研究者詳細 - 吉村　彰記

論文 - 吉村　彰記

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X-ray computed tomography used to measure fiber orientation in CFRP laminates 査読有り

A. Yoshimura, R. Hosoya, J. Koyanagi, T. Ogasawara

Advanced Composite Materials 25 巻 ( 1 ) 頁： 19-30 2016年1月

CFRPアブレータの急速加熱時に生じる局所面外変形査読有り

小柳潤, 福田泰大, 米山聡, 平井研一, 吉村彰記, 青木卓哉, 小笠原俊夫

日本複合材料学会誌 42 巻 ( 4 ) 頁： 146-152 - 152 2016年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人日本複合材料学会

Local out-of-plane deformation of CFRP ablator subjected to very rapid heating was investigated in this study. The local out-of-plane deformation is measured by three dimensional digital image correlation (3D-DIC) technique. The 3D-DIC at high temperature is achieved by high-temperature resistance random pattern on specimen surface using ceramic bond and blue filter intended for cutting strong infrared radiation from the specimen. Then discussed the mechanism of the local out-of-plane deformation only at the rapid heating condition, in terms of carbonization, pyrolysis gas occurrence, gas pressure storage and interlaminar debonding due to the gas pressure in this study.

DOI： 10.6089/jscm.42.146

Further investigation of Delamination Reduction Trend for stitched composites 査読有り

Tan K. T., Yoshimura A., Watanabe N., Iwahori Y., Ishikawa T.

COMPOSITES SCIENCE AND TECHNOLOGY 118 巻頁： 141-153 2015年10月

Damage simulation of stitched CFRP laminates under high-velocity projectile impact 査読有り

Yoshimura A.

ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) 1-2015 巻 2015年

電動モータグライダシステムのモータマウント強度試験

吉村彰記, 平野義鎭, 西沢啓

JAXA research and development memorandum 14 巻 ( 007 ) 頁： 1-24 2015年

Titanium alloy foil-inserted carbon fiber/epoxy composites for cryogenic propellant tank application 査読有り

T. Ogasawara, N. Arai, R. Fukumoto, T. Ogawa, T. Yokozeki, A. Yoshimura

Advanced Composite Materials 23 巻 ( 2 ) 頁： 129-149 2014年3月

Evaluation of Spaceborne SiC Mirror Materials Using Samples Cut from the Periphery of a Mirror Body 査読有り

Kotani Masaki, Muta Yoshikazu, Yoshimura Akinori, Ogihara Shinji, Imai Tadashi, Katayama Haruyoshi, Yui Yukari, Tange Yoshio, Enya Keigo, Kaneda Hidehiro, Nakagawa Takao

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 23 巻 ( 3 ) 頁： 850-858 2014年3月

Characterization of high-velocity impact damage in CFRP laminates: Part II - Prediction by smoothed particle hydrodynamics 査読有り

Yashiro S.

Composites Part A: Applied Science and Manufacturing 56 巻頁： 308 - 318 2014年

X線CT画像を用いたCFRP積層板の繊維方向測定査読有り

吉村彰記, 細谷亮平, 小柳潤, 小笠原俊夫

日本複合材料学会誌 40 巻 ( 4 ) 頁： 146-152 2014年

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（学術雑誌）

In this paper a new method which measures fiber orientation in CFRP laminates from X-ray CT images is proposed. In the proposed method, fiber orientation is analyzed by applying digital image correlation method (DIC) to the acquired tomographic images. By using DIC, brightness pattern, which results from radiodensity difference between fiber and resin, is compared between two different planes in thickness direction. Then three dimensional displacement of brightness pattern, which indicates fiber orientation, can be measured. In this study, we applied the proposed method to a quasi-isotropic CFRP laminate. After X-ray CT imaging, the sample was sectioned and polished. Fiber orientation was then experimentally measured by using a microscope. Fiber orientation calculated by the proposed method agrees very well with experimentally measured one, and the validity of the proposed method was demonstrated. Additionally, we applied the proposed method to a plane-woven CFRP laminate. The result revealed that the invalid fiber orientation may be calculated for the fiber orientation is parallel to the plane of CT image, or for the fiber orientation is calculated using the pattern around the outer edge of CT images.

DOI： 10.6089/jscm.40.146

複合材料構造接着接合部の破壊シミュレーション

吉村彰記

日本接着学会誌 50 巻 ( 5 ) 頁： 179-184 2014年

Effect of stitch density and stitch thread thickness on damage progression and failure characteristics of stitched composites under out-of-plane loading 査読有り

Tan K. T., Yoshimura A., Watanabe N., Iwahori Y., Ishikawa T.

