JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
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Other TitleSize effect on the transverse tensile strength of unidirectional carbon fiber / epoxy composites
Author(jpn)小笠原, 俊夫; 原, 栄一
Author(eng)Ogasawara, Toshio; Hara, Eiichi
Author Affiliation(jpn)宇宙航空研究開発機構研究開発本部材料グループ; 航空宇宙技術振興財団
Author Affiliation(eng)Advanced Materials Group, Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA); Foundation for Promotion of Japanese Aerospace Technology
Issue Date2009-02-06
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication titleJAXA research and development memorandum
Publication date2009-02-06
AbstractSize effect of the transverse tensile strength of unidirectional carbon fiber / epoxy composites (CFRP (Carbon Fiber Reinforced Plastics)) was examined experimentally. Three point bending tests and tensile tests were carried out for two kinds of carbon/epoxy composites, and the Weibull statistics based on weakest link theory was applied for evaluating the size effect. The size effect was calculated as a function of the effective volume, surface area, or edge length using the Weibull parameters obtained from three point bending tests, and the numerical results were compared with the experimental results. As a result, it was found that competing risk model considering both effective volume and surface area showed good agreement with the experimental results. It was demonstrated that the transverse tensile strengths of unidirectional carbon/epoxy composites are basically equivalent to the bending strengths.
一方向Carbon/Epoxy複合材料(CFRP (Carbon Fiber Reinforced Plastics))を対象として、90度方向引張り強度の寸法効果について実験的な検討を行った。2種類の一方向CFRPに対して3点曲げ試験および引張り試験を行い、寸法効果の評価には、最弱リンクモデルに基づくワイブル分布を適用した。曲げ試験によって得られたワイブル係数を用いて有効体積、有効表面積および有効エッジに対する寸法効果を計算し、実験結果との比較を行った。その結果、有効体積と有効表面積の両方を考慮した競合リスクモデルが実験結果と良い対応を示すことがわかった。これらの検討により一方向CFRPの90度引張り強度における曲げ強度と引張り強度の等価性が実験的に示された。
Description形態: カラー図版あり
KeywordsTransverse tensile strength, Size effect, Weibull statistics, Unidirectional composite laminate
Document TypeTechnical Report
JAXA Category研究開発資料
Report NoJAXA-RM-08-007

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