Materials Literature
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The techniques to heal fatigue damage by electric current have been studied. However, these mechanism was not investigated in detail. In this study, we observed dislocation motion by transmission electron microscope (TEM) before and after applying electric current in a sample cut out from fatigue specimen. The disloca…
Porous pressure sensitive paint (PSP) having fast response and high pressure sensitivity will be a powerful measurement tool to diagnose flow properties in consumer turbomachinery. We have composed test facilities of a turbofan with a transparent casing, to apply a fast-response PSP to measurement of nonstationary pre…
Experiments have been carried out to examine the performance of radiation cooing by new radiation materials, which is produced by mixing the very fine polar crystal metals into the high efficiency heat radiation paints. This concept is caused by increase of the surface area due to the rough surface generated by nano-s…
Tensile tests were performed using plate specimens of self-reinforced polyethylene (SRPE) with short ultra-high molecular weight polyethylene (UHMWPE) fibers. The effect of fiber length on the properties was investigated. The specimens were made by hot-pressing the stacked HDPE films with short UHMWPE fibers distribut…
LIPIcs, Volume 32, SNAPL'15, Complete Volume
Theory of free-vibration acoustic resonance for a two-dimensional grid-framework structure has been developed within the framework of micropolar elasticity and calculus of variations. Numerical analysis based on the Ritz method revealed the excitation of micro-rotational standing wave in a resonant state. It is also r…
Characteristics of droplet removal by air flow on flat surface of semiconductor wafer were experimentally investigated. Effects of air velocity, nozzle angle and droplet volume on removal characteristics were measured. Deformation and removal processes were observed using a high speed video camera. Type A and Type B w…
The hypersonic air-breathing engine, which is currently under development by Japan Aerospace Exploration Agency (JAXA), uses liquid hydrogen as the fuel. In order to accurately control the fuel flow rate during the start-up, it is essential to measure the heat transfer and pressure drop of the two phase flow. These tw…
Slip deformation in tri-crystal models subjected to cyclic deformation is investigated by a finite element crystal plasticity analysis code. Accumulation of geometrically necessary dislocations (GNDs) and statistically stored dislocations (SSDs) are studied in detail. Results of the analysis shown that non-uniform def…
In our study, we challenged to apply the established techniques to fabricate nano-composite materials using C_<60> to TiAlN, which is harder than TiN. Development of the synthesis method of C_<60>/TiAlN nano-composite must give effective industrial contributions. C_<60>/TiAlN nano-composite thin films with constant th…
Thin plates of lead magnesium niobate-lead titanate (PMN-PT) single crystal were ground with various cup-type resinoid-bonded diamond wheels on an ultra-precision surface grinder to obtain super smooth surfaces. The ground surfaces and sub-surfaces were observed with various instruments, such as laser microscope and a…
The interfacial strength between carbon and phenolic resin is studied by using molecular dynamics simulations in order that carbon reinforced carbon matrix composites (C/C composites) has better strength development rates. Simulations are performed by two carbon fiber models, one of which has only carbon atoms and the…
In order to investigate the criterion of unstable crack propagation induced by singular stress field less than 10 nm, the fracture toughness is examined using nano-scale silicon (Si) single crystal specimens with a precrack. Critical value of stress intensity factor at fracture, K_ , is evaluated to be 0.93〜1.09 MPam^…
In order to precisely investigate molten core relocation behavior in the Fukushima Daiichi nuclear power station, we have developed the detailed and phenomenological numerical simulation code named JUPITER for predicting the molten core behavior including solidification and relocation based on the three-dimensional mu…
The objective of this study is to evaluate the performance of SOFC (Solid oxide fuel cell) installed in office buildings. The higher efficiency of power generation is considered advantageous for electricity oriented users like offices in commercial sector. Optimization model to minimize the system cost with co-generat…
Adherens junction (AJ), which links actin cytoskeletons in adjacent cells, directly senses and balances intercellular tension that drives dynamical processes such as morphogenesis and wound healing. As a mechano-sensitive molecule at AJ, α-catenin recruits vinculin under intercellular tension resulting in local actin…
Along with the expansion of a recent power demand, the production of the steam turbine blades has increased, and a lot of forged materials of 12Cr steel, the ferritic heat-resisting steels have become widely used for this usage. However, although this material seems an excellent one as the heat-resisting steels, it ne…
The joining of two different materials is influenced by the factors at multiscale structures. The objective of this report is to unveil the metallic bonding phenomena at multiscale structures during the process of a cold pressure welding between copper and aluminum. A molecular dynamics (MD) simulation method and a sc…
カーボンブラック充てんSBR材料の動特性を解析するための非線形粘弾性構成則について検討した.まず,カーボンブラックを体積比で25%充てんしたSBRを対象として多段式応力緩和試験,繰り返しひずみ試験,大変形中速・低速の1サイクル試験をおこなった.そして代表的な粘弾性モデルである線形粘弾性モデルベースのLarge-Strain viscoelastic modelおよびBergstrom-Boyce modelの材料定数を決定し,それぞれの実験結果の再現性を検証した.その結果,前者は広いひずみ速度範囲の動特性を再現するのは困難であることが示され,後者は再現性の良いシミュレーションが可能であることを確認した.
One of the candidate materials for turbine blade is proposed as continuous fiber reinforced self-healing ceramic composites (shFRC). The shFRCs consist of three components, which are oxide fiber bundle, oxide matrix and self-healing agent interlayer. As the self-healing is generated at only the interlayer, it is neces…