Book of Abstracts

R. Joffe, L. Pupure, J. Varna, L. Wallström (Editors)

Keynote Lectures

201. DAMAGE AND STRENGTH PREDICTIONS OF 3D WOVEN COMPOSITE STRUCTURES: EXPERIMENTAL CHARACTERIZATION, SIZE EFFECT AND MODELLING

F. Laurin1, V. Medeau1,2,3 S. Mousillat3 and J. Rannou1

1ONERA/DMAS - Université Paris Saclay, 92322 Châtillon, France
2ISAE-SUPAERO / Clément Ader Institute, 31400 Toulouse, France
3Safran Aircraft Engines, 77550 Moissy-Cramayel France

Keywords: 3D woven composites, fracture toughness, size effect, non-linear fracture mechanics

202. TESTING AND MODELLING OF NCF AND THIN PLY COMPOSITES DURING IMPACT, CRASH AND TRIAXIAL LOADING

Robin Olsson1

1RISE SICOMP, Box 104, SE-431 22 Mölndal, Sweden

Keywords: Polymer composites, NCF, Thin ply composites, Impact, Crash

203. UNCONVENTIONAL EXPERIMENTAL APPROACHES TO INVESTIGATE THE COMPRESSIVE BEHAVIOUR OF CARBON FIBRE COMPOSITES

Michael R. Wisnom1

1Bristol Composites Institute (ACCIS), University Walk, Bristol, BS8 1TR, UK

Keywords: Compression, Bending, Hybrids, Size effect, Strain gradient

Oral and Poster Contributions

102. IMPROVING DELAMINATION FRACTURE TOUGHNESS IN MULTI-DIRECTIONAL LAMINATES USING INTERLOCKED THIN-PLY REINFORCEMENTS

John-Alan Pascoe1, Soraia Pimenta2 and Silvestre T. Pinho1

1Department of Aeronautics, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom
2Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom

Keywords: Fracture toughness, Damage tolerance, Interlaminar reinforcement, Thin-ply, Ply-level structures

103. BEARING FATIGUE LIFETIME AND CAI CAPABILITY OF FIBRE METAL LAMINATES

B. Fiedler1, R. Adelung2, M. Baytekin-Gerngross2, E. Sprecher1, J. Wegner1, M.-D. Gerngross2, J. Carstensen2, B. Bosbach1

11Institute of Polymer and Composites, Hamburg University of Technology, Denickestr. 15, 21073 Hamburg, Germany
2Chair for Functional Nanomaterials, Faculty of Engineering, Kiel University, Kaiserstr. 2, 24143 Kiel, Germany

Keywords: Hybrid, FML, impact behaviour, surface treatment, nanoscale sculpturing

104. OFF-AXIS IBUS TEST FOR HIGH STRAIN RATE TESTING OF UD COMPOSITES

Xavier Régal1, Fabrice Pierron1

1Faculty of Engineering and Physical Sciences, University of Southampton, University Road, Southampton SO17 1BJ, UK

Keywords: High strain rate, high speed imaging, Virtual Fields Method, Grid Method, ultrasonics

105. MECHANICAL AND FUNCTIONAL CHARACTERISATION OF FLAX / RECYCLED CARBON FIBRE HYBRID COMPOSITES

Marco L. Longana1, Vaclav Ondra1, and Ian Hamerton1

1Bristol Composites Institute (ACCIS), Department of Aerospace Engineering, School of Civil, Aerospace, and Mechanical Engineering, Queen's Building, University of Bristol, University Walk, Bristol, BS8 1TR, UK

Keywords: Flax Fibres, Recycled Carbon Fibres, Vibration Damping, Tensile Properties

106. DEVELOPMENT OF A NEW HYBRID COMPOSITE PEDICLE SCREW: NUMERICAL AND EXPERIMENTAL INVESTIGATION

Yves N. Becker1, Nicole Motsch1 and Joachim Hausmann1

1Institut für Verbundwerkstoffe GmbH, Erwin-Schrödinger-Straße, Geb. 58, 67663 Kaiserslautern, Germany

Keywords: CF-PEEK, Finite element modelling, Hybrid structure, Parametric optimization, Pedicle screw

108. ANALYSIS OF FATIGUE-DRIVEN DELAMINATION UNDER GENERAL LOADING

Laura Carreras1, Jordi Renart2,3, Brian L. V. Bak1, Esben Lindgaard1 and Albert Turon2

