研究者詳細 - 吉村　彰記

論文 - 吉村　彰記

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Numerical investigation of damage propagation of woven composite using decoupled multi-scale method 査読有り

C. Hoshikawa, A. Yoshimura, K. Goto, M. Arai

Mechanical Engineering Journal 11 巻 ( 4 ) 頁： 24-00012 2024年8月

Identification of interfacial strength between carbon fiber and epoxy matrix in CFRP laminates using pulse laser spallation method 査読有り

M. Arai, R. Nakamura, H. Katayama, K. Goto, A. Yoshimura, H. Ito

Advanced Composite Materials 34 巻 ( 2 ) 頁： 220 - 228 2024年7月

Fracture mechanism of carbon fiber-reinforced thermoplastic composite laminates under compression after impact 招待有り査読有り

Journal of Composite Materials 頁： Accepted 2024年3月

面外引張／せん断組合せ応力試験によるクロスプライCFRP積層板の層間強度評価招待有り査読有り

榎本匠, 後藤圭太, 荒井政大, 吉村彰記

日本複合材料学会誌 49 巻 ( 6 ) 頁： 183 - 190 2023年11月

CFRP内ボイドがTalbot-Lau干渉計暗視野画像に及ぼす影響招待有り査読有り

浅野圭亮, 吉村彰記, 荒井政大, 後藤圭太, 有本直

日本複合材料学会誌 49 巻 ( 6 ) 頁： 199 - 207 2023年11月

Experimental Evaluation of Fatigue Properties of Carbon Fiber/Epoxy Matrix Interface and Numerical Simulation of Transverse Cracking under Cyclic Load 査読有り

Y. Kitagawa, K. Sasaki, M. Arai, A. Yoshimura, K. Goto

Advanced Composite Materials 33 巻 ( 2 ) 頁： 212 - 232 2023年6月

極低温におけるCFRP サンドイッチ構造発泡コアの引張特性査読有り

小林充, 吉村彰記, 後藤圭太, 荒井政大

日本複合材料学会誌 49 巻 ( 3 ) 頁： 75 - 81 2023年5月

In situ optical observation of damage and failure process in adhesively bonded CFRP joints under mixed-mode loading 査読有り

S. Oshima, T. Mikami, A. Yoshimura, Y. Hirano, T. Ogasawara

Composite Structures 305 巻頁： 116453 2023年2月

内部構造を考慮した非連続CFRTPのマルチスケール解析査読有り

後藤圭太，宮島雅治, 小林嶺太, 荒井政大, 吉村彰記

日本複合材料学会誌 48 巻 ( 5 ) 頁： 201 - 210 2022年11月

Prediction of transverse crack multiplication of CFRP cross-ply laminates under tension-tension fatigue load 査読有り

Y. Kitagawa, M. Arai, A. Yoshimura, K. Goto

Advanced Composite Materials 32 巻 ( 3 ) 頁： 419 - 436 2022年8月

CFRPの衝撃貫通試験と残留引張強度評価査読有り

板倉知巳, 後藤圭太, 荒井政大, 吉村彰記

日本機械学会論文集 88 巻 ( 910 ) 頁： 1 - 13 2022年6月

Performance assessment for fiber tracking of unidirectional carbon fiber reinforced plastic by digital image correlation of X-ray computed-tomography 査読有り

S. Morita, M. Ueda, T. Takahashi, K. Kajiwara, A. Yoshimura, N. Sugiura

Advanced Composite Materials 32 巻 ( 1 ) 頁： 35 - 47 2022年5月

Experimental and numerical evaluation of effects of kidney-shape carbon fiber on transverse cracking of carbon fiber reinforced plastics 招待有り査読有り

Y. Kitagawa, A. Yoshimura, M. Arai, K. Goto, N. Sugiura

Composites Part A 152 巻頁： 106690 2021年10月

Inverse analysis of interlaminar strength in CFRP laminates using pulse laser spallation method 査読有り

M. Arai, T. Chiba, K. Goto, A. Yoshimura

Composites Science and Technology 241 巻頁： 108938 2021年7月

CFRP発泡コアサンドイッチ構造の極低温環境下における機械的特性査読有り

小林充, 神鳥哲, 吉村彰記, 後藤圭太, 荒井政大

日本複合材料学会誌 47 巻 ( 4 ) 頁： 150 - 158 2021年7月

積層構成最適化による繊維配向角誤差に起因するCFRP積層板の面外熱変形抑制査読有り

田中駿, 荒井政大, 後藤圭太, 吉村彰記, 池田忠繁

日本複合材料学会誌 47 巻 ( 4 ) 頁： 159 - 167 2021年7月

Effect of material nonlinearity on the toughness evaluation in quasi-static mode II interlaminar fracture toughness tests of composite laminates 査読有り

