A5050043334- Surface Treatment and Coatings
- Surface Treatment and Residual Stress
- Material Properties and Applications
- Metal Alloys Wear and Properties
- Corneal surgery and disorders
- Advanced materials and composites
- Electromagnetic Effects on Materials
- Engineering and Environmental Studies
- Corneal Surgery and Treatments
- Metal and Thin Film Mechanics
- Engineering Technology and Methodologies
- Material Properties and Failure Mechanisms
- Advancements in Materials Engineering
- High-Velocity Impact and Material Behavior
- Titanium Alloys Microstructure and Properties
- Diamond and Carbon-based Materials Research
- Glaucoma and retinal disorders
- Intermetallics and Advanced Alloy Properties
- Medical and Biological Sciences
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Ocular Surface and Contact Lens
- Polymer Science and Applications
- Ophthalmology and Visual Impairment Studies
- High-Temperature Coating Behaviors
- Injection Molding Process and Properties
Volgograd State Technical University
2016-2025
A semi-analytical model of deformation metal specimens surface-hardened by combined electromechanical and ultrasonic treatment under axial bending soft-cycle loads with a given asymmetry coefficient is proposed. An algorithm for reconstructing stress-strain curves fatigue strength high-strength surface layer described. Examples such diagrams steel 45 are on the basis results limited number experiments, using without continuous hardened layer.
Abstract The microhardness of individual morphological structures the hard coat seed Gleditsia triacanthos L. was measured. Measurements were made on transverse and frontal planes. Based differences in hardness two planes, anisotropy revealed. entire has a special which can be compared with hardwood like oat wood. An interesting feature endosperm, comparable to epidermis. Further study processes that occur seeds during imbibition is based obtained data. Mathematical modeling methods are most...
Changes of structure, phase composition and microhardness in high-strength α + β titanium alloy were investigated after electromechanical treatment (EMT) subsequent aging. The EMT was performed with alternating current density (j 300 600 A/mm2). aging upon heating at °C exposure for 14 h. Methods scanning electron microscopy, X-ray micro spectral durometric analyses used. Modified layers (up to 200–250 µm depth) on the surface formed due intensive thermo-deformation during following...
В статье предложено решение с единых позиций актуальной для механики, материаловедения и смежных наук проблемы поверхностного упрочнения металлического тела в условиях высокоэнергетических технологических воздействий.На примере импульсной электромеханической обработки (ЭМО) изложены постановка анализ системы связанных задач формирования структуры механических свойств обрабатываемого тела.Приведен алгоритм решения задачи термоупругопластичности учетом изменения при ЭМО термо-структурного...
Представлена новая постановка задачи о статическом расширении.Рассмотрена контактной термосиловой с учетом фазовых превращений и численное решение её термоструктурной подзадачи, возникающей при моделировании процесса поверхностного упрочнения электромеханической обработкой (ЭМО).Предложена математическая модель формирования структуры металлических сплавов ЭМО на основе совместного анализа расчетных данных динамике температурных полей термокинетической диаграммы примере титанового сплава...
A framework for finite-element modeling of structure formation and stress-strain state in metal alloys subjected to electromechanical treatment (EMT) is presented. The processes creating the hardened layers with ultradisperse improved operational characteristics on surface products are considered within a unified system. main stages constructing set models temperature-force actions during EMT leading structural-phase transformations technological residual stress fields described. used based...
МОДЕЛИРОВАНИЕ ТЕПЛОВЫХ ПРОЦЕССОВ ПРИ ПОВЕРХНОСТНОЙ ОБРАБОТКЕ НЕОДНОРОДНЫХ МЕТАЛЛИЧЕСКИХ ТЕЛ ВЫСОКОТЕМПЕРАТУРНЫМ ДВИЖУЩИМСЯ ИМПУЛЬСНЫМ ИСТОЧНИКОМВ.П
256 subjects (256 eyes) participated in the study: 174 healthy individuals (174 with normal corneas different refraction and 82 patients (82 keratoconus at stages 1, 2 3. Based on mathematical modeling, biomechanical corneal properties patterns of 2, 3 were evaluated. Mathematical modeling made it possible to determine dimensions degrees local reduction, which depended disease stage practically did not change from shape keratopographic pattern localization.
The tensile strength in the cured state of molding and core sands is one important characteristics materials.However, there a significant spread values at determining strength, which indicates deficiencies existing methodology.The standard sample for "figure-of-eight" shape.When it tested tension, stresses holdsite points under central loading are 2-2.5 times greater than neck; therefore 8-12 % samples destroyed points, not along neck.In this article, proposed to change design -to make...
Abstract Original article Experience in the application of mathematical modeling for predicting outcome treatment progressive keratoconus E.G. Solodkova, S.B. Izmailova, B.E. Malyugin, I.N. Zakharov, V.P. Fokin, S.V. Balalin, E.V. Lobanov, V.A. Sivolobov, V.H. Le S. Fyodorov Eye Microsurgery Federal State Institution, Volgograd branch, Volgograd, Russian Federation Moscow, Technical University, Purpose. To analyze results applying to plan, predict and control effects ultraviolet corneal...
A comparative analysis of corneal saturation with riboflavin solution during standard, modified and transepithelial techniques collagen crosslinking on 15 porcine cadaveric eyes using the histologic method investigation was carried out. The results study confirmed need for de-epithelialization to ensure sufficient cornea solution. Partial de-epithelization in area keratoconus is admissible at carrying out ultraviolet (UV-CXL), because, according histological research, there a spreading into...
Macro- and micrononhomogeneous strain of the surface layer a carbon steel subjected to electrome-chanical hardening has been studied. The relation between relative position hardened unhardened structural elements distribution local bursts in these characteristic zones is found analyzed.
The authors proposed the complex technology of surface hardening titanium alloys based on a combination alloying with boron and carbon, electromechanical treatment (EMT) non-abrasive ultrasonic fi nishing (NUF). results study microhardness features structural-phase state layer 5V pseudo-α-type alloy were presented after various combinations treatments (EMT, NUF, alloying). It was shown that for variety schemes achieved by increasing treated material to 30 – 40 %. greatest effect can be...
The study aims to develop a modified personalized topographically and tomographically oriented technique of ultraviolet corneal collagen cross-linking (UVCXL) affect the area cornea with weakest biomechanical properties as determined by mathematical modeling.Modeling biomechanics keratoconic under conditions external diagnostic action was done using COMSOL Multiphysics® software. Finite-element analysis procured 3D images stress/deformation distribution pattern throughout cornea. Matching...