1Department of Materials and Production, Aalborg University, Fibigerstraede, 16, 9220 Aalborg, Denmark
2AMADE, University of Girona, C. Universitat de Girona, 4, 17003 Girona, Spain
3Serra Húnter Fellow, Generalitat de Catalunya, Spain

Keywords: delamination crack propagation, interlaminar fatigue damage, 3D damage analysis, cohesive zone modelling, benchmark testing

109. PREDICTION AND EXPERIMENTAL VALIDATION OF THE NOTCH (IN)SENSITIVITY OF TOW BASED DISCONTINUOUS COMPOSITES

Marco Alves1, Soraia Pimenta1, Yizhuo Li1, Tahreem Naveed1, Florian Gaudron1

1Department of Mechanical Engineering, South Kensington Campus, Imperial College, London, SW7 2AZ, United Kingdom

Keywords: Discontinuous composites, Notch-sensitivity, Numerical modelling

110. MICROMECHANICAL MODEL OF CROSS-OVER FIBER BRIDGING

Frode Grytten1, Bent F. Sørensen2, Stergios Goutianos2, Reidar K. Joki3 and Jens K. Jørgensen1

1SINTEF Industry, Department of Materials and Nanotechnology, PB 124 Blindern, NO-0314 Oslo, Norway
2Department of Wind Energy, Technical University of Denmark, DK-4000 Roskilde, Denmark
33FiReCo AS, Storgata 15, NO-1607 Fredrikstad, Norway

Keywords: Polymer composites, Fracture resistance, Bridging laws

111. DEVELOPMENT AND FINITE ELEMENTS ASSESSMENT OF STACKING SEQUENCES FOR INTERLAMINAR FRACTURE TOUGHNESS TESTING OF ANGLE-PLY INTERFACES

Torquato Garulli1,2, Anita Catapano3, Daniele Fanteria2 and Julien Jumel1

1University of Bordeaux, Laboratory I2M CNRS UMR 5295, 33400 Talence, France
2University of Pisa, Civil and Industrial Engineering Department, Aerospace Section, 56122 Pisa, Italy
3Bordeaux INP, University of Bordeaux, Laboratory I2M CNRS UMR 5295, 33400 Talence, France

Keywords: Delamination, Fracture toughness, Laminated composites, Finite elements analysis, Angle-ply interfaces

112. A NOVEL TEST METHOD FOR THE INVESTIGATION OF THE COMBINED INFLUENCE OF THROUGH-THICKNESS COMPRESSION AND SHEAR STRESSES ON THE LONGITUDINAL FIBRE TENSILE STRENGTH OF CARBON FIBRE REINFORCED POLYMERS

Kilian Gruebler1, Stephen R. Hallett1 and Michael R. Wisnom1

1Bristol Composites Institute (ACCIS), University of Bristol, Queen’s Building, University Walk, Bristol, BS8 1TR, UK

Keywords: Fibre Failure, Complex Stress State, Polymer Composites, Digital Image Correlation, Finite Elements

113. AN INTEGRATED MACHINE LEARNING AND FINITE ELEMENT ANALYSIS FRAMEWORK, APPLIED TO COMPOSITE SUBSTRUCTURES INCLUDING DAMAGE

Tom Gulikers1, and Boyang Chen1

1Faculty of Aerospace Engineering, TU Delft, Kluyverweg 1, 2629 HS, Delft, The Netherlands

Keywords: Machine learning, Neural networks, Finite elements, Substructures, Homogenisation

114. FRICTION TESTS FOR SIMULATION OF ENERGY ABSORBING COMPOSITE STRUCTURES

Thomas Bru1, and Robin Olsson1

1RISE SICOMP, PO Box 104, SE-431 22 Mölndal, Sweden

Keywords: Friction test, Non-crimp fabric, Finite element analysis

115. HIGH STRAIN RATE MICROMECHANICAL TESTING OF COMPOSITE MATERIALS

Mario Rueda-Ruiz1,2, Ben D. Beake3 and Jon M. Molina-Aldareguia1

11IMDEA Materials Institute, C/Eric Kandel 2, 28906 Getafe, Madrid, Spain
2Department of Materials Science, Universidad Politécnica de Madrid, E. T. S. de Ingenieros de Caminos, 28040 Madrid, Spain
3Micro Materials Ltd, Willow House, Yale Business Village, Ellice Way, Wrexham LL13 7YL, UK