S. Yashiro, T. Yamasaki, H. Nagai, A. Yoshimura

Engineering Fracture Mechanics 253 巻頁： 107879 2021年7月

Relation between Dark-field Images Derived using X-Ray Talbot-Lau Interferometer and Carbon Fiber Distribution in CFRP 査読有り

Y. Kasai, A. Yoshimura, M. Arai, K. Goto, A. Yamanaka, H. Shindo

Advanced Composite Materials 30 巻 ( 6 ) 頁： 591 - 604 2021年4月

Experimental and numerical study on progressive damage and failure in composite laminates during open-hole compression tests 査読有り

R. Higuchi, S. Warabi, A. Yoshimura, T. Nagashima, T. Yokozeki, T. Okabe

Composites Part A 145 巻頁： 106300 2021年3月

X線Talbot-Lau干渉計画像とCFRP中の炭素繊維分布の関係査読有り

笠井雄介, 吉村彰記, 荒井政大, 後藤圭太, 山中淳彦, 進藤浩通

日本複合材料学会誌 47 巻 ( 1 ) 頁： 11-19 2021年1月

High-speed observation of bending fracture process of carbon fiber reinforced plastic composite/NomexTM honeycomb sandwich panel 査読有り

T. Ogasawara, H. Yoshinaga, M. Oiwa, T. Oguri, T. Matsuda, H. Kusano, A. Yoshimura

Journal of Sandwich Structures and Materials 23 巻 ( 6 ) 頁： 1987 - 1999 2020年2月

Experimental and analytical validation of mode II fracture toughness tests for a type of double-lap joint 査読有り

S. Oshima, A. Yoshimura, S. Yashiro, Y. Hirano, T. Ogasawara

Composite Structures 234 巻頁： 111757 2020年2月

In-situ observation of microscopic damage in adhesively bonded CFRP joints under mode I and mode II loading 査読有り

S. Oshima, A. Yoshimura, Y. Hirano, T. Ogasawara, Kwek-Tze Tan

Composite Structures 227 巻 2019年8月

Simulation on kink-band formation during axial compression of a unidirectional carbon fiber-reinforced plastic constructed by X-ray computed tomography images

T. Takahashi, M. Ueda, K. Iizuka, A. Yoshimura, T. Yokozeki

Advanced Composite Materials 28 巻 ( 4 ) 頁： 347-363 2019年7月

X線コンピュータ断層撮影画像より構築した一方向炭素繊維強化プラスチックの3次元有限要素モデルを用いた繊維方向圧縮負荷におけるキンクバンドの形成シミュレーション査読有り

髙橋拓也, 上田政人, 飯塚啓輔, 吉村彰記, 横関智弘

日本複合材料学会誌 45 巻 ( 2 ) 頁： 52-60 2019年3月

Development of a three-dimensional finite element model for a unidirectional carbon fiber reinforced plastic based on X-ray computed tomography images and the numerical simulation on compression 査読有り

K. Iizuka, M. Ueda, T. Takahashi, A. Yoshimura, M. Nakayama

Advanced Composite Materials 28 巻 ( 1 ) 頁： 73-85 - 85 2019年1月

A Numerical simulation of delamination caused by internal gas pressure for mid-density CFRP 査読有り

J. Koyanagi, K. Shinba, Y. Fukuda, K. Hirai, A. Nakazato, A. Yoshimura, T. Aoki and Y. Kogo

Composites Part A: Applied Science and Manufacturing 115 巻頁： 255-263 2018年12月

High fidelity simulation of low velocity impact behavior of CFRP laminate 査読有り

Ebina Masaya, Yoshimura Akinori, Sakaue Kenichi, Waas Anthony M.

