COMPUTER MODELLING OF ELASTIC-PLASTIC DEFORMATION OF POWDER POROUS MATERIALS UNDER PRESSURE TREATMENT

Gorokhov V.M., D.Sc. in Eng., the Institute of Powder Metallurgy of the NAS of Belarus

There have been obtained physical and mathematical models for irreversible forging of powder materials to get structural machine parts. The constitutive equations for determination stresses strain rates and density inside a volume of porous body taking into account elasticity and plasticity have been derived. There have been represented different applications of the elastic-plastic model for computer modelling of calculating powder porous composite materials under external loading in a rigid die.

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• Gorokhov V.M., . Tarusov I.N., Ustinova G.P. Modelirovanie uplotnenija poroshkovyh materialov na osnove vol'frama s razlichnym soderzhaniem medi [Simulation compacting powder materials based on tungsten with different contents of copper]. Poroshkovajametallurgija [Powder metallurgy], 2005, no. 28, pp. 44-50.
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THE POLYMER MELTS RHEOLOGY PECULIARITIES

Naumenko A.S., Special Design-Engineering Bureau “Mashpriborplastik”, Kharkov, Ukraine

Rheological equation of the line polydisperse polymer in the one-dimensional asymptotic approximation is offered using statistical method to describe the melt shear flow process. The physical content of its basic characteristics is determined. The rheological equation allows explaining rather broad range of the experimentally stated peculiarities of the polymer melt shift flow.

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FEATURES OF TECHNOLOGY AND THE EQUIPMENT FOR DYNAMIC STABILIZATION OF FRICTIONAL DISKS OF MULTIDISK COOLED BRAKES

Antonyuk V.E., D.Sc. in Eng., the Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, the Republik of Belarus

Dovnar S.S., Ph.D. in Eng., the Belarusian National Technical University, Minsk

Rudyy V.V., Ph.D. in Eng., the Belarusian National Technical University, Minsk

Turomsha V.I., Belarusian Automobile Plant, Zhodino

Recommendations for use of operation of dynamic stabilization are given by development of technological process of manufacturing of frictional disks of multidisk brakes of dumpers of the big carrying capacity up to 240 tons. Results of research with use of a method of final elements of the intense condition of frictional disks of big diameters up to 1000 mm are resulted at realization of process of dynamic stabilization. On the basis of the received results the description of a design of installation for realization of process of dynamic stabilization of frictional disks is given.

• Antonyuk V.E. Vybor konstrukcionnyh parametrov i sovershenstvovanie tehnologii izgotovlenija frikcionnyh diskov [Selection of design parameters and improvement of production technology of friction discs]. Traktory i s.-h. mashiny [Tractors and agricultural machinery], 2005, no. 7, pp. 45-47.
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• Antonyuk V.E. Dinamicheskaja stabilizacija geometricheskih parametrov detalej znakoperemennym nagruzheniem [Dynamic stabilization of the geometric parameters of parts alternating loading]. Minsk, Tehnoprint, 2004. 184 p.
• Antonyuk V.E., Goman A.M., Aleksandrova V.S. Raschet naprjazhennogo sostojanija detalej tipa kolec pri sovmestnom dejstvii izgiba i kruchenija [Calculation of stress state such as rings parts under the combined action of bending and torsion]. Materialy, tehnologii, instrumenty [Materials, technologies and tools], 2006, vol. 11, no. 2, pp. pp. 32-38.
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INFLUENCE OF GAS MOLECULES SIZE ON THEIR DIFFUSION IN CROSS-LINKED POLYETHYLENE

Khalikov R.M., Ph.D. in Chem. Sc., M.Akmullah Bashkir State Pedagogical University, Ufa, Russia

Shustov G.B., Ph.D. in Chem., Kabardino-Balkarian State University, Nalchik, Russia

Kozlov G.V., Kabardino-Balkarian State University, Nalchik, Russia

It is shown, that the diffusivity reduction at polymer cross-linked is due to drift of gas-diffusant molecules on cross-wise links. A gas molecule diameter raising result to change of effective structural characteristics of cross-linked polymer, that more intensifies this effect.

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