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11.
Deformation and temperature in the surface layer of plastic material and thickness of the plasticized layer are calculated using the one-dimensional macroscopic friction model developed in the first part of the paper [1]. We have studied the effect of sliding velocity, contact spot area, hardening ability, and thermal conductivity of material on the frictional heating and plastic deformation of the surface layer during a single touch between the contact spot and counterbody. Repeated contacts of the specimen and counterbody are simulated and the accumulation of plastic shear is considered for different contact spot sizes. 相似文献
12.
Sliding friction of materials differing in their deformation hardenability is simulated using a modified macroscopic model
which allows taking into account of frictional heating, as well as additional heat generation in the material surface layer
due to its plastic deformation. Taking into consideration additional heat generation is shown to have an effect on the heat
conditions and shear deformation in the surface layer when the deformation hardenability of the material falls within a certain
range. Comparative calculations performed with and without consideration of additional heat generation exemplify the quantitative
and qualitative differences of heating and plastic deformation of the surface layer. 相似文献
13.
A. V. Shcherbakov M. Ya. Pogrebisskii V. K. Dragunov V. P. Rubtsov A. L. Goncharov M. V. Ivashchenko A. S. Kozhechenko 《Russian Electrical Engineering》2016,87(9):541-548
A complex method for analyzing the processes in the systems of indirect cathode heating for electron- beam welding guns is proposed. The necessity of considering the electron-beam formation process in a cathode assembly with predetermined geometric characteristics is justified for calculating the distribution of the heat-flux density over the main-cathode surface. The typical distribution of the heat-flux density over the surface of the main cathode, which is heated via electron bombardment using a spiral wire heater, is analyzed. A method for calculating the temperature distribution over the structural elements of a typical cathode assembly is described, and the calculation results are analyzed. The influence of the nonuniformity of the electronbeam- current density distribution over the heated surface of the main cathode and the heat dissipation on the temperature and emission-current-density distributions on the working surface of the main cathode is considered. The advantages of the proposed method in comparison with existing idealized mathematical models and its suitability for solving problems of designing various electron guns are demonstrated. 相似文献
14.
Yu. I. Rubtsov A. I. Kazakov L. P. Andrienko G. B. Manelis 《Combustion, Explosion, and Shock Waves》1993,29(6):710-713
The kinetic behavior and temperature dependences of the rate constants for thermal decomposition are determined for cellulose
of different biological origins and forms. The possibility of thermal decomposition of cellulose in a combustion regime without
oxygen is analyzed.
Chernogolovka Institute of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka. Translated from Fizika Goreniya
i Vzryva, Vol. 29, No. 6, pp. 49–53, November–December, 1993. 相似文献
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The chromosomal complement was studied in 57 independent clones of hybrid cells obtained in six experiments for fusion of Chinese hamster and American mink cells. Various mink chromosomes in hybrids of concern are lost. It is shown when a small number of mink chromosomes are retained in hybrid clones, chromosomes 6, 9, 10, 12, 13, 14 and X segregate in a similar way and are preferentially retained in these clones. When a considerable number of mink chromosomes are detained in hybrid clones, the segregation mode is close to a random one. 相似文献