Search Results 1-20 of 2772

  • The Near Future of Synchrotron Radiation Operando Analysis : Development of Soft X-ray Absorption and Emission Spectroscopy for Functional Materials  [in Japanese]

    HARADA Yoshihisa

    Journal of the Japan Society for Precision Engineering 87(1), 34-38, 2021

    J-STAGE 

  • High Mobility Group Box-1 and Blood-Brain Barrier Disruption

    Nishibori Masahiro , Wang Dengli , Ousaka Daiki , Wake Hidenori

    … During the processes of inflammation, disruption of the blood–brain barrier (BBB) may play a critical role in the enhancement of inflammatory responses and may initiate brain damage because the BBB constitutes an interface between the brain parenchyma and the bloodstream containing blood cells and plasma. … Under physiological conditions, the BBB should function as an important element in the neurovascular unit (NVU). …

    Cells 9(12), 2650, 2020-12-10

    IR 

  • Analytical modeling of the interaction of an ultrasonic wave with a rough bone-implant interface

    Hériveaux Yoann , Nguyen Vu-Hieu , Biwa Shiro , Haïat Guillaume

    … Quantitative ultrasound can be used to characterize the evolution of the bone-implant interface (BII), which is a complex system due to the implant surface roughness and to partial contact between bone and the implant. … A good agreement with numerical results obtained through finite element simulation was obtained. … This model may be used for future finite element bone-implant models to replace the BII conditions. …

    Ultrasonics (108), 2020-12

    IR 

  • Second-harmonic generation of the lowest-order antisymmetric Lamb wave at a closed parallel crack

    Ye Tianming , Biwa Shiro , Mori Naoki

    … The closed crack is modeled as a spring-type interface with quadratic nonlinearity. … The reduced problems are solved by the finite element method in the frequency domain. …

    Journal of the Acoustical Society of America 148(4), 2073-2085, 2020-10

    IR 

  • MONTE CARLO SIMULATIONS ON MESO-SCALE HETEROGENEITY OF CONCRETE BY A DAMAGE MODEL  [in Japanese]

    SASAKI Hiromu , KATO Takumi , KURUMATANI Mao

    <p>本論文では，コンクリートのメゾスケールにおいて，粗骨材と破壊挙動の関係を統計的に検討することを目的として，粗骨材の粒径や分布性状を変化させたモンテカルロシミュレーションを実施した．破壊挙動のモデル化と数値解析には，異種材料による非均質性を反映可能な損傷モデルを適用し，メッシュ生成に要するコストを削減するとともに，試行回数を多くすることで，モンテカルロシミュレーションの高精度化を行 …

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 76(2), I_163-I_171, 2020

    J-STAGE 

  • Residual Stress Analysis of Dissimilar Weld Joint between CastIron Pipe and Steel Flange

    MURATA Tomohiro , OKANO Shigetaka , TSUTSUMI Shimpei , SAWADA Kenji , NAKAMOTO Koji , MOCHIZUKI Masahito

    … In the present study, a large-scale finite element analysis of welding thermal elastic-plastic behavior was conducted for the purpose of estimating the residual stress distribution at dissimilar welds between a cast-iron pipe and steel flange. … The results showed that tensile residual stress occurred along the interface between a cast-iron pipe and steel flange, regardless of the welding pass and heat input conditions. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(2), 144s-148s, 2020

    J-STAGE 

  • Change in Charpy Impact Toughness and Carbide Precipitation after Aging Heat Treatment of High Mn Austenitic Steel  [in Japanese]

    UEDA Keiji , IZUMI Daichi , ISHIDA Toshinori , YAMASHITA Takako , TAKADA Atsushi , IGI Satoshi , YAMASHITA Shotaro , OGURA Tomo , SAIDA Kazuyoshi

    … In some cases, Cr is added together with C as a solid solution strengthening element to the high-Mn austenitic steel. … As the results of both detailed microstructure observation of M23C6 and adjacent austenite matrix and DICTRA simulation, it was clarified that M23C6 mainly act as a fracture initiation point but propagation to the matrix becomes ductile because no sharp alloy deficiency layer is formed at the M23C6 / austenite matrix interface. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(4), 199-210, 2020

