Search Results 1-20 of 274

  • Evaluation of a splice-type crack arrester in a foam core sandwich panel under mode II-type loading

    Hirose Yasuo , Matsuda Hirokazu , Hojo Masaki , Yoshida Keishiro

    … The splice-type arrester was intended to provide crack suppression functionality to a core-core splice of a foam core sandwich panel via the installation of carbon-fiber-reinforced plastic (CFRP) material between the two tapered cores and the replacement of sharp core edges with CFRP. …

    Materials System 38(0), 11-19, 2021

    J-STAGE 

  • Understanding the Anomalous Discontinuous Precipitation in Cu-Ni-X (X = Co,Fe) Alloys Based on CALPHAD Method and Phase-Field Simulation  [in Japanese]

    Goto Jundai , Koyama Toshiyuki , Tsukada Yuhki

    … <p>The anomalous discontinuous precipitation which is called "Cellular Decomposition (CD)" has been observed in Cu-Ni-X (X = Co,Fe) ternary systems, i.e., the precipitate morphology in cell region is a nanoscale fine fiber, the direction of the fibers does not take specific crystal orientation, and the morphology is wavy. … In this study, we elucidated the reason why such an unusual cellular decomposition occurs by means of the Calphad method and phase-field simulations. …

    Journal of the Japan Institute of Metals and Materials 85(3), 89-94, 2021

    J-STAGE 

  • Evaluation of transverse crack initiation of cross-ply CFRP laminates subjected to very high cycle fatigue loading  [in Japanese]

    MIYAKOSHI Tsuyoshi , ATSUMI Takeru , KOSUGI Kensuke , HOSOI Atsushi , TSUDA Terumasa , SHIMAMURA Yoshinobu , KAWADA Hiroyuki

    … <p>Carbon fiber reinforced plastics (CFRPs) are expected to be applied for rotating members such as fan blades of turbofan engines. … They are subjected over 108 loading cycles during their operation time, since it is essential to investigate the very high cycle fatigue (VHCF) behavior of CFRPs. … To accelerate the test time up to VHCF regime, ultrasonic fatigue testing machine which can apply the specimen ultrasonic load at a frequency of 20 kHz was used. …

    The Proceedings of Conference of Kanto Branch 2020(0), 16A03, 2020

    J-STAGE 

  • Dispersibility of Reinforcing Fiber in Rubber-Composite Material  [in Japanese]

    YAMAZAKI Kiyoyasu , ARA Shingo , MURAYOSHI Hiroaki , IIZUKA Hiroshi

    The Proceedings of Conference of Hokuriku-Shinetsu Branch 2020.57(0), Q013, 2020

    J-STAGE 

  • High-Speed Silicon Optical Modulators  [in Japanese]

    OGAWA Kensuke

    … High-speed silicon optical modulators are reviewed with respect to applications of optical signalgeneration in two major modulation formats in optical-fiber telecommunications: on-off keying as acommon modulation format in commercialized 10-Gbit/s optical-fi ber networks and quadrature phaseshiftkeying as an advanced modulation format in cutting-edge 64-Gbit/s and 128-Gbit/s coherentoptical-fiber networks. …

    The Review of Laser Engineering 42(3), 229, 2020

    J-STAGE 

  • Random Loading Fatigue Life of Injection Molded Short Carbon Fiber Reinforced Composite and Its Prediction  [in Japanese]

    Yamauchi Sara , KAWAI Masamichi

    … Random loading fatigue life of an injection molded short carbon fiber reinforced thermoplastic composite, CF/PA6, has been examined for each of different orientations oblique from the direction of molten flow direction. … Two kinds of spectrum loading tests are performed. …

    The Proceedings of Ibaraki District Conference 2019.27(0), 810, 2019

    J-STAGE 

  • Notched Fatigue Life Prediction for Short Carbon Fiber Reinforced Polyamide Stampable Sheet Composite  [in Japanese]

    KOBAYASHI Keita , KAWAI Masamichi

    … Notched fatigue behavior of a stampable short fiber reinforced polyamide composite material was investigated. … In addition, development of an engineering prediction methodology was attempted. … From the static tests performed, it was found that the notch sensitivity of the composite can accurately be predicted by the notch sensitivity model for both in tension and compression. …

