Localized Plastic Deformation of Metal-Intermetallic Laminated Composites after Equal Channel Angular Pressing

Russian Physics Journal - The paper presents mathematical simulation of localized plastic deformation of metal-intermetallic laminated composites after equal channel angular pressing. Deformation...     

Modeling of Plastic Flow Localization and Crack Formation in Dynamic Channel Angular Pressing

Russian Physics Journal - The paper studies the phenomenon of localized-deformation macrobands and crack formation in metal alloys under dynamic channel-angular pressing. The numerical calculations...     

Microdistributions in a diatomic monolayer on the surface

The regularities of the arrangement of atoms of two types on a surface are considered within the framework of a one-dimensional model taking only the interaction between the nearest neighbors into account. Exact relations determining the probabilities of the appearance of all possible atomic configurations are introduced to simplify the form of the interaction on the basis of the notion of detailed equilibrium. A considerable variety of microdistribution regularities in the structure is established; it is determined by the main characteristics of the components and by the temperature. The conditions for the appearance of dense atomic chains, including those with regular alternation of atoms of the two types, are determined. The possibilities of the appearance of small clusters randomly distributed in a relatively homogeneous medium are indicated. The results of the constructions are discussed.     

Modeling of macroscopic strain localization in alloys with the <Emphasis Type="Italic">L</Emphasis>1<Subscript>2</Subscript> structure

Results of mathematical modeling of plastic strain superlocalization are presented with allowance for dislocation redistribution into dislocation walls. The model based on the concept of hardening and rest is used to construct equations describing kinetics of dislocations and substructure transformations. It is demonstrated that depending on the scenario of the strain model evolution in the microvolume of a deformable body, different types of localization are possible under the influence of stress concentrators.     

Mathematical Modeling of Deformation and Fracture of Cermets under Dynamic Loading Conditions

The behavior of cermets under shock-wave loading conditions is examined. The materials under study are produced by self-propagating high-temperature synthesis. A mathematical model for calculating the stress-strain state and fracture of the TiB + B₄C-based cermet is developed.     

Optimization of Linear Functions at the Vertices of a Permutation Polyhedron with Additional Linear Constraints

We propose an approximate polynomial method that enables one to determine with given accuracy the extremum of a function on a permutation polyhedron with additional linear constraints.