    J-STAGE 

  • Heat deformation analysis using a finite element model on gas pressure welding for steel bar  [in Japanese]

    ITOH Hajime , YAMAMOTO Ryu-ichi , SASAKI Tomohiro

    … Finite element model of gas pressure welding of steel bars is constructed in order to evaluate deformation behavior of the welded joint. … The proposed model revealed that tensile strain on the weld interface reaches larger value in the center than that in the outside of steel bar, depending on the temperature gradient. … It is considered that the temperature gradient on the weld interface is an important factor to control the deformation of gas pressure welded joint. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(4), 418-428, 2020

    J-STAGE 

  • Finite Element Study on Influence of Stent Deployment upon Mechanical Response of Coronary Artery

    KITAGAWA Haruna , SHIMIZU Ichiro , WADA Akira , NAKATANI Tatsuyuki , ZHAO Xinming , TAMURA Takashi

    … In the present study, we performed the axisymmetric finite element analysis, in which the stent was modeled as rigid struts while the three-layered coronary artery was modeled according to the mechanical properties reported by Holzapfel et al., and then, the influences of the strut cross-sectional shape, the strut width, and the distance between struts on the deformation and the stress in the artery were investigated. …

    Advanced Experimental Mechanics 5(0), 128-134, 2020

    J-STAGE 

  • Influence of post heat treatment on Interfacial Strength of Plasma-sprayed Hydroxyapatite Coatings  [in Japanese]

    OHKI Motofumi , JINNAI Ran , HOSHINA Toshiki , KITADAI Syoto , YUMOTO Kota , SATOH Hiroshi

    … Finally, the magnitude of thermal stress caused by cooling after thermal spraying was estimated from the heat transfer - static structure coupled analysis by a general-purpose finite element method program. … As the results, a correlation between post heat treatment temperature and interface strength was shown. …

    The Proceedings of Conference of Hokuriku-Shinetsu Branch 2020.57(0), R012, 2020

    J-STAGE 

  • Lap Joining of Titanium to Galvanized Steel by Cold Metal Transfer Technology

    Chang Jinghuan , Yan Yingjie , Cao Rui

    … The results show that an interface reaction layer with Ti–Fe intermetallics was produced between the titanium base metal and weld metal, even when a 2 mm offset distance of the welding torch towards the steel base metal was set. … It is attributed to the vaporization of the zinc coating, Zn element doesn't react with Fe and Ti elements in the weld metal. … The joints were fractured at the Ti–Fe interface reaction layer. …

    MATERIALS TRANSACTIONS 61(12), 2312-2319, 2020

    J-STAGE 

  • COUNTERMEASURE EFFECT OF UHPFRC OVERLAY ON FATIGUE CRACKS PROPAGATING FROM U-RIB WELDS OF ORTHOTROPIC STEEL DECKS  [in Japanese]

    HATTORI Masafumi , TATEISHI Kazuo , HANJI Takeshi , SHIMIZU Masaru

    <p>　本論文は，鋼床版のUリブとデッキプレートの溶接部から生じる疲労き裂のうち，溶接ルートを起点としてデッキプレートへ進展する疲労き裂を対象として，超高性能繊維補強セメント系複合材料の敷設による疲労対策の効果と，その対策自体の疲労耐久性について検討したものである．具体的には，輪荷重走行試験および有限要素解析により，疲労き裂に対する進展抑制効果，敷設した材料やデッキプレートとの界面の疲 …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 76(3), 542-559, 2020

    J-STAGE 

  • Direct Numerical Simulation Techniques for Fluid-Structure Interactions  [in Japanese]

    SAWADA Tomohiro

    … One is the interface-tracking (IT) method that suits for computation of FSIs of which computation accuracy of the boundary layer is important, and the other is the interface-capturing (IC) method that is suitable for FSIs with large deformation and multi-body coupled problems. …

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 65(11), 672-677, 2020

    J-STAGE 

  • Parallelization of DEM simulation on distributed-memory computer via three-dimensional slice grid method

