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  • Influence of Microstructure on Fatigue Fracture Characteristics of Al2O3

    Kido Mitsuo , Katayama Gounozyo , Inoda Nana , Tsuchibushi Yasuyuki

    … Fatigue fracture characteristics under static and cyclic loading were investigated for three kinds of Al2O3, with microstructures controlled by sintering additives (MgO, SiO2+CaO) and particle size. … The measurements of R-curve behavior and COD under cyclic loading showed that the grain bridging effect of Material SC was reduced further than that of Material SC-f. …

    広島工業大学研究紀要 33, 67-74, 36192-00-00

    機関リポジトリ

  • Grain size control of ZIF-8 membranes by seeding-free aqueous synthesis and their performances in propylene/propane separation

    TANAKA Shunsuke , OKUBO Kenta , KIDA Koji , SUGITA Miki , TAKEWAKI Takahiko

    … The grain size of polycrystalline membrane is directly related to a graft density of ligand-analogous surface modifier. … As a conclusion of the combined characterization with adsorption analysis, it was found that the sieving of C3H6/C3H8 by our seeding-free aqueous-synthesized ZIF-8 membrane is mainly governed by diffusion-driven separation process. …

    Journal of Membrane Science 544, 306-311, 2017-12-15

    機関リポジトリ DOI

  • Effect of ultraviolet irradiation on poly(3,4-ethylenedioxythiophene) doped with ClO

    Takahashi Momoko , Deguchi Toshiaki , Takashiri Masayuki

    … UV irradiation led to an agglomeration of PEDOT domains, which in turn causes an increase in the grain size and the surface roughness, as observed in scanning electron microscopy images. … Electron spin resonance (ESR) analysis revealed that the spin density was drastically reduced by short-term UV irradiation of less than 5 min. Upon increasing the UV irradiation time, the spin density gradually increased. …

    Jpn. J. Appl. Phys. 56(6S1), 06GJ03, 2017-05-10

    応用物理学会

  • <論文・報告>粒子サイズを再現した砂柱の崩壊シミュレーション

    Yasuda Sana , Murakami Akira , Fujisawa Kazunori , Fukumoto Yutaka

    … We chose glass beads that have a grain diameter of approximately 1 mm as the material for the experiment. … We employed PIV (Particle Image Velocimetry) analysis to obtain the profile of displacement and the speed of transformation during the failure process. …

    ELCAS Journal 2, 91-94, 2017-03

    機関リポジトリ

  • ボヘミア山塊南部Lhenice Shear Zoneに産する泥質片麻岩の全岩化学組成

    小林 記之 , 平島 崇男 , SVOJTKA Martin

    …   Whole rock chemical analysis was carried out for sillimanite-cordierite-biotite-garnet (Sil-Crd-Bt-Grt) gneisses at Ktiš in the Lhenice shear zone of the southern Bohemian Massif, Czech Republic, in order to consider the origin of this rock. …

    名古屋学院大学論集. 人文・自然科学篇 = Journal of Nagoya Gakuin University 53(2), 51-68, 2017-01

    機関リポジトリ DOI

  • Brittle Fracture Stress of Ultrafine-Grained Low-Carbon Steel

    Inoue Tadanobu

    … <p>The variation of brittle fracture stress on grain size in a wide range of 138 μm to 1 μm was studied in low-carbon steel. … The steel bars with an ultrafine elongated grain structure and equiaxed grain structure were fabricated by caliber rolling. … The brittle fracture stress was quantitatively estimated through a three-point bending test at 77 K with a notch sample and finite element analysis. …

    MATERIALS TRANSACTIONS 58(10), 1505-1508, 2017

    J-STAGE

  • Grain Boundary Sliding-Induced Creep of Powder Metallurgically Produced Nb-20Si-23Ti-6Al-3Cr-4Hf

    Seemüller C. , Heilmaier M.

