Materials physics and mechanics

RAR RUS 95-104 Guru Nanak Dev University Singh

India

Guru Nanak Dev University Singh

India

Guru Nanak Dev University Kaur

India

Statistical Analysis of Stopping Power of Polymers for Heavy Ions stopping power; stopping power codes; heavy ions; polymers https://mpm.spbstu.ru/article/2011.17.1/ MPM_11_2_P01.pdf

RAR RUS 105-117 Institute of Problems of Mechanical Engineering RAS I.A. Ovid’ko И.А.

St.Petersburg, Russia

7003559440 0000-0003-2192-0386 Institute for Problems of Mechanical Engineering RAS Skiba Nikolai nikolay.skiba@gmail.com

St. Petersburg, Russia

Generation of New Nanoscopic Grains near Crack Tips in Deformed Nanocrystalline Materials A theoretical model is suggested which describes the nucleation of new nanoscopic grains (nanograins) near crack tips in nanocrystalline metals and ceramics under mechanical load. In the framework of the model, nanoscopic grain boundaries split and migrate under high shear stresses near crack tips. Migration of mobile grain boundaries with disclination dipoles results in nucleation of nanograins (modeled as parallelograms in 2-dimensional nanocrystalline structures) near crack tips. This process of nanograin nucleation represents a special mode of the rotational plastic deformation and causes a partial high local stress relaxation near crack tips. The latter contributes to enhancement of the fracture toughness of nanocrystalline ceramics and metals. cracks; grains; nanocrystalline materials; plastic deformation https://mpm.spbstu.ru/article/2011.17.2/ MPM_11_2_P02.pdf

RAR RUS 118-125 Institute for Metals Superplasticity Problems of RAS Ermatchenko

Ufa, Russia

Institute for Metals Superplasticity Problems of RAS Kashaev

Ufa, Russia

Production of Aircraft Engine Compressor Rotor Discs with Desired Service Life in Titanium Alloys We consider the problem of optimizing technological regimes of forging aircraft engine compressor rotor discs in high-temperature titanium alloys under conditions of superplastic deformation and suggest a solution to it. We characterize the technological possibilities of producing forged disc billets with a desired structure that provides the formation of a required set of mechanical properties. A general scheme of the technological solution to the problem and of the provision of a required service life in high-temperature two- phase titanium alloys is provided. We present the results of structure studies, investigations of mechanical and service properties of compressor discs with different types of microstructure (globular, bimodal, and lamellar), that are produced in articles during severe plastic deformation under superplasticity conditions. deformation processing; superplasticity; required/desired properties; severe plastic deformation https://mpm.spbstu.ru/article/2011.17.3/ MPM_11_2_P03.pdf

RAR RUS 126-136 University Malaysia Mohd Idrus

Kota Samarahan, Malaysia

University Malaysia Hamdan

Kota Samarahan, Malaysia

University Malaysia Rahman

Kota Samarahan, Malaysia

University Malaysia Islam

Kota Samarahan, Malaysia

Liquefied Tropical Wood/Polypropylene Composites: Preparation and Physico-mechanical Properties In this research, the effects of liquefied tropical wood (LTW) as reinforcing fillers in the thermoplastic polymer composite on the mechanical and physical properties were investigated. The LTW were prepared from tropical softwood species by using phenol as a reagent and sulphuric acid as a catalyst. Polypropylene (PP) as polymer matrix was used with LTW to made LTW/PP composites. The composites were prepared with 10, 20, 30, and 40wt.% LTW using the hot-compression molding method. The effect of LTW on physico- mechanical properties of LTW/PP composites were evaluated using tensile test, three point bending test and water absorption test. It was found that the flexural modulus of elasticity (MOE) and Young.s modulus (E) increased due to the addition of LTW in the composites. In addition, the water absorption and thickness swelling coefficient increased with the LTW loadings. liquefied tropical wood; polypropylene; mechanical properties https://mpm.spbstu.ru/article/2011.17.4/ MPM_11_2_P04.pdf

RAR RUS 137-156 Institute of Problems of Mechanical Engineering RAS Aero

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS Bulygin

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS Pavlov

St.Petersburg, Russia

Hydrodynamics of Liquid Nanolayers A model of liquid nanolayers is developed. The model takes into account an ability of a liquid in nano-clearances to accept anisotropy under action of a hydrodynamical stream, and also to borrow pseudo-crystal structure under action of a crystal substrate. Two fields are introduced: a field of macroscopic velocities V(r,t) and a field of micro-shifts u(r,t). The dissipative phenomena are described by the field V(r,t). The field u(r,t) describes the structural changes caused by displacement of neighboring atoms in short-range order domains. The fields V(r,t) and u(r,t) are found from two vector equations. The first equation is a generalization of the Navier-Stokes equation. The second equation is a generalization of the sine-Gordon equation. The steady-state (Couette and Poiseuille) flows of the structured liquid in a gap between parallel planes are considered. The analysis of solutions allows to establish distinctions in rheological properties of Newtonian and the structured liquids. liquid nanolayers; structure of the immobilized layer; Maxwell effect; a simple shift of liquid nanolayers; fragmentation of nanolayers https://mpm.spbstu.ru/article/2011.17.5/ MPM_11_2_P05.pdf