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING 113 巻頁： 166-179 2018年10月

Experimental method for mode I fracture toughness of composite laminates using wedge loaded double cantilever beam specimens 査読有り

S. Oshima, A. Yoshimura, Y. Hirano, T. Ogasawara

Composites Part A: Applied Science and Manufacturing 112 巻頁： 119-125 2018年9月

A new approach for evaluating crack growth resistance curve of mode II delamination by doubly end-notched tension tests 査読有り

S. Yashiro, T. Agata, A. Yoshimura

Advanced Composite Materials 27 巻 ( 2 ) 頁： 119-133 2018年3月

二重端面切欠き引張試験による複合材料積層板のモードII 層間破壊じん性評価法の提案と検証査読有り

矢代茂樹, 安形俊秀, 吉村彰記

日本複合材料学会誌 44 巻 ( 1 ) 頁： 19-24 2018年1月

Progressive failure under high-velocity impact on composite laminates: Experiment and phenomenological mesomodeling 査読有り

R. Higuchi, T. Okabe, A. Yoshimura, T.E. Tay

Engineering Fracture Mechanics 178 巻頁： 346-361 2017年6月

極低温環境下における複合材料構造の接着破壊靭性査読有り

吉村彰記

材料 66 巻 ( 4 ) 頁： 282-287 2017年4月

Local out-of-plane deformation of CFRP ablator subjected to rapid heating 査読有り

J. Koyanagi, Y. Fukuda, S. Yoneyama, K. Hirai, A. Yoshimura, T. Aoki, T. Ogasawara

Advanced Composite Materials 26 巻 ( 1 ) 頁： 23-34 2017年1月

X線コンピュータ断層画像を用いた一方向炭素繊維強化プラスチックの3次元有限要素モデル構築と圧縮シミュレーション査読有り

飯塚啓輔, 上田政人, 高橋拓也, 吉村彰記, 中山真広

日本複合材料学会誌 43 巻 ( 6 ) 頁： 219-225 2017年

記述言語：日本語掲載種別：研究論文（学術雑誌）

<p>A unidirectional carbon fiber reinforced plastic (CFRP) was scanned by an X-ray computed tomography (CT) system. Based on the X-ray CT images, a three-dimensional model with random fiber waviness was developed. Each fiber location was identified in a sectional CT image. Subsequently, the relative displacement of fibers between adjacent sectional CT images was obtained with a digital image correlation method. This procedure was repeated to obtain fiber waviness along the axial direction. The constructed three-dimensional fiber model showed random waviness of each fiber in the unidirectional CFRP. Finite element analysis was performed using the three-dimensional model. Simulation results showed bending and twisting deformations coupled with axial contractions during axial compression, which developed due to fiber waviness. A reduction of the axial Young's modulus due to fiber random waviness was quantitatively evaluated.</p>

DOI： 10.6089/jscm.43.219

航空機用電動推進システム技術の飛行実証（FEATHER）

西沢啓, 岡井敬一, 小林宙, 飯島朋子, 山崎宏二, 奥山政広, 田頭剛, 平野義鎭, 吉村彰記, 進藤重美

日本航空宇宙学会誌 65 巻 ( 7 ) 頁： 8-12 2017年

AM技術のマイクロラティス構造への活用査読有り

牛島邦晴, 長倉祐太, 吉村彰記

スマートプロセス学会誌 6 巻 ( 3 ) 頁： 125-129 2017年

先進複合材料の研究開発におけるX線CTの適用とその可能性査読有り

吉村　彰記

非破壊検査 66 巻 ( 7 ) 頁： 289-294 2017年

Multiscale homogenization for nearly periodic structures 査読有り

A. Yoshimura, A. M. Waas

Composite Structures 153 巻頁： 345-355 2016年10月

Structural optimization for CFRP cryogenic tank based on energy release rate 査読有り

