共查询到20条相似文献,搜索用时 15 毫秒
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P. G. Babaevskii A. R. Bel'nik N. Ya. Babaevskaya N. S. Zhukova S. L. Roginskii 《Mechanics of Composite Materials》1988,23(5):572-579
Conclusion The tendency of disperse mineral fillers toward aggregation, with the formation of a continuous framework of particles, when filler content is greater than the SCC is manifest in a sharp increase in the difference between the relative viscosity of polyester binder-pastes in the uncured state and the relative elastic modulus in the cured state. It is also manifest in an increase in the relative modulus and a reduction in crack growth energy in cured composites. In this case, there is an especially large increase in the size of the characteristic defect, which ultimately determines the reduction in the breaking stress. The modification of binder-pastes with surfactants increases filler dispersion and makes it possible to increase the strength of cured composites.Presented at the Sixth All-Union Conference on the Mechanics of Polymer and Composite Materials (Riga, November, 1986).Translated from Mekhanika Kompozitnykh Materialov, No. 5, pp. 819–824, September–October, 1987. 相似文献
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By investigating the effect of various powdered oxides on network formation in phenolformaldehyde oligomers, it has been established that nonionogenic oxides increase the number of network defects in proportion to the surface energy of the powder. Small amounts of ionogenic oxides with a divalent cation cause the formation of new ionic or ionic-coordination linkages in the polymer network. The effect of mineral powders on polymer network formation is correlated with the mechanical properties of molding materials based on phenol-formaldehyde polymers with different network densities.Moscow Aviation Technological Institute. Translated from Mekhanika Polimerov, Vol. 4, No. 6, pp. 1033–1042, November–December, 1968. 相似文献
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L. A. Sukhareva V. A. Voronkov P. V. Godilo V. V. Paturoev P. I. Zubov 《Mechanics of Composite Materials》1968,4(4-6):908-912
The mechanism of coating formation from solutions of atactic polystyrene in xylene and carbon tetrachloride has been investigated. It has been established that, as the filler content increases, in coatings formed from polystyrene solutions containing an evaporating solvent the growth of the internal stresses and the thermophysical characteristics is characterized by similarity of slope, as distinct from the case of coatings obtained from systems containing a polymerizing solvent. It is shown that the nature of the solvent has an important effect on the character of the interaction at the polymer—filler interface and on the structure and properties of the coatings.Kucherenko Central Scientific-Research Institute of Structural Design. Institute of Physical Chemistry, AS USSR, Moscow. Translated from Mekhanika Polimerov, Vol. 4, No. 6, pp. 1127–1129, November–December, 1968. 相似文献
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E. B. Trostyanskaya A. M. Poimanov E. F. Nosov A. R. Bel'nik 《Mechanics of Composite Materials》1969,5(6):905-909
The elastic (modulus of elasticity and equilibrium high-elastic modulus) and thermal (volume coefficients of thermal expansion below and above the glass transition temperature) properties of compositions based on ÉD-5 epoxy resin cured with polyethylenepolyamine have been investigated. Quartz powder and aluminoborosilicate glass powder were employed as fillers at concentrations from 0 to 0.413. The thermal expansion coefficients of the compositions were studied in a dilatometer, in which the specimen is free of mechanical loads. The Young's modulus at 25°C and the equilibrium high-elastic modulus at 125°C of the compositions were determined in the compression regime in an instrument based on the IZV-2 optical length gage. The thermal expansion coefficients of the polymer matrix were calculated with allowance for the elastic properties of the resin and the filler. It is shown that, as the filler concentration increases, the thermal and elastic properties of the resin in the filled system change. This can be interpreted as a change in the properties of the resin as it approaches the surface of the filler particles. Increased interaction between the filler surface and the epoxy resin tends to stiffen the polymer network.Scientific Research Institute of Precision Technology, Moscow. Translated from Mekhanika Polimerov, No. 6, pp. 1018–1022, November–December, 1969. 相似文献
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A. M. Poimanov E. B. Trostyanskaya E. F. Nosov A. R. Bel'nik 《Mechanics of Composite Materials》1970,6(1):46-49
It is shown for the first time that the increased strength of filled plastics is associated with an increase of the internal pressure in the resin determined by the nature of the filler surface and the curing conditions.For communication 1, see [1].Moscow. Translated from Mekhanika Polimerov, No. 1, pp. 54–58, January–February, 1970. 相似文献
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Yu. N. Rabotnov S. A. Kolesnikov V. S. Matitsyn I. M. Makhmutov V. A. Rudenko E. I. Stepanychev 《Mechanics of Composite Materials》1976,12(2):202-207
The effect of reinforcement schemes that differ in the magnitude of the disorientation angle of neighboring filler layers on the mechanical properties of a "carbon-carbon" composite under extension, compression, or bending is shown.Translated from Mekhanika Polimerov, No. 2, pp. 235–240, March–April, 1976. 相似文献
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For a consistent lightweight design the consideration of the nonlinear macroscopic material behaviour of composites, which is amongst others driven by damage and strain-rate effects on the mesoscale, is required. Therefore, a modelling approach using numerical homogenization techniques is applied to predict the effective nonlinear material behaviour of the composite based on the finite element simulation of a representative volume element (RVE). In this RVE suitable constitutive relations account for the material behaviour of each constituents. While the reinforcing glass fibres are assumed to remain linear elastic, a viscoplastic constitutive law is applied to represent the strain-rate dependent, inelastic deformation of the matrix material. In order to analyse the influence of the nonlinear matrix material behaviour on the global mechanical response of the composite, effective stress-strain-curves are computed for different load cases and compared to experimental observations. (© 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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Igor V. Andrianov Vladyslav V. Danishevs’kyy Dieter Weichert 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》2008,59(5):889-903
Improved bounds for effective transport properties of a random non-percolated composite with cylindrical fibres are developed
by means of the security-spheres approach. The key point of the method is to obtain a solution for a regular composite that
can be valid for all values of the volume fractions and properties of the components. For this aim we use the asymptotic homogenization
method; a cell problem is solved by a modified version of the boundary shape perturbation technique.
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Igor V. Andrianov Vladyslav V. Danishevs’kyy Dieter Weichert 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》2008,159(1):889-903
Improved bounds for effective transport properties of a random non-percolated composite with cylindrical fibres are developed
by means of the security-spheres approach. The key point of the method is to obtain a solution for a regular composite that
can be valid for all values of the volume fractions and properties of the components. For this aim we use the asymptotic homogenization
method; a cell problem is solved by a modified version of the boundary shape perturbation technique. 相似文献