    The Proceedings of Ibaraki District Conference 2019.27(0), 811, 2019

    J-STAGE 

  • Evaluation of transverse crack propagation behavior of cross-ply CFRP laminates in VHCF regime using ultrasonic fatigue testing  [in Japanese]

    ATSUMI Takeru , MIYAKOSHI Tsuyoshi , KOSUGI Kensuke , HOSOI Atsushi , SHIMAMURA Yoshinobu , TSUDA Terumasa , KAWADA Hiroyuki

    … <p>For further application of carbon fiber reinforced plastics (CFRPs), it is necessary to obtain fatigue properties up to very high-cycle fatigue (VHCF) regime. … cycle using an ultrasonic fatigue test machine in order to evaluate the transverse crack initiation life of laminates and the propagation behavior. …

    The Proceedings of the Materials and processing conference 2019.27(0), 121, 2019

    J-STAGE 

  • On Fatigue Strength Evaluation Method Based on Micro Stress of Unidirectional Reinforced CFRP Specimen  [in Japanese]

    MINO Yousuke , MORITA Naoki , YOSHIKAWA Nobuhiro

    … <p>A methodology evaluating the fatigue strength of Carbon Fiber Reinforced Plastic (CFRP) has been investigated in terms of Interfacial Normal Stress (INS), which is evaluated through the micro-scale finite element analysis handling carbon fibers and resin separately. … The INS is defined as normal stress on the plane that is normal to the minimum length segment connecting central axes of conterminous two carbon fibers. …

    The Proceedings of the Materials and Mechanics Conference 2019(0), OS2107, 2019

    J-STAGE 

  • Vibration characteristics identification and FE modeling of a GFRP truss pedestrian bridge  [in Japanese]

    Hayashi Gen , Goi Yoshinao , Kim Chul-Woo , Sugiura Kunitomo

    … <p>This paper presents the results of a real bridge field experiment, carried out on a glass fiber reinforced polymer (GFRP) pedestrian truss bridge of which nodes are reinforced with stainless steel plates. … The aim of this paper is to identify the modal properties of this bridge by using both conventional techniques and a model updating algorithm. …

    Journal of Structural Engineering, A 65A(0), 317-328, 2019

    J-STAGE 

  • Development of Press Molding Preform Design and Fabrication Method with Unfolded Diagram for CFRP

    Ikari Tatsuki , Tanaka Hidetake

    … <p>In this study, a novel design and fabrication method that corresponds to simple and optimized press molding for carbon fiber reinforced plastics (CFRP) is proposed based on CAD data. … Specifically, in recent years, CFRP has been widely used for weight reduction of transportation equipment. … However, optimization of the production process is required to expand the range of applications of CFRP. …

    International Journal of Automation Technology 13(2), 301-309, 2019

    J-STAGE 

  • Changes in the Higher-Order Structure of Silk Fibers Obtained by Forcibly Spinning as Compared to Those Obtained by the Naturally Spinning System of the<i> Bombyx mori</i> Silkworm

    Kawahara Yutaka , Yoshioka Taiyo , Tashiro Kohji

    … silkworm larvae, and the higher-order structure of the as-spun filaments was analyzed by Fourier-transform infrared spectroscopy (FT-IR) and wideangle X-ray diffraction (WAXD). … The FT-IR spectra of the as-spun filaments were similar to those of naturally spun cocoon filaments. … This indicated that the forcibly spun filaments were comprised of <i>β</i>-sheets. …

    Journal of Fiber Science and Technology 75(1), 001-008, 2019

    J-STAGE 

  • Development of Press Molding Preform Design and Fabrication Method with Unfolded Diagram for CFRP:―Fundamental Molding Experiment Using Tow Prepreg―  [in Japanese]

    IKARI Tatsuki , TANAKA Hidetake

    … <p>In the study, a novel design and fabrication method which is simple, optimized press molding for CFRP on the basis of CAD data is proposed. … CFRP has been widespread use for the purpose of weight reduction of transportation equipment in recent years. … However, in order to expand range of purpose, reduction of production is required. …

    Journal of the Japan Society for Precision Engineering 85(1), 119-124, 2019

    J-STAGE 

  • Probabilistic CLD (constant life diagram) approach for prediction of P-S-N curves for stampable short carbon fiber-reinforced polyamide composites  [in Japanese]