Keywords: Micromechanics of composite materials, Nano-impact, Dynamic mechanical properties, Finite element modelling

116. CHARACTERISATION OF BEARING ENERGY ABSORPTION OF THIN-PLY BASED DISCONTINUOUS COMPOSITE

Sachin Francis1, Christopher Cameron1, Leif E. Asp2 and Maciej Wysocki3

1RISE SICOMP, Argongatan 30, SE 431 53, Gothenburg, Sweden
2Department of Industrial and Material Science, Chalmers University of Technology, Hörsalsvägen 7A, SE 412 96, Gothenburg, Sweden
3RISE Research Institute of Sweden, Box 857, SE 501 15, Borås, Sweden

Keywords: Discontinuous Composite, Bearing, Mechanical properties, Energy absorption

117. NONDESTRUCTIVE CHARACTERIZATION OF DAMAGE IN POLYMER MATRIX COMPOSITES FOR ENHANCED LIFE MANAGEMENT

Eric A. Lindgren1, John Aldrin2, John Wertz1, Norm Schehl3, John Welter1, David Zainey3, Victoria Kramb3, Michael Uchic1, and Sarah Wallentine1

1US Air Force Research Laboratory, 2230 10th Street, WP AFB, OH 45433, USA
2Computational Tools, Gurnee, Il 60031 USA
3University of Dayton Research Institute, 2230 10th Street, WP AFB OH 45433

Keywords: Polymer composites, Nondestructive evaluation, Ultrasound, Life management

118. DEFORMATION RATE EFFECTS ON TENSILE PROPERTIES OF NaOH TREATED RAMIE FIBER/PLA/PBAT COMPOSITES

Masahiro Nishida1, Shigeru Bito1, Hiroaki Ito2 and Norio Fukuda3

1Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, Japan
2Aichi Center for Industry and Science Technology, Owari Textiles Research Center, 35 Aza-Miyaura, Mabiki, Yamato-cho, Ichinomiya, Aichi, Japan
33Aichi Center for Industry and Science Technology, Industrial Research Center, 1-157-1 Onda-cho, Kariya, Aichi, Japan

Keywords: Natural fiber, Fiber treatment, Green Composites, Polymer blend

119. REALISING IMPACT DAMAGE TOLERANT BOULIGAND AND HERRINGBONE/BOULIGAND THIN-PLY CFRP STRUCTURES

Lorenzo Mencattelli1, and Silvestre T. Pinho1

1Department of Aeronautics, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom

Keywords: Herringbone, Damage tolerance, Bouligand, Bio-inspired, CFRP

120. CRACK MIGRATION: EXPERIMENTS AND NUMERICAL MODELLING ON ANGLE-PLY LAMINATES

Miguel Herráez1, Georgios Pappas1, Charlie Blondeau1, John Botsis1

1Laboratory of Applied Mechanics and Reliability Analysis (LMAF-STI), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland

Keywords: Crack migration, Angle-ply laminates, Fibre-reinforced polymer, Cohesive zone model

121. AN EXPERIMENTAL PROCEDURE TO CHARACTERIZE ADHESIVE JOINTS LOADED IN SHEAR

Ainhoa Arrese1, Faustino Mujika1, Carlos Sarrado2, Jordi Renart2

1Materials+Technologies Group/ Mechanics of Materials, (UPV/EHU), San Sebastián, Spain
2AMADE, Polytechnic School (II), University of Girona, Girona, Spain

Keywords: Adhesive layer; Cohesive law; J-Integral; Experimental method, Mode II

122. NUMERICAL METHODS FOR TEMPERATURE CHARACTERISATION OF CFRP INTERFACE BEHAVIOUR USING CURRENT INSERTION TESTS

Juan P. Márquez Costa1, Cédric Huchette1 and Damien Halm2

11DMAS, ONERA, Université Paris Saclay, 29 Avenue de la Division Leclerc, 92320 Châtillon, France
2DPMM, Institut P’ – ISAE-ENSMA, Téléport 2, 1 Avenue Clément Ader, 86360 Futuroscope Chasseneuil Cedex, France

Keywords: Polymer composites, Delamination, Viscous interface behaviour, Temperature analysis

123. INVESTIGATION ON MODE I CRACK PROPAGATION AND MORPHOLOGY OF ANTISYMMETRIC CFRP LAMINATES

Charlie Blondeau1, Georgios Pappas1, Miguel Herráez1 and John Botsis1

1Laboratory of Applied Mechanics and Reliability Analysis (LMAF-STI), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland

Keywords: Fiber bridging, Crack migration, Mode I, Laminated composites

124. AN EFFICIENT METHOD TO OBTAIN THE COHESIVE LAWS OF BONDED JOINTS IN MODE I AND MODE II FRACTURE TESTS

S. Abdel Monsef1,2, J. Renart1,3, A. Turon1 and P. Maimí1

1AMADE, Polytechnic School, University of Girona, Campus Montilivi s/n, 17071 Girona, Spain
2Structural Engineering Dept., Faculty of Engineering, Zagazig University, P.O. Box 44519, Zagazig, Sharkia, Egypt
3Serra Húnter Fellow, Generalitat de Catalunya, Spain

Keywords: Cohesive law, Mode I, Mode II, DCB, ENF, ELS, Bonded joints

126. GROWTH DRIVING DIRECTION CRITERION AND ITS APPLICATIONS FOR DELAMINATIONS WITH LARGE-SCALE DAMAGE PROCESS ZONES

Brian L. V. Bak1, Laura Carreras1, Jordi Renart2,3, Esben Lindgaard1, and Albert Turon2

11Department of Materials and Production, Aalborg University, Fibigerstraede, 16, 9220 Aalborg, Denmark
2AMADE, University of Girona, C. Universitat de Girona, 4, 17003 Girona, Spain
3Serra Húnter Fellow, Generalitat de Catalunya, Spain

Keywords: delamination crack propagation, large-scale fracture process zones, 3D delamination analysis, cohesive zone modeling, growth driving direction

128. GEOMETRICALLY NONLINEAR REGULARIZED EXTENDED FINITE ELEMENT ANALYSIS OF BUCKLING OF COMPOSITES

Jeffrey S. McQuien1, Endel V. Iarve2 and David H. Mollenhauer3

1Institute for Predictive Performance Methodology, University of Texas at Arlington, Fort Worth, TX, U.S.
2Department of Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, TX, U.S.
33Composites Branch, AFRL/RX, Wright Patterson AFB, U.S.

Keywords: Polymer composites, Delamination, Buckling, r-Extended Finite elements

129. INFLUENCE OF TEMPERATURE AND IMPACT ENERGY ON LOW-VELOCITY IMPACT DAMAGE AND RESIDUAL COMPRESSIVE STRENGTH OF CFRP

Johann Körbelin1, Bodo Fiedler1

1Institute of Polymer Composites, Hamburg University of Technology, Denickestraße 15, 21073 Hamburg, Germany

Keywords: Carbon Fibre, Damage Tolerance, Delamination, Thermomechanical, Mechanical testing

130. MULTISCALE MODELLING OF A THICK CARBON FIBRE SHEET MOULDING COMPOUND AUTOMOTIVE COMPONENT: FROM MANUFACTURING TO STRUCTURAL SIMULATION

Luca M. Martulli1, Marco Alves3, Martin Kerschbaum1, Soraia Pimenta3, Stepan V. Lomov2 and Yentl Swolfs2

1Toyota Motor Europe, Material Engineering, Hoge Wei 33, 1930, Zaventem, Belgium
2Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 box 2450, 3001 Leuven, Belgium
3meComposites, Department of Mechanicals Engineering, Imperial College London, South Kensington Campus, SW7 2AZ London, UK

Keywords: Sheet Moulding Compounds, Compression moulding, Multiscale modelling, Composites structures

131. STUDY OF INFLUENCE OF MODIFY MANUFACTURING PARAMETERS ON DELAMINATION PROPERTIES IN A UNDIRECTIONAL GLASS FIBER/EPOXY RESIN COMPOSITE

Luis Torres1, Victor Tuninetti2, Paulo Flores3 and Gonzalo Pincheira1

1Department of Industrial Technologies, University of Talca, Camino a los Niches km1, Curicó, Chile
2Department of Mechanical Engineering, UFRO, Francisco Salazar 1145, Temuco, Chile
3Department of Mechanical Engineering, UDEC, Edmundo Larenas S/N, Concepción, Chile

Keywords: Fiber volume fraction, Glass fiber/epoxy, Delamination, Carbon nanotube, Interface angle

132. THE TRANSLAMINAR FRACTURE TOUGHNESS OF HIGH-PERFORMANCE POLYMER FIBRE COMPOSITES AND THEIR CARBON FIBRE HYBRIDS

Yoran Geboes1,2, Amalia Katalagarianakis1, Jan Ivens1, Yentl Swolfs1

1Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 box 2450, 3001 Leuven, Belgium
2SIM vzw, Technologiepark 48, BE-9052 Zwijnaarde, Belgium

