Multiscale model of deformed polycrystals. Hall-Petch problem

Numerical and Experimental Study of Strain Localization in Notched Specimens of a Ductile Steel on Meso‐ and Macroscales

“…Experimentally observed strain distribution patterns ( Figure 6) are generally consistent with the average value of the transverse strain component E yy shown in Figure 5c as well as with the behavior of the hardening coefficient @s/@e, Figure 6a, which shows that a pronounced fall in the @s/@e value and the increase in E yy commences at the strains larger than of 6%. According to physical mesomechanics, [6] the loss of shear stability of the specimen at the mesoscopic scale level should be accompanied by the formation of shear bands localized on a greater scale. This, in turn, excludes a large volume of the specimen from deformation process and thus reduces the work hardening rate.…”

“…It is quite evident nowadays that the cause-and-effect relations between various phenomena occurring in a deformed solid should be analyzed and interpreted through a multiscale description of underlying deformation/fracture processes. [6][7][8][9][10][11] A solid under external influence (mechanical, thermal, radiative loads, etc.) is considered as a multilevel hierarchically organized system, which experiences structural phase transformations at every scale.…”

“…is considered as a multilevel hierarchically organized system, which experiences structural phase transformations at every scale. [6,10,11] Thus, theoretically predicted and experimentally measured localized waves of plastic deformation result from complex self-organization of thermodynamic energy flows. [8][9][10] Multiscale consideration of loaded solids can be performed within the physical mesomechanics approach applied to materials where structural levels of deformation and fracture are related to each other through the hierarchy of scales.…”

Simulation of self-organization of mesoscopic plastic deformation of polycrystals

“…It is suggested that the origin and development of plastic deformation in a separate grain is characterized by two values of shear stress. The first value max defines the beginning of involvement of a grain into plastic deformation at max cr , where according to physical mesomechanics approaches [4,5] cr is controlled by structural phase transformations in planar grain boundary systems. Grain boundaries are sites where mobile deformation defects are generated and from where defects propagate into the crystallite.…”

Computer Simulation of Thermal Cycling of Porous Coatings: Hybrid Excitable Cellular Automata Method

“…Секция 3. Проблемы компьютерного конструирования материалов с иерархической структурой DOI: 10.17223/9785946217408/160 COMPUTER SIMULATION OF THERMAL CYCLING OF POROUS COATINGS: HYBRID EXCITABLE CELLULAR AUTOMATA METHOD 1 Moiseenko D.D., 1,2 Panin S.V., 1 Maksimov P.V., 1,2 Panin V.Е., 1,3 Babich D.S., 4 Thermal barrier coatings (TBC) are currently widely used to improve the heat resistance of critical parts, in particular cooled blades of gas turbine engines [1]. The thermal barrier coating deposited on the top of a high-temperature alloy substrate is typically a sandwich-like structure consisting of the i) metal substrate, ii) metallic bond coating, and iii) an outer ceramic layer with low thermal conductivity.…”