Geodesic
Flow of Slibar--Paslay material in a~flat channel
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 12 (2012) no. 1, pp. 80-88.

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The question of the numerical simulation of unstable flow of a viscoplastic material in a flat channel is considered. Defining relations are taken in the form of Slibar–Paslay. The problem is solved in stresses. Theorem about the weak discontinuity at the interfaces between rigid and viscoplastic zones is proved. The original numerical method for solving the problem is offered. Numerical simulation results are presented. 
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N. A. Okulov. Flow of Slibar--Paslay material in a~flat channel. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 12 (2012) no. 1, pp. 80-88. http://geodesic.mathdoc.fr/item/ISU_2012_12_1_a11/

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[5] Okulov N. A., “Uprugii udar po vyazkoplasticheskomu sterzhnyu”, Vychisl. mekh. splosh. sred, 4:2 (2011), 96–109