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EFFECT OF VOIDS ON INTERLAMINAR BEHAVIOUR OF CARBON/EPOXY COMPOSITES
Iryna Gagauz (University of Bristol) Luiz Kawashita (University of Bristol) Stephen Hallett (University of Bristol)
In this work an investigation of void influence on the interlaminar shear strength of carbon/epoxy composites was performed using void morphology analysis. The results are useful to understand the material behaviour and refine numerical models.
EFFECTS OF PROCESS-INDUCED FIBER BUNDLE WAVINESS ON THE MECHANICAL PROPERTIES OF CARBON FIBER REINFORCED THERMOPLASTIC COMPOSITES
Tomohiro Yokozeki (University of Tokyo) Kotaro Akakabe (University of Tokyo) Takahira Aoki (University of Tokyo) Akira Kobiki (IHI corporation)
This study experimentally investigates the quantitative measurement of fiber bundle waviness in unidirectional CFRTP using the microscope and the X-ray CT scanning. Flexural strength deterioration is evaluated as a function of the waviness parameter.
INVESTIGATION INTO THE VARIABILITY OF CARBON FIBER NON-CRIMP FABRICS AND ITS INFLUENCE ON THE RTM-PROCESS
Andreas Nonn (BMW Group) Christian Koch (BMW Group) Thomas Maurer (BMW Group) Simon Bickerton (University of Auckland) Christoph Greb (RWTH Aachen Univeristy) Thomas Gries (RWTH Aachen University)
Unidirectional carbon fiber NCF single ply and stack properties are characterized non-destructively. The experimental results allow direct correlation of measured textile variability to flow front progression in 2D RTM short shot parts.
MODEL REDUCTION METHOD APPLIED TO 3D SIMULATION OF HONEYCOMB SANDWICHES WITH PARAMETRIZED GRADIENT OF PROPERTIES IN THE CORE
Brice Bognet (Ecole Centrale de Nantes) Francisco Chinesta (Ecole Centrale Nantes) Patrick De Luca (ESI Group)
We demonstrate in this paper how to solve a 3D elasticity problem defined on a honeycomb sandwich geometry, using the Proper Generalized Decomposition (PGD). Moreover two additional parameter are integrated in the simulation, making it 5D.
PROCESS-PARAMETER DEPENDENT SPRING-IN AND WARPAGE OF LOCALLY REINFORCED UD-TAPE LAMINATES AND V-SHAPED PROFILES
Benjamin Hangs (Fraunhofer ICT) Tobias Link (Fraunhofer ICT) Frank Henning (Fraunhofer ICT)
This study deals with thin-walled, locally reinforced laminates and V-shaped profiles made from thermoplastic UD tape. Process parameters are varied on three levels for both coupon types to investigate the influence on resulting shape deformations.
A PSEUDO DUCTILE ANGLE-PLY SUB-LAMINATE APPROACH FOR MULTIDIRECTIONAL THIN PLY CFRP LAMINATES
Jonathan Fuller (University of Bristol) Meisam Jalalvand (University of Bristol) Michael Wisnom (University of Bristol)
Analytical modelling of thin ply angle-ply CFRP laminates has shown that is possible achieve a pseudo ductile response with a [+-theta/0]_s layup. These layups are suggested as candidates for pseudo-ductile sub-laminates in multidirectional laminates.
ACOUSTIC EMISSION BASED METHOD TO CHARACTERISE THE DAMAGE MODES IN UD THIN CARBON/GLASS HYBRID LAMINATES
Mohamad Fotouhi (Amirkabir University of Technology) Putu Suwarta (University of Bristol) Meisam Jalalvand (University of Bristol) Gergely Czel (University of Bristol) Michael Wisnom (University of Bristol)
This paper investigates the relationship between the features of acoustic emission signals and the corresponding damage modes in S-Glass/carbon UD hybrid laminates. The generated results are useful to characterise damage modes in hybrid laminates.
ANALYSIS OF FAILURE MECHANISMS IN HYBRID CARBON FIBRE/SELF-REINFORCED POLYPROPYLENE COMPOSITES
Marina Selezneva (KU Leuven) Yentl Swolfs (KU Leuven) Tomoko Ichikawa (Toray) Ignaas Verpoest (KU Leuven) Larissa Gorbatikh (KU Leuven)
Pseudo-ductile hybrids that contain stiff but brittle webs of discontinuous carbon fibres, and tough but compliant plies of self-reinforced polypropylene were developed. Their tensile properties and failure mechanisms are described in this paper.
AVOIDING FREE EDGE DELAMINATION IN QUASI-ISOTROPIC PSEUDO-DUCTILE HYBRID LAMINATES – BY MATERIAL DISPERSION OR LAYER ANGLE DISPERSION?
Meisam Jalalvand (University of Bristol) Mohamad Fotouhi (Amirkabir University of Technology) Gergely Czel (University of Bristol) Michael Wisnom (University of Bristol)
Most hybrid material studies to date have been focused on Uni-Directional (UD) laminates. This paper presents two different strategies of hybridisation for multi-directional laminates and show which one is less susceptible to free-edge delamination.
DEMONSTRATION OF PSEUDO-DUCTILITY IN QUASI-ISOTROPIC LAMINATES COMPRISING THIN-PLY UD CARBON/EPOXY HYBRID SUB-LAMINATES
Gergely Czel (University of Bristol) Tamás Rév (University of Bristol) Meisam Jalalvand (University of Bristol) M. Fotouhi (University of Bristol) Michael Wisnom (University of Bristol)
Tensile response of QI hybrid laminates were studied. It was confirmed that the ply fragmentation mechanism can be transferred to multi-directional laminates. Notch-insensitivity was demonstrated by locally active ply fragmentation.
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