on some mechanical properties were studied by tensile, share,ILSS tests. Results show the differences in moisture absorption and strength degradation of FMLs and FRP composites after conditioning.

25.2.4-R16 FLEXURAL BEHAVIOUR OF SANDWICH PANELS WITH GRADED CORE: A PIECEWISE EXPONENTIAL MODEL

M.KASHTALYAN (UNIVERSITY OF ABERDEEN), B.WOODWARD, I.GUZ

A piecewise exponential model for analysis of three-dimensional elastic deformation of sandwich panels with arbitrary stiffness gradient in the core is developed and validated using literature data and finite element predictions based on user-implemented graded elements.

25.2.5-R15 EXPERIMENTAL INVESTIGATION AND MODELING OF THE BEHAVIOR OF COMMINGLED YARNS

JE.ROCHER (LABORATOIRE PRISME), S.ALLAOUI, G.HIVET, E.BLOND

Tensile behavior of commingled yarns is experimentally investigated. Values of modulus, breaking stress and strain and their dependence to strain rate, gauge length and weaving damage are evaluated. A model is proposed to describe accurately their full stress-strain tensile behavior.

25.2.5-R16 FREE VIBRATION OF AXIALLY LOADED FUNCTIONALLY GRADED SANDWICH BEAMS USING REFINED SHEAR DEFORMATION THEORY

T.VO (NORTHUMBRIA UNIVERSITY), A.OSOFERO, M.CORRADI, F.INAM

Free vibration of axially loaded functionally graded sandwich beams using refined shear deformation theory is presented. FEM and Navier solution are developed to determine the natural frequencies of sandwich beam for various power-law index, skin-core-skin thickness ratios and boundary conditions.

25.2.6-R15 ELECTRO FUSION JOINING OF CARBON FIBER REINFORCED THERMOPLASTIC COMPOSITES USING CARBON FIBER HEATING ELEMENT

D.TANABE (OSAKA UNIVERSITY), K.NISHIYABU, T.KURASHIKI

This study aims to develop the electro-fusion joining method for continuous fiber reinforced thermoplastic composites using spread carbon fiber as resistance heating element. As the result of the single lap shear strength test, the LSS value was achieved 27 MPa.

25.2.6-R16 ANALYTICAL HOMOGENIZATION OF HONEYCOMB WITH SKIN AND HEIGHT EFFECTS IN SANDWICH PLATES

MP.HOANG (UNIVERSITY OF REIMS), M.KHALFALLAH, Y.LI, B.ABBES, YQ.GUO et al.

Analytical homogenization of honeycomb core in sandwich plates is presented. Skin effect leads to very different behaviors compared to classical models. This enables to determine the upper/lower bounds of equivalent rigidities, and to study the influence of the core height.

25.2.7-R15 EVALUATION OF SURFACE TREATMENTS FOR ADHESION OF THERMOPLASTIC COMPOSITES FOR AUTOMOTIVE USE

C.SATO (TOKYO INSTITUTE OF TECHNOLOGY), Y.SEKIGUCHI, H.OKAMOTO, K.SHIMAMOTO, M.KATANO et al.

Methods for treating the surface of thermoplastic composites before adhesion have experimentally been investigated. Specimens comprising of GFRP which have matrix resins of polyamide or polypropylene, were bonded with an acrylate adhesive after several types of surface treatments, and tested.

25.2.7-R16 EXPERIMENTAL AND NUMERICAL ANALYSES OF ANISOTROPIC BEHAVIOUR OF PU FOAM

M.CHUDA-KOWALSKA (POZNAN UNIVERSITY OF TECHNOLOGY), A.GARSTECKI

Polyurethane foam with a closed-cell structure and low density used in sandwich panels is analysed. A series of experiments carried out to determine elastic parameters of the foam in proper way. The tests revealed a pronounced anisotropy of the material

25.2.8-R15 STUDY OF THE ADHESIVE BONDING OF A THERMOPLASTIC COMPOSITE MATERIAL BASED ON POLYPROPYLENE AND GLASS FIBER

E.RODRIGUEZ-SENIN, C.PALLEIRO PALMOU (AIMEN TECHNOLOGY CENTER), R.LOSADA, R.DE LA MANO

The results obtained in the set-up of the adhesive bonding process applied to polypropylene reinforced with glass fiber are presented. An epoxy adhesive and three different surface treatments were tested.

25.2.8-R16 VIBRATION AND DAMPING PERFORMANCES OF CARBON FIBER COMPOSITE PYRAMIDAL TRUSS SANDWICH PANELS EMBEDDED WITH VISCOELASTIC LAYERS

J.YANG (HARBIN INSTITUTE OF TECHNOLOGY), J.XIONG, L.MA, L.WU

The vibration and damping of hybrid carbon fiber composite pyramidal truss sandwich panels with viscoelastic layers embedded in the facesheets were investigated in this paper.The structural damping loss factors increased distinctly due to the viscoelastic layer embedded in the facesheets.

25.2.9-R15 FIRE RETARDANT PROPERTIES OF HDPE COMPOSITE BASED ON MODIFICATION OF NA-MMT TREATED WITH PHENOL FORMALDEHYDE RESIN MODIFIED BY SOME SILANE REAGENTS

M.NOUR (NATIONAL INSTITUTE FOR STANDARDS (NIS),), SS.ELMORSY, R.SALTOUT

Fire behavior of HDPE composites containing PFS1 or PFS2 and their modification with clay were studied.The results of cone calorimeter shows that the pHRR of HDPE composites were decreased in comparison with the pure HDPE.

25.2.9-R16 ANALYSIS OF MECHANICAL PROPERTIES OF COMPOSITE SANDWICH PANELS WITH FILLERS

AN.ANOSHKIN, V.ZUIKO (PERM NATIONAL RESEARCH POLYTECHNIC UNIVERSITY), A.GLEZMAN

This work is dedicated to experimental-theoretical analysis of mechanical properties of sandwich panels made of fibrous polymer composite materials with different types of core: tubular, honeycomb and cellular.