Keywords: Polymer composites, Translaminar fracture toughness, High-performance polymer fibres, Compact tension

133. FIBRE BREAKS IN INTERLAYER HYBRID COMPOSITES DETECTED WITH IN-SITU SYNCHROTRON COMPUTED TOMOGRAPHY AND SIMULATED WITH A FIBRE BREAK MODEL

Francisco Mesquita1, Christian Breite1, Yentl Swolfs1, Stepan V. Lomov1 and Larissa Gorbatikh1

1Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 box 2450, 3001 Leuven, Belgium

Keywords: Synchrotron CT, Hybrid composites, Fibre breaks, Modelling

134. AN ELEMENT TEST SPECIMEN WITH PLY DROPS TO STUDY FATIGUE CRACK GROWTH RATES AT GEOMETRY TRANSITIONS

Stergios Goutianos1 and Bent F. Sørensen1

1Department of Wind Energy, Section of Composite Mechanics and Structures, Technical University of Denmark, DK-4000 Roskilde, Denmark

Keywords: Ply drop, Delamination, Tunneling crack, Cyclic loading

135. THE EFFECT OF STEAM EXPLODED FIBRES ON THE MECHANICAL PERFORMANCE OF POLYMER COMPOSITE

Pooria Khalili1, Brina Blinzler1 and Roland Kádár2

1Division of Materials and Computational Mechanics, Department of Industrial and Materials Science, Chalmers University of Technology, Se-412 96 Gothenburg, Sweden
2Division os Engineering Materials, Department of Industrial and Materials Science, Chalmers University of Technology, Se-412 96 Gothenburg, Sweden

Keywords: Thermoplastic composites, Steam exploded fibres, Mechanical properties

136. TRANSVERSE CRACKING IN THIN PLY-COMPOSITES: MESOSCALE MODELLING AND ACCURATE PREDICTIONS

Sébastien Kohler1, Joël Cugnoni1, John Botsis1

1Laboratory of Applied Mechanics and Reliability Analysis (LMAF-STI), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland

Keywords: Thin-ply, size effects, multiscale modelling,transverse cracking, cohesive elements

137. IMPROVING THE WEAK IMPACT RESISTANCE AND TOLERANCE OF THIN PLY BASED THIN LAMINATES USING NOVEL UNSYMMETRICAL LAMINATE DESIGN

Aravind Sasikumar1, Josep Costa1, Daniel Trias1, Peter Linde2,3

1AMADE, University of Girona, Campus Montilivi s/n 17073, Girona, Spain
2Airbus Operations GmbH, Kreetslag 10, 21129 Hamburg, Germany
3Chalmers University of Technology, Department of Industrial and Materials Science, S-41296, Gothenburg, Sweden

Keywords: Thin plies, Non-crimp fabrics, Impact behaviour, Damage tolerance, Unsymmetrical laminates

138. ELIMINATION OF VOLUME REDUNDANCY IN EMBEDDED ELEMENTS/COHESIVE ZONES MODELLING OF INTERFACE AND MATRIX DAMAGE MODELLING IN FIBRE REINFORCED COMPOSITES

Fangzhou Lu1, Pavel Druzhinin2, Qiang Liu3, Dirk Vandepitte2, Larissa Gorbatikh3 and Stepan V. Lomov3

1State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, 210016 Nanjing, P.R. China
2Department of Mechanical Engineering, KU Leuven, Kasteelpark Arenberg 41 bus 2420, 3001 Leuven, Belgium
3Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 bus 2450, 3001 Leuven, Belgium

Keywords: Fibre reinforced composites, Embedded zones, Cohesive zones, Progressive damage

139. ON OPTICAL FIBER BRAGG GRATINGS FOR IN-SITU CURE-INDUCED STRAIN MEASUREMENTS

Lars P. Mikkelsen1, Jonas Huether1,2, Gilmar Pereira1 and Hans Lilholt1

1Composite Mechanics and Structures, DTU Wind Energy, DTU Risø Campus, 4000 Roskilde, Denmark
2Karlsruhe Institute of Technology, Institute for Applied Materials, Hybrid and Lightweight Materials, Kaiserstraße 12, 76131 Karlsruhe, Germany

