This paper examines the high-frequency magnetic properties of heterogeneous nanogranular composites (Co45Fe45Zr10)X(Al2O3)100-X, obtained by ion-beam sputtering of composite target on the sitallic substrates. It is shown that in the region of metallic phase concentrations from 32 to 42 at. % μ/ and μ// have high values, which are significantly higher than those of bulk composites of similar composition. As the composite layers approach the threshold, both the real and imaginary portions of the complex magnetic permeability decrease.
In this work, electrical properties of metal-dielectric nanocom-posites with amorphous structure and multilayer films based on them have been investigated. It is shown that the concentration dependences of the electrical resistance of the composites have a S-shaped form following from the model of percolation conduction theory with the threshold in the region of concentrations ~ 40-60 % in total of the metal component. Meth-ods for the preparation of heterogeneous nanosystems are also described.
Theoretical and experimental methods for obtaining and investigating effective thermomechanical characteristics - residual stresses and deformation in panels made of nanomodified materials with asymmetrical reinforcement scheme have been developed in this paper. The study of the residual stress-strain state of structural elements made of carbon plastic using the values of thermoelastic characteristics of composite monolayers identified on the basis of the developed methods meade it possible to reveal the possibility of reducing the residual stress-strain state in structures with asymmetric reinforcement schemes.
In this work a study of nanoindentation of the surface of epoxypolyester-based powder coatings deposited on steel substrates was carried out. The effect of the test method on the identifiable mechanical properties is investigated. The measurement results obtained by using a spherical indenter and a Berkovich indenter are compared. Estimates of reduced modulus of elasticity, Young's modulus and rigidity of coatings are obtained. The experimental data obtained indicate a significant dependence of the determined mechanical properties of the paint and varnish coatings depending on the type of indenter used. In the case of Berkovich indenter, the Young's modulus of coatings (0.6 GPa) is understated in relation to coating properties known from macro experiments (3 GPa). Using a spherical indenter, Young's modulus is overestimated (6.3 GPa).
In this paper experimental and computational results obtained by numerical simulation of uniaxial tension of 0.7 mm thick metal plate specimens are compared. The Digimat-FE (MSC) system was used for modelling, which in numerical calculations uses the finite element solver of the Marc (MSC) software package. It is shown that for specimens without coatings the found theoretical values of critical load correspond quite well to the points on the experimental diagrams, at which the dependence of load and displacement ceases to be linear. For coated specimens, the critical loads turn out to be considerably lower, and for their description, it is necessary to obtain a refined estimate taking into account the action of residual stresses.
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