Дисковый волновой конечный элемент
The disk harmonic finite element was developed. FORTRAN code program was developed for modal analysis of rotating nonuniform heated disks from the gas turbine engines. Natural frequencies of disks were explored.
Materials Literature
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Моделирование устойчивого роста усталостных трещин в дисках турбины авиадвигателей при простом и сложном циклах нагружения
Techniques for modeling stable fatigue crack growth in highly stressed structural parts under simple and complex loading cycles have been developed which are based on the theory of local high-energy-type fracture mechanism acting at a crack front in the second stage of fatigue crack kinetics. The techniques have been…
Mixed Variational Principles in Nondissipative Coupled Thermoelasticity
This paper is concerned with a general framework to consistently derive all the variational formulations with different combinations of the state variables for a thermoelastic structural model based on the nonlinear thermoelasticity of type II proposed by Green and Naghdi.Comparisons with existing formulations are als…
Fabrication of Aluminum-Silicon Carbide Composites Using Spray-Assisted Roll Bonding
The fabrication of nanoparticle reinforced sheet metal composites may result in composites with promising mechanical, thermal and electrical properties. Cold roll bonding (CRB) is a good candidate for fabricating such composites as it can be easily scaled up for industrial production. Moreover, it eliminates some of t…
Fatigue Evaluation of 8630 Cast Steel Subjected to Post-Weld Heat Treatment and Stress Relieving
The effect of post weld heat treating and stress relieving on the fatigue strength of AISI 8630 cast steel, weld repaired with different filler materials, is the primary objective of the study. To determine the material properties, experiments included monotonic tensile tests, load-controlled fatigue tests as well as…
Processing of Porous Zirconium Tungstate and Their Thermomechanical Properties
This paper explores a new processing method to fabricate porous zirconium tungstate (ZrW2O8 or ZT) with the porosity content up to 40% in volume. The method uses spherical graphite powders that are mechanically stable, allowing us to compact with ceramic powders in dry condition. Thus, the ceramic powders mixed with s…
Research About Key Factors in Jet Puncturing Process for Multilayer Composite Material
In the traditional molding process of laminated carbon fiber reinforced C/C composites - preform, it always causes great damage to a high modulus carbon fiber. Research about key factors for jet puncture in multilayer composite material is proposed in this paper. With the method, carbon fiber is added into the laminat…
Viscosity analysis of polypropylene‐kaolin composites measured using single‐screw extruder
Deviations between data for the apparent and true viscosity measurement are commonly observed in the rheological studies of thermoplastics. To validate the significance on the usage of these data on the processing side, filling analysis for the apparent viscosity and true viscosity of polypropylene‐kaolin (PP‐kaolin)…
Adsorption of probe molecules in pillared interlayered clays: Experiment and computer simulation
In this paper we investigate the adsorption of various probe molecules in order to characterize the porous structure of a series of pillared interlayered clays (PILC). To that aim, volumetric and microcalorimetric adsorption experiments were performed on various Zr PILC samples using nitrogen, toluene, and mesitylene…
Fabrication of Aluminum Nanocomposite by Ultrasonic Spray Deposited Sheet Bonding
Reinforcement with nano-sized particles offers a promising potential to significantly enhance the mechanical, electrical, and thermal properties of a metal matrix composite (MMC). One of the challenges of synthesizing nanocomposites, however, has been the dispersion and control of the nano-reinforcement materials. In…
Sizing Design for 4-High Cold Rolling Mills
As the demand for thin and ultra-thin gage for cold-rolled sheet metals increases, cold rolling manufacturers and sheet metal producers must utilize technological advancements to stay competitive globally. To manufacture a competitive rolling mill, the mill designer must identify an appropriate mill configuration, rol…
Effect of EAM Pulsed Current on 1450 MPA Martensitic Steel
Martensitic steel is often used to fabricate parts that require high tensile strength. However, this quality, and the material’s low ductility, requires manufacturing equipment with higher tonnage capacity. This paper explores a potential way to reduce the tonnage requirement by temporarily reducing the steel’s requir…
Microstructural and Dynamic Mechanical Characterization of Biodegradable Magnesium-Calcium Alloy for Orthopedic Implants
Magnesium-Calcium (Mg-Ca) alloy is an emerging metallic biomaterial for manufacturing biodegradable orthopedic implants. However, very few studies have been conducted on mechanical properties of the bi-phase Mg-Ca alloy, especially at the high strain rates often encountered in manufacturing processes. The mechanical p…
Sub-Surface Crack Analysis for Diamond Slurry Lapping of Sapphire Wafers
Sapphire or mono-crystalline aluminum oxide wafers have been popularly adopted as the substrates of epi-layer process for the rapid growing demands of high-brightness light emitting diode (HB LED) industry. The HB LED devices for solid-state illumination have attracted immerse investigation of sub-surface crack proble…
Modelling Static and Dynamic Kinetics of Microstructure Evolution in Type 316 Stainless Steel During Hot Rolling
In this study, the kinetics of microstructure evolution during hot rolling of type 316 austenitic stainless steel is investigated. First, its kinetics during the dynamic and static events, known as the material genome, is driven by single- and double-compression tests at several temperatures and strain rates. Inverse…
Effect of freeze‐thaw pretreatment on thermal drying process and physicochemical properties of chitosan
ABSTRACT The effect of freeze‐thaw pretreatment on the thermal drying process and physicochemical properties of chitosan was investigated in this study. Results showed that the freeze‐thaw treatment changed the form of chitosan paste and reduced 75.6–77.7% of the water content. The freeze‐thaw treatment decreased the…
Laser Crystallization of Transparent AZO Films on Sapphire With High Electron Mobility for Photo-Application
Transparent and conductive alumina-doped ZnO (AZO) films were deposited on sapphire substrates at room temperature by room temperature pulsed laser deposition (PLD) and then followed by laser crystallization at 500K. As implied by the Multiphysics Simulation, X-ray diffraction spectra and morphological characterizatio…
Numerical Simulation of the Austenitizing Process in Hypoeutectoid Fe-C Steels
For predicting of diffusive phase transformations during the austenitizing process in hypoeutectoid Fe-C steels, a two-dimensional model has been developed. The diffusion equations are solved within each phase (α and γ) using an explicit finite volume technique formulated using a square grid. The discrete α/γ interfac…
Technology and Mechanical Properties of Samples Obtained by Injection From Arboform L, V3 Nature Reinforced With Aramid Fibers
The use of recyclable materials has become an important trend in all activity areas, reason why material based on liquid wood called Arbofill, Arboblend and Arboform will replace plastic in different applications in the near future. The new materials are the main substances that have an important effect on company dev…
Biochemical and histological effects of different light doses on hyperthermic therapy with gold nanorods
Efforts have been made to develop new treatments for cancer with fewer side effects and with a better outcome. Gold nanorods are promising as a cancer treatment device when activated by a light source, usually in near-infrared region. In this study we investigated the effect of different light doses applied to tumors…