Materials physics and mechanics

RAR RUS 1-7 7005573911 St.Petersburg State University Morozov N.F.

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS I.A. Ovid’ko И.А.

St.Petersburg, Russia

K-4577-2013 57384230400 St.Petersburg State University Petrov Yuri y.v.petrov@spbu.ru

St.Petersburg, Russia

113263 6701854079 0000-0001-9909-2950 Institute of Problems of Mechanical Engineering RAS Sheinerman Alexander

St.Petersburg, Russia

Generation and Coalescence of Nanocracks in the Course of Grain Boundary Sliding in Nanocrystalline Solids A criterion for the coalescence of grain boundary nanocracks, formed in nanocrystalline materials (NCMs) in the course of grain boundary sliding, into a catastrophic macrocrack is developed. Estimates of the NCM ultimate strength, which characterizes the formation of such a macrocrack, and its strain to failure, are made. It is shown that the ultimate strength of an NCM deformed through grain boundary sliding considerably increases with an increase in the misorientation angles of NCM grains. Nanocrystalline Solids Nanocracks Grain Boundary Sliding https://mpm.spbstu.ru/article/2009.10.1/ MPM_8_1_P01_RUS.pdf

RAR RUS 8-31 Morozov Saveliev Institute of Problems of Mechanical Engineering RAS Meshcheryakov Yu.I.

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS Zhigacheva

St.Petersburg, Russia

The CRISM “Prometey” Barakhtin

St.Petersburg, Russia

Vortex Model for Elastoplastic Flow at Shock Loading Phenomenological model for elastoplastic flow and slide destruction of the materials at low shock loading is suggested; the model is based on the qualitative analysis of experimental data and analytical estimates. The main idea of the model is the nucleation and growth of the plasticity centers in a form of local vortices in dynamic deformed environment. shock loading; elastoplastic flow; modeling https://mpm.spbstu.ru/article/2009.10.2/ MPM_8_1_P02_RUS.pdf

RAR RUS 32-64 Institute of Problems of Mechanics (RAS) Tomashevsky

St.Petersburg, Russia

Institute of Problems of Mechanics (RAS) Yakovlev

St.Petersburg, Russia

Coupled Problems of Mechanics and Chemical Physics in the Technology for Producing Composite Polymer Materials Power interaction of material points in conversion -thermal field is under investigation. On this basis of coupled thermo-chemical and mechanical-mathematical models describing all spectrum of phenomena related to forming composite materials with polymer matrix (PCM) and constructions of these materials are worked out. The problems of constructing and technological projects control and optimization ; modeling of post-technological behavior of PCM constructions ; problems of constructing PCM surfaces with specific surface energy gradient and t heir interaction with liquid medium are un addressed. mechanics; chemical physics; technology; composite polymer materials; conversion-thermal field; carrying capacity; control; structure; surface; resistance; liquid medium https://mpm.spbstu.ru/article/2009.10.3/ MPM_8_1_P03_RUS.pdf

RAR RUS 65-82 Institute of Problems of Mechanical Engineering RAS Bobylev S.V.

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS I.A. Ovid’ko И.А.

St.Petersburg, Russia

Nanograin Nucleation, Nanoscale Amorphization and Transformations of Disclinations in Deformed Nanomaterials Theoretical models are suggested which describe micromechanisms for stress- induced nucleation of nanoscale grains (nanograins) and nanoscale amorphization in deformed nanocrystalline materials. Within the models, nucleation of nanograins and nanoscale amorphization are initiated by plastic deformation and represent processes related to transformations of dipoles and quadrupoles of disclinations (rotational defects) at grain boundaries. The nanograin nucleation occurs through splitting and migration of grain boundaries containing disclination dipoles. The nanoscale amorphization is realized through transformations of disclination quadrupoles. It is shown that processes of nanograin nucleation in deformed nanocrystalline materials (in particular, nanocrystalline Al and nanoceramic α-Al2O3) as well as nanoscale amorphization in deformed nanocrystalline silicon are energetically favorable in certain ranges of their parameters and the external stress level. Nanocrystalline materials; Nanograins; Disclinations; Amorphization https://mpm.spbstu.ru/article/2009.10.4/ MPM_8_1_P04_RUS.pdf

RAR RUS 83-107 Institute of Problems of Mechanical Engineering RAS I.A. Ovid’ko И.А.

St.Petersburg, Russia

113263 6701854079 0000-0001-9909-2950 Institute of Problems of Mechanical Engineering RAS Sheinerman Alexander

St.Petersburg, Russia

Misfit Dislocations in Composite Nanowires A review of theoretical models and experimental data concerning the formation of misfit dislocations core.shell cylindrical nanowires is presented. The critical conditions for the formation of dislocations, disclinations and dislocation loops in composite nanowires are calculated. The geometric and structural parameters of core-shell cylindrical nanowires at which nanowires do not contain dislocations are revealed. nanowires dislocations defects https://mpm.spbstu.ru/article/2009.10.5/ MPM_8_1_P05_RUS.pdf