Materials physics and mechanics

RAR RUS 1-29 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

Aristotle University of Thessaloniki Aifantis E.C.

Thessaloniki, Greece

Mechanics of Crack Growth Processes in Nanoceramics A review of experimental data and theoretical models of fracture processes in homogeneous and nonhomogeneous nanocrystalline ceramics is presented. The key experimentally detected facts in this area are discussed. Special attention is paid to the theoretical models describing toughness enhancement in nanocrystalline ceramics. nanoceramics; cracks; fracture https://mpm.spbstu.ru/article/2011.18.1/ MPM_12_1_P01.pdf

RAR RUS 30-42 The CRISM “Prometey” Barakhtin

St.Petersburg, Russia

The CRISM “Prometey” Vargasov

St.Petersburg, Russia

The CRISM “Prometey” Nemec

St.Petersburg, Russia

The CRISM “Prometey” Khlusova

St.Petersburg, Russia

The Choice of the Thermomechanical Treatment Steels and Alloys Based on the Structural Systematic Analysis and the Imitation Modeling The regions of the positive correlations between dissipative function extreme characteristics and structure principal mechanisms were maintained. The results based on imitation hot pressure modeling and statistics generalizing with multifractal structure image analyzing at coordinates ε-Т. hot plastic deformation; optimization; dissipation; multifractal image analyze https://mpm.spbstu.ru/article/2011.18.2/ MPM_12_1_P02.pdf

RAR RUS 43-57 Guru Nanak Dev University Singh

India

Guru Nanak Dev University Singh

India

Electronic Stopping Power of Various Organic Compounds for Proton (0.05-10 MeV): a Comparative Study Electronic stopping power of various organic compounds for proton (0.05-10MeV) calculated using different theoretical and semi-empirical formulations has been analysed in the present investigation. The stopping power values calculated using Ashley's dielectric model (ADM) with evaluation approach for optical energy loss function (OELF) have been compared with the values computed using the theoretical formulation CasP (Convolution approximation for swift Particles) and semi-empirical approach SRIM (Stopping and Range of Ions in Matter). The merits and demerits of the adopted formulations are highlighted in the present energy region. These type of stopping power analyses for proton will be helpful for scientific community to choose best formulation. stopping power; stopping power codes; organic compounds https://mpm.spbstu.ru/article/2011.18.3/ MPM_12_1_P03.pdf

RAR RUS 58-63 Guru Nanak Dev University Singh

India

Guru Nanak Dev University Kaur

India

Guru Nanak Dev University Kaur

India

Guru Nanak Dev University Singh

India

Role of V2O5 in Structural Properties of V2O5-MnO2-PbO-B2O3 Glases Glass samples of compositions xV2O5-(20-x) MnO2-20PbO-60B2O3 with x varying from 0 to 15 % mole fraction are prepared by melt quench technique. The structural analysis of glasses is carried out by XRD, FTIR and density measurement techniques. The FTIR spectral studies have pointed out the conversion of structural units of BO3 to BO4 with the presence of VO4 and VO5 structural units of vanadium in these glasses. Due to the formation of BO4 groups, an increase in density from 3.52 to 4.33 g·Їcm-3 for MnO2-PbO-B2O3 glasses is observed with an increase in V2O5 content. borate glass; vanadium; FTIR; density https://mpm.spbstu.ru/article/2011.18.4/ MPM_12_1_P04.pdf

RAR RUS 64-75 Aalto University School of Science and Technology Lioubtchenko

Finland

Kotel'nikov Institute of Radio Engineering and Electronics (Fryazino Branch) RAS Briantseva

Moscow, Russia

Kotel'nikov Institute of Radio Engineering and Electronics (Fryazino Branch) RAS Markov

Moscow, Russia

Surface Acoustic Wave Monitoring of Thin Au Film Deposition on GaAs Surface Deposition of thin Au films with thermal evaporation in vacuum is widely used in the technology of the GaAs microwave and optical devices. The film formation in fact is a multi-stage process, including various physical and chemical transformations, that is interpreted as thin-phase epitaxial growth. It was studied by many authors, mostly by observation of the results of metal deposition with optical or electron microscopy, Auger spectroscopy and other methods. In this paper we introduce results of in situ monitoring of the metal (Au) deposition process with surface acoustic waves. SAWs at frequencies near 100MHz were exited at the (100) surface of the semiinsolating GaAs with interdigital transducers. Phase velocity and attenuation of the SAW was precisely measured and analyzed as a function of the film deposition time (film thickness). Specific time-domain responses and results of Fourier analysis give information about surface and near-surface transformations during the deposition and give new opportunities to control this process [1-2]. SAW diagnostics can be applied to monitoring and control of any epitaxial growth processes, if SAW propagation in the substrate is provided. SAW propagation; GaAs surface; diagnostics; thin Au film https://mpm.spbstu.ru/article/2011.18.5/ MPM_12_1_P05.pdf

RAR RUS 76-101 Institute of Problems of Mechanical Engineering RAS I.A. Ovid’ko И.А.

St.Petersburg, Russia

Crack Generation in Nanomaterials at High-Strain-Rate and Quasistatic Regimes of Deformation An overview of experimental data, computer simulations and theoretical models on crack generation in nanocrystalline materials at high-strain-rate and quasistatic deformation regimes is presented. The basic experimentally documented facts and results of computer simulations in this area are discussed. A special attention is paid to theoretical models describing processes of nanoscopic crack generation near microcrack tips and second-phase nanoinclusions in nanocrystalline materials at high-strain-rate and quasistatic deformation regimes. nanomaterials; mechanics; cracks; fracture https://mpm.spbstu.ru/article/2011.18.6/ MPM_12_1_P06.pdf