RAR RUS 157-182 University of New South Wales Jelwan

Sydney, Australia

University of New South Wales Chowdhury

Sydney, Australia

University of New South Wales Pearce

Sydney, Australia

Creep Life Design Criterion and Its Applications to Pressure Vessel Codes Pressure vessels equipment is used in the oil, chemical, nuclear power plant and many other industries. Life prediction of such components subjected to high temperature is very important to avoid the catastrophic consequences of failure. The designer often works to the requirements of a standard or code of practice. In mentioning codes and standards, one should also mention that in many nations there is a national organization which develops such standards. In France, there is the RCC-MR practice code for creep design; the R5 from the British Energy, and many other methods proposed by the European Creep collaborative Committee (ECCC) and the National Institute of Material Science (NIMS) in Japan. However, the major shortcomings of the abovementioned standards, they are not practical to use or/and too conservative which involves many other considerations such as economics, safety and manufacturing problems. This paper describes a relatively pragmatic and accurate paradigm for predicting the lives of such components. The application of the proposed paradigm to an internally pressurized vessel shows that the elastic-plastic-creep life of the component can be predicted with an error of less than 10 %. elastic-plastic creep; creep life assessments; strain energy density; design of pressure vessels at high temperature https://mpm.spbstu.ru/article/2011.17.6/ MPM_11_2_P06.pdf

RAR RUS 183-189 Institute Silicate Chemistry of Russian Academy of Science Konakov V.G.

St.Petersburg, Russia

Scientific and Technical Center “Glass and Ceramics” Golubev

St.Petersburg, Russia

Institute Silicate Chemistry of Russian Academy of Science Solovyeva E.N.

St.Petersburg, Russia

Scientific and Technical Center “Glass and Ceramics” Archakov

St.Petersburg, Russia

Scientific and Technical Center “Glass and Ceramics” Borisova

St.Petersburg, Russia

Federal State Unitary Enterprise Smolensk Production Association “ANALITPRIBOR”, Shorokhov

Smolensk, Russia

Correlation between the Precursor Dispersity and Mechanical Strength of Solid Electrolytes Based on Ce2O3-ZrO2 System Precursor powders with the final 9Се2O3-91ZrO2 (mol.%) composition were synthesized using the reverse precipitation sol-gel method varying the concentrations of the solutions of the initial salt reagents. A set of physical and chemical investigation approaches shows that the mechanical strength of Ce-Zr ceramics depends both on precursor dispersity and on CeO2 content. nanoceramics; precursor powders; dispersity; sol-gel synthesis; solid electrolytes; mechanical strength https://mpm.spbstu.ru/article/2011.17.7/ MPM_11_2_P07.pdf

BRV RUS 190-193 Institute of Problems of Mechanical Engineering RAS Blekhman

St.Petersburg, Russia

Book Review for "An Introduction to the Mathematical Theory of Dynamic Materials" (by K.A. Lurie) None. An Introduction to the Mathematical Theory of Dynamic Materials https://mpm.spbstu.ru/article/2011.17.8/ MPM_11_2_P08.pdf

BRV RUS 194-194 Institute of Problems of Mechanical Engineering RAS I.A. Ovid’ko И.А.

St.Petersburg, Russia

Book Review for "Nanoscience: The Science of the Small in Physics, Engineering, Chemistry, Biology and Medicine" (by H.-E. Schaefer) This book provides a dynamic overview of multidisciplinary research in science of nanoparticles, quantum dots, nanowires, carbon nanostructures, nanoporous materials, nanofibers, nanocomposites, nanofluids, nanostructured bulk materials, films and coatings. In twelve chapters, Nanoscience covers a wide range of topics in this rapidly growing field, with the primary focus placed on fundamental relationships between the structural features of various nanomaterials and their remarkable properties. Also, a special attention is paid to nanomaterials fabrication methods and experimental techniques for characterization of nanostructures and examination of their properties Nanoscience The Science of the Small in Physics Engineering Chemistry Biology and Medicine https://mpm.spbstu.ru/article/2011.17.9/ MPM_11_2_P09.pdf