Materials Literature
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The characteristics of anodized aluminum pressure-sensitive paint (AA-PSP) in moist air is investigated. We fabricated an experimental facility in which we can independently control pressure, temperature and humidity. Measuring the humidity sensitivity, we found the emission intensity increases as the relative humidit…
Porous aluminum sandwiches with the aluminum foam and dense steel sheets were fabricated by the friction stir processing (FSP) route. Using the fabricated sandwiches, failure tests were carried out under combined loading of tensile type and shear type. Under only shear type loading, two types of failure (i.e., tensile…
This paper describes improvement of the active laminate in bonding strength by using the oxide film of aluminum for insulation. Conventional types of the active laminates were made by hot pressing of an aluminum plate as high coefficient of thermal expansion (CTE) material, a unidirectional carbon fiber reinforced pla…
To use DMFC as a portable power source, it is demanded to miniaturize the whole system. We succeeded to eliminate the water condensing system by using the developed low water permeation MEA, which enabled the produced water to return from the cathode to the anode through the membrane. To achieve smaller system, we dev…
Japan reserves oil for stable supply of energy. Bottom plate of oil storage tank degrades with time. Therefore, organic coating is coated to the bottom plate. Degradation of the coating is being investigated in the open inspection. This paper describes the results of survey data of about 30 years. The collected data w…
Spray cooling is used in wide field of industry. Liquid-solid contact situations were visually observed while a superheated solid surface was cooled by liquid spraying, in order to obtain fundamental information on quenching phenomena related to steel production process. The liquid-solid contact situations were observ…
The stress-strain curves for carbide cermets which are typical sprayed coatings have been identifled by using the elasto-viscoplastic damage constitutive equation with twelve material constants based on continuum damage mechanics. Locally-coupled approach has been applied to the elasto-viscoplastic damage analysis of…
In this study, the effect of isopropyl alcohol (IPA) on electrochemical area(ECA) was investigated in the case of adding IPA to electrode catalyst ink. IPA can decrease the formation of secondary aggregate and enhance the dispersion of ionomar into the secondary aggregate because IPA can reduce the surface tension of…
Capillary induced forces are widely observed in fine structures where liquid flows along solid surfaces, such as wet-etching process in micro/nano-pillar fabrication. Undesirable bending or collapse of the structure occurs if they are improperly considered in the structural design. In this study, liquid column formati…
A simple mechanical damage testing method, combined with Acoustic Emission (AE) monitoring was developed in order to investigate the mechanical performance of solid state electrochemical devices under operating conditions. The damage testing method was applied to solid oxide fuel cells and lithium ion batteries. The d…
Effects of extrusion ratio (ER) and lubricant during extruding on mechanical properties and fracture behavior of poly(lactic acid) (PLA) screws were investigated in terms of shear strength and acoustic emission (AE). Self-reinforced PLA screws were manufactured from axially extruded PLA billets by forging. Shear stren…
We have developed a modified three-dimensional x-ray diffraction (3DXRD) microscopy, which enables us to obtain three-dimensional orientation map non-destructively. In other study we have examined the plastic behavior for polycrystalline iron by the 3DXRD experiment. In this study we performed the crystal plasticity f…
Hydrogen embrittlement of steel was caused due to hydrogen in the material. Fracture surface due to hydrogen embrittlement is expected to concern with the local hydrogen distribution around a crack tip, and this distribution depends on the material property and loading condition. On the other hand, slow stress rate te…
Ni-rich Ti-Ni shape memory alloy was fabricated by the powder metallurgy (PM) process. The sintering and solution-treatment conditions were examined. And the effects of aging treatment conditions on the microstructure and transformation temperatures of Ti-55at%Ni alloy were investigated. The optimum sintering temperat…
An experimental method was developed in order to evaluate the mixed mode (I+II) impact fracture toughness for CFRP (Carbon Fiber Reinforced Plastic) adhesive joints using ramped incident wave. The MMF (Mixed Mode Flexure) specimen was employed for the evaluation of energy release rate. The dynamic response of the spec…
Porous metals like aluminum foam, which has relatively large closed cells around several millimeters, are expected as an ultra lightweight structural material in various industrial fields. Research and development of such porous metals are increased in the 1980s and some industrial applications were proposed and incre…
The use of thermal barrier coatings (TBCs) for turbine blades in gas turbine engines has allowed higher engine operating temperatures exceeding the order of 1200 ℃ at the surface of the TBC top coat. More recently, it has been recognized that at these high temperatures the TBCs can be damaged by calcium-magnesium-alum…
A fuel cell powered car using a clean energy attracts attention as a countermeasure to some environmental problems so that the fuel cell powered car uses hydrogen fuel and does not exhaust carbon dioxide and the nitrogen oxide. High pressure hydrogen storage container of fuel cell powered car is made by cylindrical al…
不均質材の熱弾性解析を行う場合,従来の境界要素法では内部セルを用いて行う.内部セルを使用しない方法がいろいろ提案されているが,完全な手法がない.二重相反境界要素法では,多くの種類のあるRBFの選択に工夫が必要である,内部セルを使用しない方法が提案されているが,ポアソン比は一定である必要がある.一方,著者は,三重相反境界要素法により,セルを用いないで任意の物体力を伴う二次元弾性問題を解析する方法を提案している.本論文では三重相反境界要素法により,傾斜機能材や複合材などの不均質材をメッシュレスで熱応力解析する方法を示す.弾性係数およびポアソン比が変化する場合は,既に発表しているので,熱膨張係数が,位置に依存する場合を中心に述べる.本手…
Dynamic numerical simulations for penetration into a target of granular medium were performed and the time and spacial distributions of ejectors were clarified for two kinds of projectiles. Trajectories of particles were also identified and were discussed in connection with the densified wave propagation in the target.