H. Fukui, A. Yoshimura, R. Matsuzaki

Composite Structures 152 巻頁： 883-890 2016年9月

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

ＣＦＲＰ一方向積層板および直交積層板における高速衝撃損傷査読有り

黄木景二, 田中孝明, 矢代茂樹, 吉村彰記

材料 60 巻 ( 5 ) 頁： 418-424 2011年

記述言語：日本語掲載種別：研究論文（学術雑誌）

This paper aims at characterizing the high-velocity impact damage behavior in carbon fiber reinforced plastic (CFRP) unidirectional (UD) and cross-ply (CP) laminates. First, the surface and internal damages of CFRP plates impacted at a velocity of 200 and 430m/s were observed by using optical microscopy together with radiography. Next, dynamic finite element analysis was performed to simulate the damage process. Cohesive elements were introduced to express the delamination and splitting cracks while the maximum stress fracture criteria were employed to express the intralaminar failure. Finally, the simulations were compared with the experiment results to verify the reasonability of the analysis. The damage process in both laminates was as follows : 1. A crater accompanied by splitting cracks is generated at the impact point on the front surface while splitting cracks due to bending are observed on the back surface. 2. Cone-shaped matrix cracking is observed in the UD laminate while few matrix cracking is generated in the CP laminate. 3. The shape of the delamination in the UD and CP laminates is a galaxy and a circle, respectively. Delamination size is larger in the CP laminate than in the UD laminate, which results in higher energy absorption capability in the CP laminate. Simulations are in qualitatively good agreement with the experiment results.

DOI： 10.2472/jsms.60.418

Damage growth analysis in particle-reinforced composite using cohesive element 査読有り

Yoshimura A.

Advanced Composite Materials 20 巻 ( 6 ) 頁： 569 - 583 2011年

平織CFRP積層板に加工されたネジ穴の引張り強さ

小笠原俊夫, 吉村彰記, 紙田徹

JAXA research and development memorandum 11 巻 ( 002 ) 頁： 1-11 2011年

Damage characterization in thin-ply composite laminates under out-of-plane transverse loadings 査読有り

Tomohiro Yokozeki, Akiko Kuroda, Akinori Yoshimura, Toshio Ogasawara, Takahira Aoki

COMPOSITE STRUCTURES 93 巻 ( 1 ) 頁： 49 - 57 2010年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCI LTD

Composite laminates with thin-ply layers are expected to exhibit superior damage resistance to the standard composite laminates. This study investigated the damage characteristics of carbon fiber/toughened epoxy thin-ply laminates subjected to transverse loadings. Quasi-isotropic laminates were prepared using both standard prepregs and thin-ply prepregs in order to examine the effect of ply thickness on the damage accumulation processes. Clear difference on damage accumulation process between standard laminates and thin-ply laminates was identified; fiber fractures were susceptible to formation in thin-ply laminates. Finally, the reason of the difference on damage process was investigated using finite element analyses, and it was clarified that the accumulated delamination position has a significant effect on the fiber fractures during the indentation. (C) 2010 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.compstruct.2010.06.016

Web of Science

Scopus

Coupled thermal-electrical analysis for carbon fiber/epoxy composites exposed to simulated lightning current 査読有り

Toshio Ogasawara, Yoshiyasu Hirano, Akinori Yoshimura

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING 41 巻 ( 8 ) 頁： 973 - 981 2010年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCI LTD

A coupled thermal-electrical analysis of carbon fiber reinforced polymer composites (CFRP) exposed to simulated lightning current was conducted in order to elucidate the damage behavior caused by a lightning strike with the numerical results being compared to experimental results. Based on the experimental results and a preliminary analysis, the specific mechanism of electrical conduction through the thickness direction of CFRP following thermal decomposition was revealed to be a key parameter for accurate numerical simulation. In particular, assuming the electrical conductivity in the thickness direction to be linear with respect to temperature in the range from the epoxy decomposition temperature to carbon sublimation temperature produced reasonable numerical results. The delamination area and damage depth were estimated from numerical results and thermal decomposition behavior of CFRP with the estimated damage area agreeing qualitatively with the experimental results. Numerical results suggest that Joule heat generation significantly influences lightning strike damage. (C) 2010 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.compositesa.2010.04.001

Web of Science

Scopus

Experimental characterization of high-speed impact damage behavior in a three-dimensionally woven SiC/SiC composite 査読有り

K. Ogi, T. Okabe, M. Takahashi, S. Yashiro, A. Yoshimura, T. Ogasawara

Composites Part A: Applied Science and Manufacturing 41 巻 ( 4 ) 頁： 489-498 2010年4月

A numerical simulation of time-dependent interface failure under shear and compressive loads in single-fiber composites 査読有り

Koyanagi J.