Keywords: Residual stresses, Fatigue, Glass-fibre composites, Wind turbine blades

140. IMPROVING THE ARCAN SPECIMEN FOR COMBINED TENSION/COMPRESSION AND SHEAR TESTING OF FIBRE REINFORCED COMPOSITES

Tobias Laux1, Khong Wui Gan2, Janice M. Dulieu-Barton1 and Ole T. Thomsen1

1Faculty of Engineering and Physical Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
2University of Southampton Malaysia, Kota Ilmu Educity at Iskandar, 79200 Iskandar Puteri, Johor, Malaysia

Keywords: Polymer composites, Multiaxial testing, Modified Arcan fixture, Specimen optimisation

141. X-RAY CT IMAGING AND MODELING OF FLEXURE-INDUCED DAMAGE IN TAPE-LAMINATES

Brian Wingate1, David H. Mollenhauer2 and Michael Czabaj1

1Department of Mechanical Engineering, University of Utah, Salt Lake City, Utah 84112, USA
2Air Force Research Laboratory, RX Directorate, Wright-Patterson AFB, OH 45433, USA

Keywords: X-ray Computed Tomography, In-Situ Testing, Transverse Fracture, Delamination, Progressive Damage Modeling

142. POLYETHER SULFONE INTERLEAVED GLASS/CARBON HYBRID COMPOSITE UNDER IMPACT LOADING

Sakineh Fotouhi1, Joseph Clamp2, Amir Bolouri2, Mohamad Fotouhi1

1Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran
2Department of Engineering Design and Mathematics, University of the West of England (UWE), Bristol, BS16 1QY, UK

Keywords: Glass/Carbon, Hybrid, Impact, Interleaving, Polyether sulfone

143. ON THE IN-SITU EFFECT UNDER TRANSVERSE SHEAR AND THE ASSOCIATED THIN-PLY LAMINATE IMPACT RESPONSE

S. M. García-Rodríguez1, J. Costa1, V. Singery2, A. Sasikumar1

1AMADE research group, University of Girona, Av. Universitat de Girona, 4. 17003 Girona, Spain
2Chomarat, 39 Avenue de Chabannes, 07160, Le Cheylard, France

Keywords: X-ray tomography, thin-plies, impact, in-situ effect

144. ELASTIC PROPERTIES OF COMPOSITE LAMINATES IN THE PRESENCE OF OFF-AXIS CRACKS AND DELAMINATION: MODELLING AND MEASUREMENTS

Paolo A. Carraro1, Lucio Maragoni1, Marino Quaresimin1

1Department of Management and Engineering, University of Padova, Stradella S. Nicola, 3, Vicenza, Italy

Keywords: Stiffness degradation, shear lag, off-axis crack, delamination

146. FIBRE-RELATED DAMAGE EVOLUTION IN UNIDIRECTIONAL PLIES UNDER CYCLIC TENSION LOADINGS

Paolo A. Carraro1, Lucio Maragoni1, Oscar Castro2, Marino Quaresimin1

1Department of Management and Engineering, University of Padova, Stradella S. Nicola, 3, Vicenza, Italy
2Department of Wind Energy, Technical University of Denmark, Denmark

Keywords: Fatigue, damage evolution, fibre failure

148. SPLIT-DISK TEST WITH 3D DIGITAL IMAGE CORRELATION STRAIN MEASUREMENT FOR FILAMENT WOUND COMPOSITES

Yinglun Zhao1,3, Pavel Druzhinin2,3, Kirill Ilin1,3, Jan Ivens4, Dirk Vandepitte2, Stepan V. Lomov1,3

1Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 bus 2450, B-3001 Leuven, Belgium
2Department of Mechanical Engineering, KU Leuven, Kasteelpark Arenberg 44 bus 2420, B-3001 Leuven, Belgium
3SIM vzw, Technologiepark 935, B-9052 Zwijnaarde, Belgium
4Department of Materials Engineering, KU Leuven Campus De Nayer J. De Nayerlaan 5, B-2860 Sint-Katelijne-Waver, Belgium

Keywords: Split-disk test, Filament wound composites, Strain measurement, Digital image correlation

149. NUMERICAL STUDY ON EFFECT OF FIBRE MISALIGNMENT AND VARIATION OF COHESIVE PROPERTIES ON FIBRE/MATRIX DEBONDING

Pavel Druzhinin1,2, Qiang Liu3, Stepan V. Lomov2,3 and Dirk Vandepitte1

1Department of Mechanical Engineering, KU Leuven, Celestijnenlaan 300 bus 2420, 3001 Leuven, Belgium
2SIM vzw, Technologiepark 935, B-9052 Zwijnaarde, Belgium
3Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 bus 2450, 3001 Leuven, Belgium

