Materials Literature
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In this report, we conduct a multi-physics simulation coupling dislocation patterning with crystal deformation. We use reaction-diffusion equations for dislocation patterning of cell and subgrain. We derive interaction equations between dislocation field and internal stress field induced by long-range dislocation stru…
This paper presents the nonproportional low cycle fatigue life for oxygen-free high conductivity copper. Strain controlled tension-torsion low cycle fatigue tests were performed using hollow cylinder specimens under four strain paths: push-pull, torsion, combined tension-torsion and 90 deg. out-of-phase strain paths.…
The wetting characteristics of micro-droplets of distilled water on natural mica were observed with an atomicforce microscope(AFM)in AC non-contact mode.The obtained results show that the nano-size water droplets arevery stable in ambient air and more wettable than ordinary water droplets.The purpose of this paper is…
Protective coatings have been used in gas turbine blades and combustors. The resonance ultrasound spectroscopy method by the needle-transducer tripod was used in order to clarity all the elastic moduli of the protective coating. Following results were obtained from the measurement of atmospheric-plasma-sprayed CoNiCrA…
The possibility of application four-layer cells to protect radio engineering devices against vibration is considered. The influence of cell’s geometrical parameters on transmission factor was researched.
In this paper, compressive strength properties of PBO fibers were investigated in direct compression test. Two types of PBO fibers were used in the experiment. One is conventional type of fiber. Another is high modulus type of fiber, and its crystal orientation is higher than conventional type of the fiber. Weibull an…
The effect of irradiation on slip band formation and growth and micro-crack initiation behavior under low cycle fatigue in SUS316L austenitic stainless steel was investigated using accelerator-based proton irradiation and a low cycle fatigue test at room temperature in air. The mean space of the slip line in proton-ir…
Recently, there has been a growing interest to develop microscale devices that can manipulate and transport relatively small volumes of fluids. In this study, we studied the influence of wall surface conditions on microchannel flow. We measured the pressure drop in microchannel flow for three patterns of channel heigh…
In this work I set out to investigate the electrical properties and photocurrent generating capabilities of carbon nanotubes and photoactive materials for use in photovoltaic cells and photo-electrochemical cells. Three different methods of fabrication were employed: dielectrophoresis, vacuum filtration, and the docto…
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Hitozan je kationski biopolimer, pridobljen iz polisaharida hitina. Zaradi svojih izjemnih lastnosti, kot so biorazgradljivost, netoksicnost in protimikrobna ucinkovitost je hitozan nasel uporabnost na razlicnih podrocjih, predvsem v farmaciji, medicini in tekstilni industriji. V zadnjem casu je mogoce opaziti porast…
A new prediction method for fatigue life in very high cycle regime was proposed based on the Paris power law. Exponent m and coefficient C in the power law obtained from experimental S-N data showed a good linear relation on a log-log diagram. Also, the exponent m was explained by the Vickers hardness of materials. Pr…
运用电场激活压力辅助合成（FAPAS）和原位合成技术制备了（TiC）pNi/TiAl/Ti功能梯度材料,研究了电场对材料合成及层界面扩散连接的作用。采用光学显微镜、扫描电子显微镜、能谱和X射线衍射仪分析了梯度材料各层及界面微观组织、相组成和元素分布。结果表明,电场的施加以及TiAl的燃烧反应是合成材料的关键;经原位合成的TiC颗粒均匀细小;金属陶瓷层/TiAl/Ti基板的界面区产生了成分的互扩散并形成了良好的冶金结合。钛板到金属陶瓷层的显微硬度呈梯度变化且具有较好的抗热震性。
For about a half century up to today since the invention of Ti-Ni shape memory alloy, diverse products have been developed. However, compared with iron, copper, aluminum, and other metals and alloys, types of Ti Ni shape memory alloy materials and products made of them are still unpopular. This is because only a small…
Nanocomposite made of photoresist and functional nanoparticles has been greatly expected to active micro components for micro/nano systems made by photolithography only. In this study, we propose an in situ microfabrication method for active microcomponents for microfluidic systems. A sacrifical layer made of a positi…
Разработан метод расчета напряжений и деформаций при закалке железнодорожных рельсов. Использование обобщенного урав- нения теплопроводности гиперболического типа позволило выявить колебательный режим изменения температур, деформаций и напряжений при тепловом ударе, сопровождающем начальную стадию закалки. Другим элем…
There have been a number of issues concerning the sliding characteristics of oil-impregnated sintered bearings caused at the temperature below zero. However, the relationship between bearing design parameters and tribological characteristics below zero has not been clarified yet. In this study, we experimentally inves…
Polytetrafluoroethylene (PTFE) has low frictional properties and it is used for sliding materials. However, because of low wear resistance, it should be improved. CNF is one of the suitable materials for which wear properties can be improved by a small amount of addition. In this study, Carbon Nanofibers were added to…
A polymer electrolyte membrane (PEM) is used as electrolyte in polymer electrolyte fuel cell (PEFC). PEM has to be kept moderately moist for the PEM to have the ability to conduct electricity. Moisture content of film depends on the relative humidity of the supply gas. Since relative humidity of the supply gas is chan…
For the future construction of the large scale space platform on the earth orbit, the structural engineering materials with the high specific strength and modulus is required to braze in space. The combination of carbon/carbon composites and titanium is one of those candidates. In the brazing process of the combinatio…