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A micro-computed tomography technique to study the quality of fibre optics embedded in composite materials Vrije Universiteit Brussel Universiteit Gent
Quality of embedment of optical fibre sensors in carbon fibre-reinforced polymers plays an important role in the resultant properties of the composite, as well as for the correct monitoring of the structure. Therefore, availability of a tool able to check the optical fibre sensor-composite interaction becomes essential. High-resolution 3D X-ray Micro-Computed Tomography, or Micro-CT, is a relatively new non-destructive inspection technique which ...
X-ray micro-computed-tomography characterization of cracks induced by thermal cycling in non-crimp 3D orthogonal woven composite materials with porosity KU Leuven
© 2018 Elsevier Ltd This paper focuses on an experimental study of the thermal cycling behavior of a carbon fiber/epoxy matrix composite material reinforced with a non-crimp 3D orthogonal woven preform (3DNCOW). The aim is to characterize the damage mechanisms – i.e. matrix cracking – induced by thermal cycling thanks to X-ray micro-computed-tomography (µCT). Qualitative and quantitative descriptions of the morphology and the evolution of cracks ...
Creating innovative composite materials to enhance the kinetics of CO2 capture by hydroquinone clathrates KU Leuven
© 2017 Elsevier B.V. This study addresses both the preparation of a reactive medium composed of porous particles impregnated with hydroquinone (HQ), an organic compound capable of forming gas clathrates, and an evaluation of the kinetic performance of these composite materials for CO2 capture. Two types of porous silica particles of different sizes and pore diameters were tested. The porous particles were impregnated with HQ by a dry ...
Gas Phase Sensing of Alcohols by Metal Organic Framework-Polymer Composite Materials KU Leuven
Affinity layers play a crucial role in chemical sensors for the selective and sensitive detection of analytes. Here, we report the use of composite affinity layers containing Metal Organic Frameworks (MOFs) in a polymeric matrix for sensing purposes. Nanoparticles of NH2-MIL-53(Al) were dispersed in a Matrimid polymer matrix with different weight ratios (0-100 wt %) and drop-casted on planar capacitive transducer devices. These coated devices ...
Investigation of microstructure and tensile properties of porous natural coir fibre for use in composite materials KU Leuven
tNatural coir fibres are studied for use as reinforcement in composite materials. In order to efficiently usethe fibres and understand the composite properties, the microstructure and the mechanical propertiesof coir fibres are investigated in this study. X-ray microtomography in SEM (SEM-CT) and SEM imageanalysis are used to examine the fibre internal structure including the organisation of elementary fibres,microfibril angles and fibre ...
Stochastic multi-scale modelling of composite materials based on experimental data KU Leuven
ariability in textile composites is substantial. A full characterisation of the internal geometry supports material design and increases the reliability of numerical simulations. An approach is presented and tested to obtain a full statistical description of the internal structure of a carbon-epoxy 2/2 twill woven composite, produced using resin transfer moulding. In a first step experimental data are collected using micro-CT to characterise the ...
Residual strain measurements during the curing cycle of composite materials using polarization properties of in-fibre bragg gratings Universiteit Gent
Due to the anisotropic and non-homogeneous nature of their components, the manufacturing process of composite materials may cause the appearance of significant residual strains and stresses during the curing cycle. We propose to follow the evolution of the polarization dependent loss peaks (amplitude and wavelength) of fibre Bragg gratings during the manufacturing of the composite material to highlight the residual strains appearance and also ...
Influence of temperature on the identification of the elastic properties of composite materials Vrije Universiteit Brussel
Standard test methods for the determination of elastic engineering constants like, among others, tensile tests, bending tests, torsion tests, require test specimens in which the stress and strain distribution are homogeneous. Standard test methods have proven their validity to the engineering society already a long time. However, when applied to complex materials like composite materials, some limitations of standard test methods become clear. ...
3-D radar image processing methodology for non-destructive testing of aeronautics composite materials and structures Vrije Universiteit Brussel
Recently, there has been a significant interest in employing$nhigh frequency radar imagery for many industrial oriented and security$napplications. The quality control of aeronautics composite multi-layered$nmaterials and structures through Non-Destructive Testing (NDT) is the$nmain focus of this study. The main motivations for using this technology$nare: it allows penetration of most non-metal and non-polarized$nmaterials, it provides the ...