Keywords: Variability of fibre reinforced composites, Representative volume element, Embedded region, Cohesive zone, Parametric study

150. SYNERGIES IN THE FINAL FAILURE OF THIN PLY COMPOSITES: NEW MODELLING INSIGHTS TO EXPLAIN THE EXPERIMENTAL OBSERVATIONS

Yentl Swolfs1

1Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 box 2450, 3001 Leuven, Belgium

Keywords: Thin ply composites, synergetic effects, ultimate tensile strength

151. VARIATIONAL MODEL FOR PLY CRACKING IN MULTIPLE ORIENTATIONS IN GENERAL SYMMETRIC COMPOSITE LAMINATES WITH FULL HOMOGENIZATION OF DAMAGED INPLANE AND OUT-OF-PLANE PLY PROPERTIES

M. Hajikazemi1, I. Miskdjian1, D. Garoz1 and W. Van Paepegem1

1Department of Materials, Textiles and Chemical Engineering, Faculty of Engineering and Architecture, Ghent University, Technologiepark Zwijnaarde 46, Ghent, Belgium

Keywords: Ply cracking, Homogenization, Variational approach, Finite elements, Digital Image Correlation

152. MODE II FRACTURE ANALYSIS OF ANTISYMMETRIC LAMINATES BASED ON THE 4ENF SETUP AND J-INTEGRAL

Niels Pichler1, Charlie Blondeau1, Georgios Pappas1, Miguel Herráez1, John Botsis1

1Laboratory of Applied Mechanics and Reliability Analysis (LMAF-STI), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland

Keywords: Mode II, J-integral, Crack migration, Laminated composites, Numerical analysis

153. MODEL OF ELASTICITY OF A LAMINATED COMPOSITE WITH ANISOTROPIC HETEROMODULAR LAYERS

Alexander I. Oleinikov1, Tatyana A. Kuzmina2

1Central Aerohydrodynamic Institute, 1 Zhukovsky Street, Zhukovsky, Moscow Region, 140180, Russian Federation
2Moscow Institute of Physics and Technology, 16 Gagarin street, Zhukovsky, Moscow Region, 140180, Russian Federation

Keywords: Laminated composites, Bimodulus, Behavior elastic model, Stiffness, Compliance

154. A PHYSICALLY BASED APPROACH DEDICATED TO OPEN-HOLE STRENGTH WITH A NEW GENERATION MATERIAL

J. Germain1, J. Rannou1, F. Laurin1 and F. Congourdeau2

1ONERA/DMAS, Université Paris Saclay , F-92322 Châtillon – France
2Dassault Aviation, 78 Quai Marcel Dassault, 92210 Saint-Cloud – France

Keywords: damage, failure, open-hole, modelling, finite-element method

155. STUDY OF WATER DIFFUSION IN CARBON FIBER REINFORCED COMPOSITES FOR MARINE APPLICATIONS: MECHANICAL TESTING AND DIFFUSIONAL BEHAVIOR MODELLING

Haithem Bel Haj Frej1, Romain Léger1, Didier Perrin1 and Patrick Ienny1

1IMT Mines Alès, Centre des Matériaux des Mines d’Alès, 6 avenue de Clavières, 30319 Alès

Keywords: Composites, marine environment, durability, diffusion, thermoplastic

156. EXACT EXPRESSIONS OF CRACK FACE SLIDING DISPLACEMENT (CSD) FOR INPLANE ELASTIC CONSTANTS OF SYMMETRIC DAMAGED LAMINATES

Mohamed Sahbi Loukil1,2and Janis Varna3

1RISE SICOMP, Box 271, SE-94129, Piteå, Sweden
2Division of Engineering Materials, Linköping University, 581 83 Linköping
3Division of Materials Science, Luleå University of Technology SE-97187 Luleå, Sweden

Keywords: Crack Sliding displacement (CSD), FEM, Transverse cracks

158. MATRIX AND INTERFACE CRACKING IN CROSS-PLIED MULTIFUNCTIONAL STRUCTURAL COMPOSITE MICRO-BATTERY

Johanna Xu1

1Department of Industrial and Materials Science, Chalmers University of Technology, SE-41296 Göteborg, Sweden

