Non-Destructive Characterization of Nanocomposite Material Properties
International Conference "Functional Materials and Nanotechnologies" (FM&NT-2011): Book of Abstracts 2011
Pāvels Akišins, Miroslaw Wesolowski, Jevgenijs Barkanovs

Carbon nanotubes (CNT) and their mechanical properties have been closely investigated since the late 1990s. CNT have a Young’s modulus of 1 TPa, making them ideal reinforcements different composite materials and metallic alloys. Nowadays CNT-reinforced aluminium has promising perspectives for using in many industrial sectors such as aerospace, marine and land transport. Unfortunately the material data provided by manufacturers very often do not contain all necessary information to predict the behaviour of CNT-aluminium composite. Additionally, due to high costs of nanocomposites, their experimental testing using conventional fracture methods suffer from high expenses too. On this reason, non-destructive material properties characterization techniques have been adapted for small dimension samples testing. A static approach using three-point-bending test, and two dynamic methods, namely, impulse excitation method and an inverse procedure have been used. Tree-point-bending test allows to determinate the modulus of the material in terms of the measured centre deflection δ, applied load P and the geometry of a beam. In order to keep this approach non-destructive, this approach is only applicable for the elastic behavior of composite beams which can be obtained usually for strain less than 0.5%. Vibration test based on the impulse excitation is adopted for the determination of elastic properties of nanocomposite beams. Beam like specimens used for this method have specific resonant frequencies that are determined by the elastic modulus, material density, and geometry. Therefore the main requirement is to establish dimensions, density, and experimental fundamental flexural and torsional frequencies of a beam with free-free boundary conditions, so that the elastic properties can be computed. Used inverse technique uses vibration tests and consists of the experimental modal analysis, the numerical model and the material parameters identification procedure developed by applying a non-direct optimization method based on the planning of the experiments and a response surface method. Influence of CNT volume content on the CNT-aluminium composite strength and dissipative material properties is investigated in this work. Samples with CNT volume content of 0.0 to 1.0 % have been tested.


Atslēgas vārdi
Nanocomposites,non-destructive material

Akišins, P., Wesolowski, M., Barkanovs, J. Non-Destructive Characterization of Nanocomposite Material Properties. No: International Conference "Functional Materials and Nanotechnologies" (FM&NT-2011): Book of Abstracts, Latvija, Rīga, 5.-8. aprīlis, 2011. Rīga: Institute of Solid State Physics. University of Latvia, 2011, 190.-190.lpp. ISBN 978-9984-45-334-7.

Publikācijas valoda
English (en)
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