Applied Composite Materials 17 巻 ( 1 ) 頁： 31 - 41 2010年2月

Evaluation of Gas Permeability of CFRP Laminates under Cyclic Loadings 査読有り

YOKOZEKI Tomohiro, KURODA Akiko, YOSHIMURA Akinori, OGASAWARA Toshio, AOKI Takahira

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 8 巻 ( 27 ) 頁： Pc_5-Pc_9 2010年

模擬雷撃を受ける炭素繊維複合材料の熱-電気連成解析査読有り

小笠原俊夫, 平野義鎭, 吉村彰記

日本航空宇宙学会論文集 = Journal of the Japan Society for Aeronautical and Space Sciences 57 巻 ( 667 ) 頁： 336-343 2009年8月

記述言語：日本語掲載種別：研究論文（学術雑誌）

This paper presents coupled thermal-electrical analysis of transient temperature distribution in carbon fibre composites (CFRP) exposed to simulated lightning current to understand the damage behaviour due to lightening strike. Thermal and electrical properties of CFRP were evaluated for each direction of the unidirectional composites. The thermal decomposition behaviour was also estimated from thermo-gravimetric analysis results. Based on the experimental results and preliminary analysis results, the electrical and thermal boundary conditions were discussed in detail. The numerical results are directly compared with the experimental results, and the damage mechanisms of CFRP exposed to impulse current were considered. As a result, it was inferred that the delamination of CFRP was mainly caused by the decomposition of matrix resin, and the fibres were broken by the sublimation due to high Joule heat generation.

DOI： 10.2322/jjsass.57.336

結合力要素を用いた分散形複合材料の損傷進展解析査読有り

吉村彰記, 岡部朋永

日本複合材料学会誌 = Journal of the Japan Society for Composite Materials 35 巻 ( 3 ) 頁： 112-120 2009年5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）

The present paper proposes a simple numerical analytical method for crack extension simulation in the particle reinforced composite, and reveals the effect of crack extension on the macroscopic material properties of the particle reinforced composite. This numerical method is based on the homogenization method and Dugdale-type cohesive elements. In the present paper, we first present the formulation of the numerical model. We then verify the validity of the numerical model by comparing the simulated crack extension with the linear fracture mechanics. Finally we perform the crack extension simulation for the composite reinforced by spherical particle. We consider the inclusion crack and interfacial crack between inclusion and matrix. The analytical results reveal that the inclusion crack extends always unstably regardless of the size of initial crack, and the evolution of inclusion crack sharply decreases the apparent Young's modulus in the perpendicular direction to the crack surface and shear modulus in the out-of-plane direction of crack surface. The results also demonstrated that the interfacial crack always extends stably regardless of the size of initial crack, and the evolution of interfacial crack gradually degrades the stiffness in all direction.

DOI： 10.6089/jscm.35.112

Improvement of out-of-plane impact damage resistance of CFRP due to through-the-thickness stitching 査読有り

A. Yoshimura, T. Nakao, S. Yashiro, N. Takeda

Advanced Composite Materials 18 巻 ( 2 ) 頁： 121-134 2009年5月

Permeation-after-impact Properties of CFRP Laminates for Use on Propellant Tank 査読有り

YOKOZEKI Tomohiro, KURODA Akiko, YOSHIMURA Akinori, OGASAWARA Toshio, AOKI Takahira

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN 7 巻 ( 26 ) 頁： Pc_19-Pc_23 2009年

板厚方向の縫合によるCFRP積層板の面外衝撃損傷抑制効果査読有り

吉村彰記, 仲尾知晃, 武田展雄

日本複合材料学会誌 34 巻 ( 5 ) 頁： 182-188 2008年9月

円孔を有する縫合CFRP 積層板の損傷進展査読有り

吉村彰記, 矢代茂樹, 武田展雄

日本複合材料学会誌 34 巻 ( 1 ) 頁： 14-20 2008年1月

Improvement on out-of-plane impact resistance of CFRP laminates due to through-the-thickness stitching 査読有り

Composites Part A: Applied Science and Manufacturing 39 巻頁： 1370-1379 2008年

薄層化によるCFRP積層板の耐漏洩特性の向上査読有り

横関智弘, 高木智宏, 吉村彰記, 小笠原俊夫, 荻原慎二

日本航空宇宙学会論文集 56 巻 ( 657 ) 頁： 492-497 2008年

Characterization of tensile damage progress in stitched CFRP laminates 査読有り

A. Yoshimura, S. Yashiro, T. Okabe, N. Takeda

Advanced Composite Materials 16 巻 ( 3 ) 頁： 223-244 2007年

縫合CFRP 積層材の引張負荷下における損傷進展挙動査読有り

吉村彰記, 矢代茂樹, 岡部朋永, 武田展雄

日本複合材料学会誌 32 巻 ( 5 ) 頁： 198-207 2007年

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