Materials Literature
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The aircraft engine continuous airworthiness method in the course of the life cycle has been reviewed. The European Certification System has been reviewed in detail. The certification basis development principles have been provided. The system of aircraft engine configuration management in the course of the life cycle…
Thin films of Mn2O3 doped with Cu have been fabricated using the simplest and cheapest chemical spray pyrolysis technique onto a glass substrate heated up to 250 oC. Transmittance and absorptance spectra were studied in the wavelength range (300 -1100) nm. The average transmittance at low energy was about 60% and decr…
In bulk ceramics, interfaces between adjacent materials can be neglected when evaluating the individual functional properties on the macroscale. However, in nanostructured materials, a region described as an interfacial region can comprise up to 10% of the total volume. By traditional XRD and SEM these regions may be…
Wear is a phenomenon which is surface materials damage or loss between two contact solids surfaces in sliding, rolling, or impact movement. In most cases, wear is caused by the interaction of surface asperities. To reduce the energy loss and equipment damage generated due to the mechanical parts friction in the operat…
The approaches to calculation forced axial compressor blades oscillations are described in present paper. The flow circumferential variation that results in forced blade oscillations was evaluated with CFD methods. The calculated model includes guide vane blades, the researched working wheel's blades, guide vane blade…
The article deals with the reasons of water pollution and environmental safety from getting of pollutants into the water environment as a result of human activities in maritime transport
The method for determining displacement helical surface tap-twisting, deformations caused by pulling the tool under the cutting forces. The obtained results allow us to reduce errors of morphogenesis in wire-tapping by changing the axial pitch of each blade section of the tap-tractor.
Different features of solid and hollow shafts designing are observed. The method to define diameters of dangerous and others cross sections of shaft in order to provide a sufficient margin of strength is offered. Cross section diameter definition is performed based on minimal exceeding of normative margin of strength.…
As a preliminary investigation into the establishment of a lithium removal technique for the components used at the International Fusion Materials Irradiation Facility (IFMIF), experiments were performed on the dissolution of lithium in three solvents: ethanol, pure water, and ethanol–water. In these experiments, hemi…
The equations of transversal isotropic laminated slightly shell of geometrical nonlinear iteration theory was received. Estimation of accuracy is given.
El torneado duro es el proceso de corte consistente en tornear piezas de elevada dureza (e.g. desde 45HRC hasta cerca de 70HRC o incluso mas en algunos casos). Se trata de un proceso capaz de sustituir o simplificar las operaciones de rectificado de componentes tales como ejes, rodamientos, engranajes? que tras el mec…
The highly efficient algorithm for finding the resonance frequencies of rotating blade disks from gas turbine engines was developed. The algorithm based on use of interpolation function at the frequency domain for stresses and material properties. The algorithm don't use resonance diagram to find resonance frequencies…
Встановлено вплив параметрів процесу (температури та часу контакту) на перебіг \nреакції альдольної конденсації пропіонової кислоти з формальдегідом у метакрилову \nкислоту в присутності B2О3–Р2О5–WО3/SiO2 каталізатора у газовій фазі; знайдено оптимальні умови здійснення процесу. The effect of the parameters of the pr…
We carried out finite element modeling of the part roller burnishing process, during which the roller was being subjected to either only normal deforming force or both normal deforming force and driving moment. The stressed-strained states in the strengthened parts are determined for each of two roller burnishing vari…
The thermal and irradiation creep-damage constitutive equations for the case of periodic varying of stress and temperature are given in a paper. Those equations are suggested for the analysis of deformation and long term strength of structural members which are used in spacecrafts. The influence of damage due to therm…
The article considers the issue of the return of piston silumin ÀË25 (ÀÊ12Ì2ÌãÍ) recycling and obtaining of high-quality secondary piston alloy.
Отримано вирази для визначення компонент напруженого стану у корпусі великогабаритного обертового агрегата. Досліджено вплив кутів заповнення та зміщення випалювального матеріалу на величину та розподіл діючих напружень. Показано, що спостерігається завантаженість однієї половини корпусу та розвантаження протилежної.…
сайт Электронной библиотеки Белорусского государственного университета. Содержит полные тексты: - электронных копий изданий, выпущенных в свет издательством БГУ; - учебно-методических материалов факультетов; - отчетов о НиР, материалов конференций; - статей из журналов «Вестник БГУ», «Социология»; - оцифрованных докум…
Проведены комплексные исследования структурных и электрофизических характеристик МНЕМТ-наногетероструктур In0.70Al0.30As/In0.75Ga0.25As, выращенных на подложках (100) GaAs с использованием двух принципиально новых конструкций метаморфного буфера, обеспечивающих различное распределение внутренних деформаций. Методом ре…
Методом математичного планування експерименту побудовано лінії рівних \nзначень властивостей залежно від композиційного складу модифікованих полівінілпіролідоном поліамідних мембран та визначено коефіцієнти регресії, що передбачає розроблення процесу формування плівки з прогнозованими властивостями. Builded experiment…