    YOKOO Kento , KISHIDA Masahiro , YAMAMOTO Tsuyoshi

    … Numerical simulation via the discrete element method is useful for solving these problems because the motion of each bed and dust particle is demonstrated. … In the packed particle system, linear speed-up was obtained at particle number of 100 million and a message passing interface-process number of 1024. …

    Mechanical Engineering Letters 6(0), 20-00444-20-00444, 2020

    J-STAGE 

  • Interface Characteristics of GCr15/45 Carbon Steel Composite Billet Produced by Electroslag Remelting Cladding

    Cao Yulong , Li Guangqiang , Jiang Zhouhua , Dong Yanwu , Zhao Zhengrong , Niu Chenrui

    … <p>In the present study, a GCr15/45 carbon steel composite billet is manufactured by the new electroslag remelting cladding (ESRC) method and a systematic analysis of the interface characteristics including the bonding state, element transition, microstructure evolution and tensile strength is carried out. … It illustrates that an appropriate smelting power is beneficial to obtain a metallurgical bonding interface. …

    MATERIALS TRANSACTIONS 61(11), 2228-2235, 2020

    J-STAGE 

  • Modelling and Analysis of Tool Edge Chipping at the Initial Stage of Interrupted Turning Considering the Effects of the Adhesion  [in Japanese]

    YAMAGA Kyosuke , FUJITA Haruto , TAKAHASHI Yukio , SONG Xiaoqi , IHARA Tohru

    … The stable adhesion formed at the tool-chip interface has the tool edge protective effect. … Paul's stress criterion and finite element method (FEM). …

    Journal of the Japan Society for Precision Engineering 86(10), 830-834, 2020

    J-STAGE 

  • A METHOD FOR SIMULATING THREE-PHASE MESO-STRUCTURE OF CONCRETE USING DAMAGE MODEL  [in Japanese]

    KATO Takumi , RYUTO Masayuki , KURUMATANI Mao

    <p>　本論文では，メゾスケールにおけるコンクリートの破壊挙動を再現することを目的として，界面での脆弱性を考慮した損傷モデルを定式化し，それを用いた破壊シミュレーションの妥当性および有効性を示す．提案手法の特徴は，材料境界に沿ってメッシュ生成を行う必要がなく，要素内における各材料の体積率を用いて，脆弱な界面を有する非均質材料の破壊挙動を再現できることである．数値解析例において，まず1次 …

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 76(1), 38-47, 2020

    J-STAGE 

  • Investigation of Refractory Corrosion by Na<sub>2</sub>O–B<sub>2</sub>O<sub>3</sub> Flux and Its Ability of Dissolving of Mn Oxides during a Melting Process for a Copper Alloy in the Atmosphere, Including Mn as Easily Oxidized Element

    Hasegawa Itaru , Koizumi Takuya , Suzuki Masanori , Tanaka Toshihiro

    … However, in the refractory/flux interface no clear formation of the compound layer could be confirmed due to the reaction between the refractory's constituents and the flux. …

    MATERIALS TRANSACTIONS 61(9), 1820-1828, 2020

    J-STAGE 

  • Effects of Nitrogen Gas Pressure on the Solidification Parameters and As-cast Microstructure Revolution during Pressurized Electroslag Remelting AISI 304 Stainless Steel

    Yu Jia , Liu Fubin , Jiang Zhouhua , Li Huabing , Kang Congpeng , Zhang Wenchao , Wang Ao , Geng Xin

    … With an approximately equal melting rate, the variation of solidification parameters is dependent on the competition between the heat transfer rate at the slag/pool interface and the ingot/mould interface, because increasing the nitrogen gas pressure could simultaneously increase the two heat transfer rates. …

    ISIJ International 60(8), 1684-1692, 2020

    J-STAGE 

  • Numerical Simulation of a Rising Bubble in a Shear-Thinning Fluid under Pressure-Oscillating Field  [in Japanese]

    Ito Shunsaku , Iwata Shuichi , Nagumo Ryo , Mori Hideki

    … In this study, unsteady-state non-Newtonian finite element analysis is performed, in which the shape of the air-liquid interface can be determined by the force balance equation, considering inertia and the gravitational term. …

    Nihon Reoroji Gakkaishi 48(3), 145-151, 2020

    J-STAGE 

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