    … The analysis of the creep behavior regarding its dependence on microstructural and testing parameters such as grain size, stress, and temperature reveals grain boundary sliding as the prevalent deformation mechanism. … This creep mechanism was found to be a direct result of the small grain/phase sizes after powder metallurgical processing and led to a creep resistance even lower than that of a single-phase niobium-based alloy.</p> …

    MATERIALS TRANSACTIONS, 2017

    J-STAGE

  • コシヒカリシンク拡大染色体断片置換系統を用いたイネの登熟、転流向上関連QTLの解析

    山田 真代 , 村田 和優 , 岡村 昌樹 , 近藤 始彦

    日本作物学会講演会要旨集 244(0), 110, 2017

    J-STAGE

  • 砥粒径のばらつきが研削面粗さに与える影響に関するシミュレーション解析

    前崎 智博 , 蛯名 雄太郎 , 周 立波 , 清水 淳 , 小貫 哲平 , 尾嶌 裕隆 , 乾 正知

    研削砥石は砥粒,結合剤,気孔の3 要素および砥粒の種類,砥粒径,結合剤の種類,結合度,砥粒率の5 因子によって構成される.このうち砥粒径はおおよそ平均粒径で表記されるが,実際の砥粒径は不揃いである.これまでの研究では,砥粒径のばらつきが砥石作業面の砥粒突き出し量の分布に大きく影響を与えることがわかっている.本研究では,砥粒径の分布が研削面粗さに与える影響についてシミュレーションによる解析をおこなっ …

    精密工学会学術講演会講演論文集 2017S(0), 135-136, 2017

    J-STAGE

  • Alloying Effects of Molybdenum and Niobium on Chromium Bearing Low Alloy Steel for Water Ballast Tank

    Shin Young-Woong , Song Sol-Ji , Kim Jung-Gu

    … An SEM analysis after 15 days immersion in the artificial seawater indicated that, among the tested specimens, the Cr+Mo+Nb bearing steel formed the smoothest rust layer with the least cracks. … An EPMA analysis for the cross section of the rust layer confirmed that the Nb elements of the Cr, Cr+Nb, and Cr+Mo+Nb bearing steels were enriched at the rust layer; …

    MATERIALS TRANSACTIONS 58(9), 1290-1298, 2017

    J-STAGE

  • UAVによる七里御浜海岸の空撮画像を用いた礫粒径の算定に関する研究

    菊 雅美 , 中村 友昭 , 水谷 法美

     礫浜海岸である七里御浜では,侵食が深刻な問題となっており,現地海岸の漂砂機構の解明と有効な侵食対策の実施が求められている.漂砂機構の解明には,礫粒径の特性を把握する必要があり,UAVによる空撮画像から礫粒径を算定可能になれば,広範囲における礫粒径の時空間分布を把握でき,現地海岸の漂砂特性の解明に有用と考えられる.本研究では,画像解析ソフトBASEGRAINを用いてUAVにより撮影した七里御浜海岸 …

    土木学会論文集B3(海洋開発) 73(2), I_588-I_593, 2017

    J-STAGE

  • Brittle Fracture Stress of Ultrafine-Grained Low-Carbon Steel

    Inoue Tadanobu

    … <p>The variation of brittle fracture stress on grain size in a wide range of 138 μm to 1 μm was studied in low-carbon steel. … The steel bars with an ultrafine elongated grain structure and equiaxed grain structure were fabricated by caliber rolling. … The brittle fracture stress was quantitatively estimated through a three-point bending test at 77 K with a notch sample and finite element analysis. …

    MATERIALS TRANSACTIONS, 2017

    J-STAGE

  • Alloying Effects of Molybdenum and Niobium on Chromium Bearing Low Alloy Steel for Water Ballast Tank

    Shin Young-Woong , Song Sol-Ji , Kim Jung-Gu

    … An SEM analysis after 15 days immersion in the artificial seawater indicated that, among the tested specimens, the Cr+Mo+Nb bearing steel formed the smoothest rust layer with the least cracks. … An EPMA analysis for the cross section of the rust layer confirmed that the Nb elements of the Cr, Cr+Nb, and Cr+Mo+Nb bearing steels were enriched at the rust layer; …

