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| Ballóková B., Hvizdoš P., Besterci M., Scholl R., Böhm A. |
| CREEP CHARACTERISTICS OF MOSI2 BASED MATERIALS |
| Keywords: molybdenum disilicide|MoSi2 - SiC and MoSi2 - HfO2|creep behaviour|powder metallurgy|diffusion| |
| No 3 (2002), p. 235-240 |
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| Omar A.A., Hegazy M.M., Afifi S.E., Abdel Fattah A. |
| CHARACTERIZATION OF DIFFERENT ELECTROLYTIC IRON POWDERS |
| Keywords: iron powder|electrolysis|ferrous sulphate|particle size|particle shape|surface texture|apparent density|compressibility|sinterability| |
| No 3 (2002), p. 277-286 |
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| Veselovskiy V.B., Kochubey A.A., Syasev A.V., Mamuzych I., Klim E.A.V.G., Syasev V.A. |
| APPROXIMATE METHODS OF THE SOLUTION OF NON-LINEAR PROBLEMS THERMOMECANICS WITH DRIVING BORDER |
Abstract
The mathematical models are adduced and the methods of the solution one and multiphase problems of Stefan are offered. For construction of selfcontained problem solvings of Stefan the solutions of not characteristic Cauchy problem is used. The algorithm of the solution is shown to integrating a system of dace differential equations. The approximated analytical computational method of diphasic bodies is adduced, when the motion of a demarcation descends owing to thermoexchange by enviroment. The method allows with the help of a variational principle of Gibbs to determine tight - strained state in a body, temperature field and law of motion of a demarcation of phases. The model of calculation of thermoexchange agglamareted of iron-ore stuffs by the way of preforms of the spherical shape up to temperatures of optimum development of deoxidation processes by multicomponent gas is submitted. The model is constructed on the basis of multiphase problem of Stefan. The solution of a problem is obtained by a method of final differences.
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| Keywords: diphasic bodies|thermoexchange|heat conducting|law of moving of border| |
| No 3 (2002), p. 321-335 |
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