Materials Literature
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In order to investigate suppression of fatigue crack growth in hydrogen-charged chrome molybdenum steel SCM 435 by cavitation peening employing a cavitating jet in water, a load controlled plate bending fatigue tests were conducted with load stress of 400 MPa after cathodic hydrogen charging with and without cavitatio…
Notched off-axis fatigue behavior of CFRP laminate has been studied. Static and fatigue tests are performed at room temperature on unnotched (UN) and center-hole (CH) coupon specimens of a plain woven CFRP laminate for different fiber orientations as well as for different stress ratios. The static and fatigue strength…
The processes occurring in biphase powders of Fe Co Ni at heating in vacuum are studied in the paper. Samples are synthesized by hydrazinehydrate reduction of metal salts in aqua solutions at highly alkaline medium. When drawing phase diagrams of the nanostructured systems some questions related to the deviation of th…
An observation of sliding surfaces and a measurement of the amount of wear are generally performed in order to evaluate tribological characteristics. However, we don't know how friction and wear phenomena change between sliding surfaces during experiments. In this study, the visualization and evaluation of tribologica…
幾つかの主要な超弾性構成則の性能評価を行った.本研究では,カーボンブラック充てん量の異なる3種類のSBR材について,単軸,純せん断,一様二軸引張りの応力-伸長比関係を精密に計測した.ここで,実用上を考慮して100%ひずみ程度までの変形域を対象としている.そして,以下の2種類の調査をした.1つ目は,全実験結果を対象としてそれぞれの超弾性構成則の材料定数を同定して,その材料定数を利用した超弾性モデルが実験結果を再現する性能を調査した.2つ目は,単軸引張り試験の結果のみを対象として超弾性構成則の材料定数を同定して,その材料定数を利用した超弾性モデルが純せん断と一様二軸引張りの実験結果の予測する性能を調査した.その結果,Ogdenモデルの…
For improvement of Sever Accident code, the core relocation process has to be clarified. To clarify core relocation process, it is necessary to understand the melting behavior of fuel elements. But the melting process of fuel elements cannot be clarified only by the experimental study. Then we are developing the numer…
We consider a canonical spherical scattering problem, and show that by coating a rigid spherical body with a fiber-reinforced layer of a metamaterial with a suitable gradient in material properties, the scattering of shear waves from the body can be significantly reduced, as many shear modes are guided around the body…
An ionic polymer-metal composite (IPMC) actuator, which consists of a thin perfluorinated ionomer membrane and electrodes plated on both surfaces, undergoes a large bending motion when a low electric field is applied across its thickness. IPMC actuators are lightweight and soft and can operate in solutions. They are t…
Multichannel measuring systems are used to measure strains and accelerations during drop tests of containments for dangerous goods. Conventional systems require cabling of each sensor and co-falling of the cable harness, causing problems in the test preparation and execution. Promising results of a single cable measur…
It is well known that WC-Co cemented carbides have an excellent wear resistance. However, information about their fatigue crack growth behavior is limited. In the present study, the fatigue crack growth behavior of the fine grained WC-Co cemented carbide was investigated as a function of the stress ratio, R. The crack…
SiC fiber reinforced SiC matrix composites (SiC/SiC) are promising material for turbine engine components of future turbo-fan aero-engines. SiC/SiC exhibits nonlinear stress-strain behavior due to matrix crack propagations. The objective of this study is to evaluate non-linear stress-strain behavior and strain distrib…
Diamond-like carbon (DLC) coatings have begun to appear attractive for automotive parts due to their excellent friction and wear resistance properties. In recent years, many researchers focus on their tribological properties under boundary lubricated contacts. Especially, it is well known that hydrogen free ta-C DLC c…
The deformation mechanism of extruded AZ31 magnesium alloy rod under various temperature conditions was studied. The deformation mechanism was made clear by the changes of microstructures. The clarified mechanism was particularly what acts on the orientation for which trans granular sliding and grain boundary sliding…
The numerical simulation on ionic liquid electric double layer capacitors (EDLCs) with mesoporous electrodes consisting of cylindrical pores has been conducted to clarify the effect of porous geometry on the performance of the capacitor. The results show that the charge at the surface of the porous is dominant and the…
As current reactors approach the end of their operable lifetime, new reactors are needed if nuclear power is to continue being generated in the United States. Some utilities have already began construction on newer, more advanced LWR reactors, which use the same fuel as current reactors and have a similar but updated…
The internal oxidation depth of the self-healing agent by the oxygen diffusion in matrix was defined as the indicator to durability assessment for self-healing ceramics. Using the reported oxidation diffusion coefficient, The attainment depth of the oxygen ion by inner direction diffusion was evaluated. Furthermore, t…
Vertically aligned carbon-nanotube (CNT) film is expected as a superior low contact thermal resistance material. The microscopic deformation behavior of CNT in contact is clarified by previous study, but the difference in the deformation behavior when changing the length of CNT is not clarified. The vertically aligned…
The present paper investigates effect of line-beam irradiation on electrode films for micro solid oxide fuel cells in a process of green-tape laser sintering. The line-beam formed with a cylindrical lens was scanned in parallel to or in vertical to the long axis of the beam, having the advantages of a uniform sintered…
Bacterial Cellulose is the natural cellulose, characterized by a three-dimensional structure network of micro fibril. BC possesses an array of unique properties, including high crystallinity, high tensile strength, therefore BC have been an interesting topic in the field of research and development. In this paper, the…
パワーデバイスで問題となる異種材界面はく離に対して,温度サイクル試験環境を想定したせん断の破壊モードに対応するはく離評価法を提案し,パワーデバイスに用いられる高耐熱封止樹脂のはく離強度評価を検討した.