COMPOSITES SCIENCE AND TECHNOLOGY 74 巻頁： 194-204 2013年1月

Development of High-Performance CFRP Flywheel 査読有り

KOYANAGI Jun, HOJO Masahiro, YOSHIMURA Akinori, YONEYAMA Satoru, SUSUKI Ippei

Journal of Solid Mechanics and Materials Engineering 7 巻 ( 3 ) 頁： 426-438 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）

This paper reports state of progress for development of high-performance CFRP flywheel. For the development, high specific energy density and durability are required. A new fabricating method suggested in our previous work (Mechanics of Time-Dependent Materials 2012) is employed for the CFRP flywheel. According to the method the fabricated flywheel does not have radial stress and the ultimate failure is dominated by hoop stress. A spin test is conducted for the fabricated CFRP flywheel. Strain gauge and digital image correlation methods are employed for the rotational strain measurement. The both methods verify very little rotational radial strain, which means the radial stress is also little. As a first step of the development of high-performance CFRP flywheel, the feasibility of no-radial stress flywheel fabrication is indicated by this study.

DOI： 10.1299/jmmp.7.426

Characterization of high-velocity impact damage in CFRP laminates: Part i - Experiment 査読有り

Yashiro S.

Composites Part A: Applied Science and Manufacturing 48 巻 ( 1 ) 頁： 93 - 100 2013年

液体窒素浸漬試験による複合材料製極低温推進剤タンクの熱応力軽減設計の検証

吉村彰記, 小笠原俊夫, 末益博志

JAXA research and development memorandum 12 巻 ( 012 ) 頁： 1-12 2013年

Interlaminar fracture toughness of 5 harness satin woven fabric carbon fiber/epoxy composites 査読有り

[36] T. Ogasawara, A. Yoshimura, T. Ishikawa, R. Takahashi, N. Sasaki, T. Ogawa

Advanced Composite Materials 21 巻 ( 1 ) 頁： 45-56 2012年10月

Fracture toughness of CFRP adhesive bonded joints at cryogenic temperature 査読有り

A. Yoshimura, T. Takaki, Y. Noji, T. Yokozeki, T. Ogasawara, S. Ogihara

Journal of Adhesion Science and Technology 26 巻 ( 7 ) 頁： 1017-1031 2012年4月

Effect of fiber arrangement on shape fixity and shape recovery in thermally activated shape memory polymer-based composites 査読有り

M. Nishikawa, K. Wakatsuki, A. Yoshimura, N. Takeda

Composites Part A: Applied Science and Manufacturing 43 巻 ( 1 ) 頁： 165-173 2012年1月

柔軟体衝突を受けるCFRP積層板の損傷解析査読有り

駒形大輔, 岡部朋永, 矢代茂樹, 吉村彰記, 小笠原俊夫

日本複合材料学会誌 = Journal of the Japan Society for Composite Materials 37 巻 ( 5 ) 頁： 164-171 2011年9月

記述言語：日本語掲載種別：研究論文（学術雑誌）

The application of composite laminates to fan blade of turbofan engine is demanded in order to reduce the fuel cost and the noise of aircrafts. Bird strike is one of the most important problems in the engineering application of fan blades. However, the soft-body impact damage on the composite laminates under high-velocity impact has not been clarified sufficiently due to their complexity. Therefore, it is necessary to understand the damage process of the composite materials under the soft-body impact. The current work presented the numerical simulation for soft-body impact using the SPH method to address the large deformation problem, and discussed the change of the failure mode of the composite laminates as a function of impact velocity. Especially, in order to simulate the realistic damage process in composite laminates, a novel approach for the separation of particles was introduced to the model. We confirmed that the numerical simulation was applicable in the soft-body impact problem by the agreement of contact pressure with the experimental results. Moreover, it was shown that the catastrophic failure of the composite laminates by the soft-body impact could be also predicted using this numerical simulation.

DOI： 10.6089/jscm.37.164

Three-dimensional measurement of CFRP deformation during high-speed impact loading 査読有り

Yamada Masayoshi, Tanabe Yasuhiro, Yoshimura Akinori, Ogasawara Toshio

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 646 巻 ( 1 ) 頁： 219-226 2011年8月

極低温環境下におけるCFRP接着接合のモードII破壊靱性査読有り

吉村彰記, 野路陽平, 小笠原俊夫, 横関智弘, 荻原慎二

日本複合材料学会誌 = Journal of the Japan Society for Composite Materials 37 巻 ( 4 ) 頁： 130-137 2011年7月

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（学術雑誌）

In the present paper, end notched flexure (ENF) tests are conducted for CFRP/CFRP, CFRP/aluminum sheet adhesive bonded specimens at room temperature (296 K), at low temperature (223 K) and at cryogenic temperature (77 K) in order to investigate the mode II adhesive fracture toughnesses. Large difference of the coefficients of thermal expansion (CTE) between the CFRP and the aluminum sheet derives considerable thermal stress at the cryogenic temperature. Therefore, in the ENF tests, the effect of thermal stress must be considered. In the present paper, first the effect of thermal deformation is analytically discussed, and ENF tests are then carried out. The test results reveal that the fracture toughness is much higher at the low temperature than at the room temperature. However, the toughness is significantly lower at the cryogenic temperature than at the low temperature. Moreover, the results show that the crack extends in the adhesive film (cohesive failure) at the room and the low temperatures, whereas it extends at the interface between adhesive film and CFRP (adhesive failure) at the cryogenic. These results imply that the transition of the crack surface caused the degraded adhesive fracture toughness.

DOI： 10.6089/jscm.37.130

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