Materials Literature
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Many reports on the high strength and grain refinement of the flame-resistance Mg alloy has been obtained in thin rolled sheet, but there is little report of rolled plate (thickness of 3 mm) the fabrication process in order to achieve both high strength and large elongation. In development of high strength magnesium a…
Radiography is an effective Non Destructive Testing (NDT) method for inspecting internal and \nsurface defects in engineering materials. It has been applied in this study to establish the integrity \nof welded joints in Jua Kali fabricated products. The welds were evaluated and classified based \non type and size of d…
Magnetic head wear performance was studied usingvarious kinds of D-4OH lubricant thickness of hard disk(HD) media. Different characteristic behavior wasobserved in each lubricant thickness. The difference ofthe behavior was well related with media frictioncoefficiency. At the same time, surface free energychanged as w…
We computed atomistic pathways of deformation twinning with First-principles calculation, and quantified the pathways by two variables: strain γ, and shuffling I which describes non-affme displacements of the internal degrees of freedom. We also computed activation energy of twin boundary nucleation and migration. Bas…
Erosion is a phenomenon that damage the surface of material is removed by the particles impact. Erosive wear becomes a problem in pulverized coal injection system and rotating chute. In order to reach an aim of high safety and low cost, it's important to develop wear resistant material and to estimate of life service…
During the recirculation after postulated loss of coolant accident (LOCA) scenario in PWR, debris that generated in the containment might challenge the core flow path and cause the head-loss across the fuel assemblies. Experimental loop and test section are designed for the debris-loading head-loss tests of fuel assem…
工業的に多用されている粒子充填ゴムの均質化法を用いた応答評価によって様々な粒子の含有率,分布形態等の変形挙動に及ぼす影響が解明され一部設計にも利用されている.しかしながら,負荷方向の急変に伴う特異な応答については未知な部分が多い.本研究は,負荷方向の急変に伴うゴムの応答のモデル化と評価を目指した構成式を提案する.
We analyzed a particle behavior of metal nanoparticles under electric field trapping by directly observing. Electric field trapping is the nanoparticles in the solution is collected toward narrow gap by dielectrophoresis force. We found that the nanoparticles are collected to bridging part, even after the particles ar…
A tensile test of a magnesium alloy (AZ31B) was performed in various temperature environments, and the change of the mechanical characteristics of the magnesium alloy with temperature was examined. A creep test of the magnesium alloy was performed, and the relation between creep damage and the acoustic emission (AE) o…
The micro-columnar-structure in alumina was controlled by the process which consist of unidirectional solidification, freeze-drying and sintering of alumina-slurry. In particular, the effect of additives in the alumina slurry on the formation of columnar-structure was investigated. In the sample made from the slurry c…
Application of partial penetration welding (PPW) to ITER Toroidal Field Coil structure has been proposed because of limited access for weld due to complex shape and low stress components. In order to obtain fatigue crack growth (FCG) behavior of PPW joint in cryogenic environment, Japan Atomic Energy Agency performed…
As a result of the computing power provided by the current technology, computational methods now play an important role in modeling and designing materials at the nanoscale. \n \nThe focus of this dissertation is two-fold: first, new computational methods to model nanoscale transport are introduced, then state-of-the-…
A formulation method of arbitrary shaped curvilinear fibers for laminated fibrous composites is proposed and applied to the multi-objective optimization problem. Two conflicting objectives employed here are the maximum principal strain around circular hole as a mechanical property and throughput of productivity relati…
To obtain the fundamental data for the dynamics of piezoelectric effect of liquid crystals, we measured the difference of voltages of the sheared liquid crystal confined between two concentric cylinders, and observed molecular orientation using a polarization microscope. Furthermore, we performed three-dimensional num…
セルラーゼは，セルロース系バイオマスを分解して構成糖を得るための酵素であり，将来のバイオマス利用に不可欠な鍵酵素である。その研究の歴史は19世紀まで遡ることが出来るが，反応機構の解析が行われたのは20世紀の後半である。その頃の研究は，生化学的または構造学的研究がそれぞれ独自に行われていたが，今世紀に入ってそれら静的な情報を元に動的な解析が多方面から行われている。本総説ではセルラーゼ研究の概史を紹介させていただくとともに，最近著者らが取り組んでいる単分子観察技術を紹介させていただく。
Monte Carlo Brownian Dynamics simulations are used to simulate the properties of polyelectrolyte brushes. For the basic understanding, the effect of linear charge density and surface density of polyelectrolyte brushes is studied. Polyions are grafted to the surface of up to several tens of nanometers pitch. For flexib…
We have been investigating particle flocculation using ultrasound in water. Irradiating kHz-band ultrasound, sub-mm-order/mm-order particles were flocculated in spherical form at a fixed position. This flocculation was caused by Acoustic Cavitation-Oriented Bubbles (ACOBs). The ACOBs were generated by the acoustic pre…
Semi-crystalline polymers have complex hierarchical structures. The effects of these structures on the mechanical properties are not sufficiently understood, because of the difficulty in experimental measurement of deformation behavior of microstructures. In this study, molecular dynamics simulations were performed to…
In a previous study, a novel method for observation of cylindrical surfaces was developed with a laser microscope. With this laser microscope having a wide field of view, cylindrical surfaces can be observed by scanning the focused laser light along the bus direction and rotating the cylinder. However, there is a trad…
An effort has been made to investigate defect accumulation processes in the reactor structure steel during irradiation. Simultaneous reaction rate equations were constructed on a basis of the reaction rate theory, and solved numerically on a computer to understand such microstructural changes as the formation of voids…