    ANKAI Masaki , KAWAI Masamichi

    … <p>The statistical distributions of fatigue life data of stampable CF/PA composite at different stress ratios are identified, and a procedure for predicting the S-N relationships for any stress ratios that consider the influence of probability of failure P is proposed. … To identify the statistical nature of fatigue life, a lognormal distribution and a Weibull distribution are applied to the fatigue data obtained, respectively. …

    The Proceedings of the Materials and Mechanics Conference 2018(0), OS0707, 2018

    J-STAGE 

  • Molecular Dynamics Study of Kumihimo Carbon Fiber Composed of Diamond Nanothreads  [in Japanese]

    FUJIBAYASHI Suihei , LEI Xiao-Wen , NAKATANI Akihiro

    … <p>Nano carbon materials are attracting a great deal of attention, and a new material diamond nanothreads (DNT) is discovered in 2014. … On the other hand, Kuimihimo is one of the traditional Japanese culture. … Therefore, we just think of combination the latest material with Japanese traditional technology. … Using molecular dynamics methods, we analyze the braiding of three DNTs and do the tensile test for them. …

    The Proceedings of the Materials and Mechanics Conference 2018(0), OS0205, 2018

    J-STAGE 

  • Prediction of P-S-N curves for short carbon fiber-reinforced polyamide composites at different stress ratios  [in Japanese]

    ANKAI Masaki , KAWAI Masamichi

    … The statistical distributions of fatigue lives of stampable CF/PA composite at different stress ratios are identified, and a procedure for predicting the S-N relationships for any stress ratios that consider the influence of the probability of failure <i>P</i> … To identify the statistical nature of fatigue life data, a lognormal distribution and a Weibull distribution are applied to the fatigue data obtained, respectively. …

    The Proceedings of Ibaraki District Conference 2018.26(0), 807, 2018

    J-STAGE 

  • Study on 3D metal craft by fusing Japanese traditional origami technology and sheet metal technology  [in Japanese]

    TAKAHASHI Kazuhide

    … Complicated sheet metal development diagram has some points in common with Japanese traditional origami technology. …

    RESEARCH REPORTS OF NATIONAL INSTITUTE OF TECHNOLOGY, HAKODATE COLLEGE 52(0), 111-124, 2018

    J-STAGE 

  • Fiber-Based Learning about Clothing  [in Japanese]

    MASUBUCHI Satoko , MATSUDA Miho , MORITA Miyuki

    … <p>  We administered a questionnaire survey to clarify the degree of university students' … In addition, we also presented a Structural Diagram intended to deepen children's understanding of the nature of fibers. …

    Journal of Home Economics of Japan 68(11), 588-597, 2017

    J-STAGE 

  • EFFECTS OF MIXING RATIO ON UNCONFINED COMPRESSIVE BEHAVIOR OF FIBER REINFORCED MIXTURE OF SOIL AND STEELMAKING SLAG  [in Japanese]

    YANAGIBASHI Tomokazu , TANAKA Yuichi , TSUTSUMI Ayato , MATSUMURA Satoshi , MIZUTANI Takaaki , MORIKAWA Yoshiyuki

    短繊維・製鋼スラグ混合土の材料特性を明らかにするために,様々な配合条件で一軸圧縮試験を実施し,配合条件が変形挙動に及ぼす影響を検討した.短繊維・製鋼スラグ混合土の変形挙動はポストピーク領域において短繊維の影響を強く受け,破壊モードが変化することがわかった.これらの破壊モードは「I.脆性破壊型」「II.安定破壊型」「III.延性破壊型」「IV.ひずみ硬化型」の4つに分類され,各実験ケースに照らし合わ …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 73(2), I_336-I_341, 2017

    J-STAGE 

  • Adhesive Fatigue Test on Rehabilitated Steel Beam Bonding CFRP Plates. Part2 Investigate the Yield Condition in the Adhesive Fatigue Limit  [in Japanese]

    玉井 宏章 , 御厨 健太 , 國廣 智志

    … The authors have developed a tensile force strengthening method using bonded carbon fiber reinforced plastic (CFRP) plate to enhance the life of existing building.In this study, performs dynamic fatigue tests on rehabilitated steel beam bonding CFRP plates to reveal fatigue properties of the adhesive and examines fatigue fracture properties of adhesive on cyclic loading. …

    長崎大学大学院工学研究科研究報告 = Reports of Graduate School of Engineering, Nagasaki University 46(87), 28-34, 2016-07

    IR 

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