Keywords: Multifunctional composites, micro-battery, Finite elements, microdamage, debonds

159. REAL-TIME DIGITAL IMAGE CORRELATION APPLICATIONS TO COMPOSITE MECHANICAL TESTING

Victor Couty1, Eric Deletombe2, Julien Berthe2, Jean-François Witz1, Pauline Lecomte-Grosbras1 and Mathias Brieu3

1Univ. Lille, CNRS, Centrale Lille, FRE 2016 – LaMcube – Laboratoire de mécanique multiphysique multiéchelle, F-59000, Lille, France
2ONERA Lille, 5 rue des Fortifications, 59045 Lille, France
33Department of Mechanical Engineering, California State University-Los Angeles, 5151 State University Drive, Los Angeles, United States

Keywords: Digital Image Correlation, Proper Orthogonal Decomposition, Finite Elements, Identification, Multiaxial testing

160. PLY-THICKNESS EFFECT ON FIBER-MATRIX INTERFACE CRACK GROWTH

Luca Di Stasio1,2, Janis Varna1 and Zoubir Ayadi2

1Luleå University of Technology, University Campus, SE-97187 Luleå, Sweden
2Université de Lorraine, EEIGM, 6 Rue Bastien Lepage, F-54010 Nancy, France

Keywords: Polymer matrix composites, Debonding, Ply-thickness effect, Fracture mechanics

161. A REVIEW OF STRATEGIES FOR LOWERING STRESS CONCENTRATIONS DURING TENSILE TESTING OF COMPOSITE MATERIALS

Babak Fazlali1, Stepan V. Lomov1 and Yentl Swolfs1

1Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 box 2450, 3001 Leuven, Belgium

Keywords: Unidirectional composites, Geometry effects, Tensile test, Tension-Tension Fatigue

162. EXPERIMENTAL INVESTIGATION OF DAMAGE FORMATION IN THIN-PLY COMPOSITES

Konstantinos Giannadakis1, Mohamed Sahbi Loukil1,2 and Florence Rinn3

1RISE SICOMP, Bröderna Ugglas Gata, Hus 208, Linköping, Sweden
2Linköping University, Division of Engineering Materials, 581 83 Linköping
3Oxeon AB, Företagsgatan 24, 504 64 Borås, Sweden

Keywords: Polymer composites, Digital Image Correlation, Mechanical properties, Finite elements

163. TIME-DEPENDENT PROPERTIES OF GRAPHENE REINFORCED HDPE

Zainab Al-Maqdasi1, Liva Pupure1, Nazanin Emami1 and Roberts Joffe1

1Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden

Keywords: Graphene nano-platelets, Polymer nano-composites, Viscoplasticity, Modelling

164. MICRO-DAMAGE ANALYSIS IN THIN-PLY LAMINATES FOR CRYOGENIC APPLICATIONS

Andrejs Pupurs1, Mohamed Sahbi Loukil2, David Mattsson2

1Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
2RISE SICOMP, Box 271, SE-94129, Piteå, Sweden

Keywords: Thin-ply laminates, Transverse cracking, Cryogenic temperature, Weibull strength

165. EFFECT OF DEGREE OF CURE ON NON-LINEAR BEHAVIOUR OF POLYMERIC MATERIALS

Liva Pupure1, Sibin Saseendran2, Janis Varna1

1Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
2RISE SICOMP, Box 271, SE-94129, Piteå, Sweden

Keywords: Degree of Cure, nonlinearity, viscoplasticity, viscoelasticity

166. STRESSES IN DOUBLE-LAP ADHESIVE JOINT ANALYSED BY USE OF NUMERICAL MODEL WITH SPECIAL BOUNDARY CONDITIONS AND MATERIAL NON-LINEARITY

Nawres J. Al-Ramahi1,2, Roberts Joffe1 and Janis Varna1

1Division of Materials Science, Luleå University of Technology, SE-971 87 Luleå, Sweden
2Institute of Technology / Baghdad, Middle Technical University, Baghdad, Iraq

Keywords: Composites, Double-lap joint, Adhesive joints, Stress distribution, Finite element method

167. EFFECT OF LOCAL DELAMINATIONS ON THE IN-PLANE STIFFNESS OF CROSS-PLY LAMINATES

H. Ben Kahla1 and Janis Varna1

1Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden

Keywords: Intralaminar cracks, Local delamination, COD, FEM