    MATERIALS TRANSACTIONS, 2017

    J-STAGE

  • 1-2-2 粉砕したコークスのガス化反応速度解析

    沼澤 結 , 原 有輝 , 松尾 翔平 , 齋藤 泰洋 , 松下 洋介 , 青木 秀之 , 宍戸 貴洋 , 吉田 拓也 , 奥山 憲幸

    … <p>To predict coke gasification reactivity, a weight loss of pulverized coke during gasification was measured using a thermogravimetric analysis and the measured data was fitted by the grain model considering particle size distribution of coke. …

    日本エネルギー学会大会講演要旨集 26(0), 12-13, 2017

    J-STAGE

  • Ni基鋳造材246合金の片振り疲労強度評価および微小き裂発生と進展挙動に及ぼす微視組織の影響

    倉光 貴之 , 藤井 達也 , 蓮沼 将太 , 小川 武史 , 禹 明勲 , 高梨 正祐

    … As the result of the observation of etched specimen, the grain size is from 3 mm to 5 mm. … Growth orientation of dendritic structure varies in every grain. … The result of elemental analysis, Si and Ti are detected at dendritic boundary. … As the result of EBSD, the crack initiation site is near grain boundary and the crack grows along slip plane.</p> …

    日本機械学会論文集, 2017

    J-STAGE

  • EBSD Observation of Pure Iron with Near-Cube Orientation Fabricated by Cold Rolling and Annealing

    Okai Daisuke , Yae Masatoshi , Yamamoto Atsushi , Doi Toshiya

    … <p>The orientation characteristics of a pure iron tape fabricated by cold rolling and annealing were evaluated using electron backscatter diffraction (EBSD) analysis. … The average grain size is approximately 370 μm for the near-cube oriented iron tape.</p> …

    MATERIALS TRANSACTIONS 58(5), 838-841, 2017

    J-STAGE

  • The relationship between the proportion of microboudinaged columnar grains and far–field differential stress: A numerical model for analyzing paleodifferential stress

    MATSUMURA Tarojiro , KUWATANI Tatsu , MASUDA Toshiaki

    … This procedure is particularly time–consuming when conducting stress analysis for a large number of samples within a metamorphic belt. … To improve and expedite the stress estimation procedure, we propose a numerical model that uses grain–shape data to calculate the relationship between the proportion of microboudinaged columnar grains (<i>p</i>) and the far–field differential stress (<i>σ</i><sub>0</sub>). …

    Journal of Mineralogical and Petrological Sciences 112(1), 25-30, 2017

    J-STAGE

  • 和時計から日本の歯車の源流を探る

    上田 昭夫 , 渡邉 淳 , 宮嵜 美弥子 , 久保 愛三 , 松岡 裕明

    … Tooth profile and pitch error were measured, and transmission error analysis was also performed. … Moreover, the gear material investigation was very interesting: The texture of the gear material was very homogeneous and grain size is far smaller than that of today's comparable steel kind. …

    日本機械学会論文集, 2017

    J-STAGE

  • SCG理論に基づく確率論的モデルによるセラミックスの強度と欠陥寸法の関係に及ぼす負荷速度の影響解析

    松田 伸也 , 黄木 景二

    … <p>This paper presents the effect of loading rate on relationship between strength and flaw size of ceramics. … First, a probabilistic effective inert strength model was proposed on the basis of SCG concept and upper limit flaw size in conjunction with the Weibull distribution. …

    日本機械学会論文集, 2017

    J-STAGE

  • 中性子・X線回折ラインプロファイル解析の最近の進歩

    友田 陽 , 佐藤 成男 , ステファヌス ハルヨ

    … Compared with deconvolutional methods like the classical Williamson-Hall method and the modified Warren-Averbach method combined with the modified Williamson-Hall plot, a recently developed convolutional multiple whole profile (CMWP) fitting method enables to provide the density, arrangement and character of dislocation and crystallite size reasonably. …

    鉄と鋼 103(2), 73-85, 2017

    J-STAGE

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