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排序方式: 共有535条查询结果,搜索用时 31 毫秒
1.
G. M. Kulikov S. V. Plotnikova 《International journal for numerical methods in engineering》2002,55(10):1167-1183
The precise representation of rigid body motions in the displacement patterns of curved Timoshenko–Mindlin (TM) shell elements is considered. This consideration requires the development of the strain–displacement relationships of the TM shell theory with regard to their consistency with the rigid body motions. For this purpose a refined TM theory of multilayered anisotropic shells is elaborated. The effects of transverse shear deformation and bending‐extension coupling are included. The fundamental unknowns consist of five displacements and eight strains of the face surfaces of the shell, and eight stress resultants. On the basis of this theory the simple and efficient mixed models are developed. The elemental arrays are derived using the Hu–Washizu mixed variational principle. Numerical results are presented to demonstrate the high accuracy and effectiveness of the developed 4‐node shell elements and to compare their performance with other finite elements reported in the literature. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
2.
A. A. Malkov E. A. Sosnov A. A. Malygin N. A. Kulikov G. L. Brusilovsky E. G. Kalinikos 《Glass Physics and Chemistry》2006,32(1):70-74
The formation of a defect-free continuous titanium oxide coating on the surface of borosilicate glass in the course of synthesis by the molecular layering method is revealed using atomic-force microscopy. This coating ensures a significant decrease in the roughness of the initial surface. 相似文献
3.
E. M. Tonkopii G. B. Manelis S. V. Kulikov 《Combustion, Explosion, and Shock Waves》1993,29(3):382-384
A model is proposed for infiltration combustion, which incorporates the reaction kinetics more fully. Calculations have been performed on a multicomponent system with complicated kinetics, which show that the kinetic parameters have a marked effect on the basic working ones. It has been shown by varying the water-air ratio for wet combustion that the completeness of the conversion of the fuel increases with the initial water concentration, and that the speed of the combustion front and the combustion temperature increase.Chernogolovka. Translated from Fizika Goreniya i Vzryva, Vol. 29, No. 3, pp. 136–139, May–June, 1993. 相似文献
4.
The structure of steel 14Kh17N2 after quenching exhibits -phase (ferrite alloyed with chromium and nickel), which causes the formation of streaks, filaments, and other defects in the metal during rolling and hot pressure treatment. The properties of the microstructure of this steel can be judged by the state of the carbide phase segregating on phase interfaces and inside grains. A complex analysis of the changes in the state of the carbide phase M23C6 in the process of high-temperature tempering of steel 14Kh17N2 (for example, at 700°C is of practical interest. The results of this analysis make it possible to make recommendations on improvement of the properties of the steel and to refine the optimum chemical and phase compositions.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5 , pp. 36–38, May, 1995. 相似文献
5.
V. B. Kulikov 《Semiconductors》2012,46(9):1158-1162
The temperature dependences of the dark current of quantum-well infrared photodetectors are investigated experimentally. It is established that the pre-exponential factor in the analytical expression for the photodetector current-voltage characteristics varies linearly with temperature. On the basis of the results obtained, it is suggested that the temperature dependence of the photodetector??s dark current is determined by the thermal excitation of charge carriers to a band characterized by a two-dimensional density of states. In the context of this suggestion, a refined model for the current-voltage characteristics is proposed. The model takes into account the thermal generation of charge carriers in a band with a two-dimensional density of states and the electric field dependence of the thermal activation energy for the quantum-well ground state and of the drift velocity of the carriers in the barrier conduction band. 相似文献
6.
The paper is focused on studies of channel viscous flow stability with the high dependence viscosity on temperature (thermoviscosity effect). It is shown the essential influence of this effect on the entrance length or transition from any initial profile to the stationary profile of the plane channel flow. The obtained solution has an inflection point in the velocity profile for the certain range of flow parameters. This evidence with respect to Rayleigh’s inflection theorem involves thermoviscous media deserving consideration objects for stability problems. 相似文献
7.
An optoelectronic method of contactless reconstruction of the surface profile of complexly shaped threedimensional objects
with the use of structured light, phase triangulation, and a steady-state method of identification of interference patterns
by means of stepwise shift is considered. Analytic estimates as well as estimates obtained experimentally (using the newly
developed measurement system) of the error in measurements of surface profile with the use of the proposed method are presented. 相似文献
8.
Kulikov V. Yu. Aubakirov D. R. Kvon S. S. Dostaeva A. M. Shcherbakova E. P. 《Metallurgist》2019,62(9-10):1068-1072
Metallurgist - We provide an overview of requirements for wear-resistant materials in the Kazakhstani ore mining and smelting industry, and describe the basic variety of metallurgical parts and... 相似文献
9.
10.
A. P. Kulikov M. V. Sharygin P. V. Ilyushin 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2020,53(5):611-617
New relay protection algorithms have become necessary because of the special features of microgrid regimes with distributed power generation sources. The a 相似文献