Monolayer properties identification in carbon composite with nano-modified matrix

Metallurgy and Material Science

Material science


Аuthors

Kyaw A. L.1*, Artemev A. V.1, Rabinsky L. N.1**, Afanas'ev A. V.2, Semenov N. A.3, Solyaev Y. O.4***

1. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
2. Nanotechnology Centre of Composites, NCC, 42, bld. 5, Volgogradsky av., Moscow, Russia, 109316
3. Institute of Applied Mechanics of Russian Academy of Science, IAM RAS, 32a, Leninskii av., Moscow, В-334, GSP-1, 119991, Russia
4. Institute of Applied Mechanics of Russian Academy of Science, IPRIM RAS, 7, Leningradskiy Prospekt, Moscow, 125040, Russia

*e-mail: kyawaung@mail.ru
**e-mail: f9_dec@mai.ru
***e-mail: yos@iam.ras.ru

Abstract

The results of monolayer elastic and thermos-elastic characteristics identification in carbon composite samples, produced by employing of epoxy matrix containing 0.2 wt.% of fullerene soot are presented. The composite samples with reinforcing schemes [02/904/02], [+452/-454/+452], [04], [904] were fabricated by vacuum shaping. The fullerene soot was preliminary added to a binder and disperse using mechanical and ultrasonic mixing.

The composite monolayer properties were obtained based on the analysis of the results of mechanical tests of the samples with various reinforcing schemes and inverse problem solution. The multilayer properties valuations were obtained, using micro-mechanical, analytical and numerical modeling and solving corresponding averaging problems. Mori-Tanaka averaging method was used for analytical computations for cylindrical embedding problem. Numerical calculations were performed using finite elements method at representative fragments, containing unidirectional fibers. The computations used initial matrix properties values obtained from the experiments, and matrix containing the fullerene soot.

The paper demonstrates that the results of numerical and analytical computations performed to evaluate the unidirectional layer properties are sufficiently close to each other. It follows from these computations that in case of impurities agglomeration, addition of nano-filler should lead in the first place to transverse elastic modulus increase and monolayer shear modulus due to matrix tightening. Pitch module should vary insignificantly since it is defined by filler properties. With the filler addition, the monolayer Poisson ratio practically should not change. These results do not correspond with the experiment, except shear modulus increase. Unlike the predicted monolayer transverse elastic modulus increase, the experiments revealed its decrease. It follows from the experiments that monolayer Poisson ration significantly decreases, which was not predicted by computations. The obtained results demonstrated the matrix embrittlement while implementing the selected nano-modification technique and the necessity of either filler volume fraction decreasing, or changing the technique of its dispersing in the binder.

The authors plan to use identified values of composites' monolayers elastic and thermos-elastic characteristics hereafter to describe the residue stressed-deformed state of carbon composite construction elements to reveal the possibilities of reducing residual stresses and shrinkages in the structures with asymmetric reinforcing schemes, using matrixes containing carbon nanoparticles.

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Keywords:

carbon composite mechanical properties, monolayer, properties identification, mathematical modeling, nano-modification, composite strength, fullerene soot

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