JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
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Other TitleMonitoring of mechanical behaviors and early stage damage on composite shear fastener joint
Author(jpn)佐藤 裕; 宇都宮 登雄; 高戸谷 健; 薄 一平
Author(eng)Sato, Yutaka; Utsunomiya, Takao; Takatoya, Takeshi; Susuki, Ippei
Author Affiliation(jpn)宇宙航空研究開発機構 総合技術研究本部 構造技術開発センター; 芝浦工業大学; 宇宙航空研究開発機構 総合技術研究本部 構造技術開発センター; 宇宙航空研究開発機構 総合技術研究本部 構造技術開発センター
Author Affiliation(eng)Japan Aerospace Exploration Agency Structure Technology Center, Institute of Aerospace Technology; Shibaura Institute of Technology; Japan Aerospace Exploration Agency Structure Technology Center, Institute of Aerospace Technology; Japan Aerospace Exploration Agency Structure Technology Center, Institute of Aerospace Technology
Issue Date2008-02-29
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication date2008-02-29
AbstractIn a structural material of the aircraft, the proportion of composite materials keeps rising more and more because of their excellent properties on specific strength and rigidity. The part where a metallic material is connected to the composite material increases by such circumstances, and how a structural integrity in such a place is secured becomes an important problem. From the point of view, a principle of a method to monitor the mechanical and damage behaviors using axial strain in fastener bolt was proposed. In this paper, we actually made the fastener with an optical fiber sensor embedded in the shank of a titanium bolt, and applied it to the composite/titanium mechanical shear joint specimens to prove the function of it through the tensile tests. The results are summarized as follows; (1) proposed monitoring method is well available to monitor the load transfer mode around the fastener hole, (2) we can detect the damage by the change of inclination in the relationship between load and axial strain measured by the fastener bolt, and (3) it was shown that the early stage of damage of composites around the fastener hole can be detected by using the fastener bolt.
DescriptionJAXA Research and Development Report
Keywordscomposite material; aircraft construction material; weight reduction; aircraft design; tensile strength; bolted joint; optical fiber; fracture strength; strain gage; early stage damage; 複合材料; 航空機構造材料; 軽量化; 航空機設計; 引張強度; ボルト継ぎ手; 光ファイバ; 破壊強度; ひずみ計; 初期損傷
Document TypeTechnical Report
JAXA Category研究開発報告
Report NoJAXA-RR-07-010

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