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The flattening and loss of stability of a nonlinear viscoelastic ring at various initial eccentricities is investigated with due allowance for instantaneous, nonlinear deformations.Scientific-Research Institute of Mechanics, M. V. Lomonosov State University, Moscow. Translated from Mekhanika Polimerov, No. 6, 1073–1080, November–December, 1972.  相似文献   
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The buckling and loss of stability of a rod made from a nonlinear viscous-elastic polymer material are studied with due allowance for instantaneous nonlinear strains. The case of a hinge-fixed rod is considered for various initial deflections.Scientific-Research Institute of Mechanics of the M. V. Lomonosov Moscow State University. Translated from Mekhanika Polimerov, No. 1, pp. 98–104, January–February, 1972.  相似文献   
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In the mechanics of deformed solids it is usually assumed that superposing small amplitude vibrations on a static load has no effect on the over-all characteristics of a material under strain. This hypothesis is reflected in the fact that the existing equations of state for the case of static loads with superposed small vibrations give deformation characteristics which differ little from the corresponding parameters of deformation processes taking place in the absence of excitations. At the same time, substantial changes in the deformation characteristics of a number of materials are observed under certain conditions after the application of alternating stresses of small amplitude. Reports on studies of creep of metals [1, 2], elastomers [3], and concrete [4] have been published, in which the fatigue curves obtained with small vibrations superposed on static loads lie above curves obtained for static loads corresponding to the maximum pulsating load level. Attempts have been made to explain this effect from the standpoint of the molecular-kinetic [3] and phenomenological [5] theories. Certain theoretical considerations and experimental data, discussed in this article, show that superposing a small dynamic component on a static load leads to an increase in the rate of creep of several polymer materials. This effect, which is due mainly to an increase in the polymer temperature as a result of dissipation of vibrational energy, differs from the vibration effect observed on elastomers by Slonimskii and Alekseev [3], in which the temperature rise due to the heat generated by vibrations plays no substantial part.The authors thank V. A. Volodchenkova, N. I. Gal'china, Yu. S. Levshina, Yu. P. Maksimacheva, and V. V. Tikhomirova who participated in the experimental work.  相似文献   
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Stability in the presence of creep has been studied by different authors; some of these investigations were made as much as ten years ago.

The majority of the published papers are concerned with problems of the stability of longitudinally compressed rods, since this represents the simplest formulation of the problem by which many of the particular characteristics of stability can be elucidated.

It has to be noted that there exists a series of principally different formulations of the problems of stability in the presence of creep. In this paper, consideration will be restricted to stability of rectilinear forms of equilibrium.  相似文献   

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The formation of pulses of surface electromagnetic waves at a metal–dielectric boundary is considered in the process of cooperative decay of excitons of quantum dots distributed near a metal surface in a dielectric layer. It is shown that the efficiency of exciton energy transfer to excited plasmons can, in principle, be increased by selecting the dielectric material with specified values of the complex permittivity. It is found that in the mean field approximation, the semiclassical model of formation of plasmon pulses in the system under study is reduced to the pendulum equation with the additional term of nonlinear losses.  相似文献   
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Russian Physics Journal - This paper presents the technology of fabrication of T-shaped gates for GaAs transistors using optical lithography and a unique method of directional angular deposition of...  相似文献   
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Linear-fractional strain rate and stress relations are used to simulate materials undergoing steady state creep. The crack tip asymptotic character of the stress and strain rate field is obtained in exact and approximate form. In the limit as the radial distance emanating from the crack tip approaches zero, the stress field corresponds to that for an ideal plastic material while the exact and approximate solutions tend to coincide. Discussed is the nonhomogeneous singular character of the strain rate field that possess different orders of singularities in a circular region around the crack tip.  相似文献   
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