Materials Literature
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C_<60>-C_<70> two-component fullerene needle-like crystals were synthesized by liquid-liquid interfacial precipitation method. The fullerene needle-like crystals were fractured by a focused ion beam system (FIB) so that the Ga ion beams do not affect the fracture surfaces. The fullerene needle-like crystals were found…
A compatible-symmetric-type bicyrystal model and incompatible-type bicrystal models having inclined grain boundary were employed to conduct crystal plasticity analysis of unidirectional tensile tests, and we investigated changes in patterns of Geometrically Necessary dislocation (GND) bands when nominal strain was 1 %…
Three cationic gemini surfactants of the type N2,N3-dialkyl-N2,N2,N3,N3- tetramethylbutane diamminium bromide namely Ia, Ib and Ic have been synthesized. Their chemical structures were elucidated by the routine methodologies 1H-NMR, elemental analysis and mass spectroscopy. The surface active properties were examined…
Effects of variable fatigue loading with alternate R-ratios on fatigue life of a quasi-isotropic woven fabric CFRP laminate have been studied. Variable R-ratio fatigue tests are carried out in which the stress ratio of fatigue loading alternates between two values that are associated with the same number of cycles to…
Long term durability of solid oxide fuel cell (SOFC) is one of the critical problems to be solved. Thermal stress has severe impact to SOFC electrolyte and electrode which is made from dense or porous ceramics. SOFC stack has much more risk to lead thermal crack by inhomogeneous temperature distribution due to the sta…
The competition between crack self-healing and crack propagation induced by service stress in self-healing materials was investigated in the present study. Especially, it was succeeded that assessment on the displacement at the three-point bending load allows the time which crack propagation is arrested by self-healin…
This paper discusses the electrode wear in electrical discharge machining (EDM) of carbon fiber reinforced plastics (CFRP) in order to clarify the mechanism of low electrode wear. Sinking EDM of CFRP using EDM oil or deionized water was carried out, and the electrode wear rate and the waveform of discharge current wer…
The increment of cutting speed, which works for a high-efficient mechanical processing, causes the increment of cutting temperature. The cutting temperature increment promotes the occurrence of thermochemical wear, and it causes the growth of tool wear. Therefore, in general cases, the cutting speed should be maintain…
The solid oxide fun cells are most efficient in a fuel cell. The gas discharged from the fuel cell can improve the efficiency due to contain an unburnt fuel. This paper discusses system feasibility for the unburnt fuel recirculation by using the ejector. We designed the ejector for suctioning unburnt fuels, and produc…
This paper discusses a melt infiltration method to introduce HfC or ZrC into carbon-fiber-reinforced carbon matrix (C/C) composites. In order to form HfC or ZrC in the porosities of C/C composites, molten HfSi_2 and Zr-10at.%Si alloy were infiltrated. The MI treatments of HfSi_2 and Zr-10at.%Si alloy were conducted by…
Trenden i byggbranschen är att efterfrågan på täta, energisnåla byggnader ökar. Passivhus och andra lågenergikonstruktioner blir vanligare och vanligare. Riskerna med att bygga in organiskt material som trä i dessa konstruktioner har fått branschen att börja titta på alternativa material. Lättbetong är ett material so…
R-curve and fatigue crack growth behavior of partially stabilized zirconia were studied using indentation-strength-in-bending (ISB) method and static and cyclic fatigue tests. The indentation-strength measurements in ISB method indicated that there is no increasing crack extension resistance, that is, a flat R-curve b…
In order to clarify the effect of strain rate and test temperature on the compressive strength of polyimide foam, a series of compression tests for the polyimide foam with two different densities were carried out. By using three testing devices, i.e. universal testing machine, dropping weight machine and direct impact…
Influence of isopropyl alcohol (IPA) supplying to the washing water on a rotating disk was experimentally investigated. Disappearance processes of liquid film and droplet formation behavior on a rotating disk were observed by using a high speed video camera. As a result, it was confirmed that removal of water film and…
Bearing steel (SUJ2) is generally used for the rolling element of ball bearing as its material. Furthermore, ceramics (SJ3N4) is also used with taking advantage of light weight, low-heat-generation and non-conducting substance. However, ceramics is more expensive than bearing steel and its intended end-usage was limit…
We experimentally demonstrate zero index of an in-plane Dirac-cone metamaterial at 1550 nm. This design can serve as an on-chip platform to explore the exotic physics of Dirac-cone metamaterials and its applications in integrated photonics.
As one of advanced functional materials, Shape Memory Polymer was studied on the shape recovery property, the shape fix property, and so on. However, it is difficult to comprehend the simple shape recovery behavior, because the viscoelastic and shape recover behaviors will occur simultaneously. Viscoelastic behavior i…
In recent years, the ever-wider use of composite materials for structural applications in the automotive industry makes it necessary to predict their behavior under varying load conditions. Where the intended use is the axial energy absorption, such structures take the shape of thin walled tubes of circular cross sect…
We are developing a method to analyze gas flows in nanoscale porous materials, based on actual structures of polymer electrolyte fuel cell (PEFC) catalyst layer material obtained by focused ion beam-scanning electron microscope (FIB-SEM). Direct simulation Monte Carlo (DSMC) is employed for the analysis of rarefied ga…
Polypropylene (PP)/aramid fiber (AF) and PP/AF/calcium carbonate (CaCO_3) composites were fabricated by melt-mixing process using a single screw extruder. Dumbbell shaped specimens were also fabricated from these mixture by injection molding process. Tensile and three-point bending tests were conducted using these spe…