JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
titleチタン合金及びCFRPに種々の表面処理を施した場合の濡れ性と表面形状評価及び接着接合継手強度
Other TitleWettability, surface geometry and adhesively-bonded joint strength of various surface treatments on titanium alloys or CFRP
DOIinfo:doi/10.20637/JAXA-RR-16-014/0001
Author(jpn)安岡, 哲夫; 竹田, 智; 星, 光; 杉本, 直; 岩堀, 豊
Author(eng)Yasuoka, Tetsuo; Takeda, Tomo; Hoshi, Hikaru; Sugimoto, Sunao; Iwahori, Yutaka
Author Affiliation(jpn)宇宙航空研究開発機構航空技術部門構造・複合材技術研究ユニット(JAXA); 宇宙航空研究開発機構航空技術部門構造・複合材技術研究ユニット(JAXA); 宇宙航空研究開発機構航空技術部門構造・複合材技術研究ユニット(JAXA); 宇宙航空研究開発機構航空技術部門構造・複合材技術研究ユニット(JAXA); 宇宙航空研究開発機構航空技術部門構造・複合材技術研究ユニット(JAXA)
Author Affiliation(eng)Structures and Advanced Composite Research Unit, Aeronautical Technology Directorate, Japan Aerospace Exploration Agency (JAXA); Structures and Advanced Composite Research Unit, Aeronautical Technology Directorate, Japan Aerospace Exploration Agency (JAXA); Structures and Advanced Composite Research Unit, Aeronautical Technology Directorate, Japan Aerospace Exploration Agency (JAXA); Structures and Advanced Composite Research Unit, Aeronautical Technology Directorate, Japan Aerospace Exploration Agency (JAXA); Structures and Advanced Composite Research Unit, Aeronautical Technology Directorate, Japan Aerospace Exploration Agency (JAXA)
Issue Date2017-02-15
Publisher宇宙航空研究開発機構(JAXA)
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構研究開発報告
JAXA Research and Development Report
VolumeJAXA-RR-16-014
Start page1
End page24
Publication date2017-02-15
Languagejpn
eng
Abstract航空宇宙のCFRP一次構造物は基本的にメカニカルファスニングによる継手が用いられている.これを接着接合継手に置き換えることで,さらなる軽量化を達成することができる.特にMetal-CFRP継手について言えば,一体成形ができないため,接着接合継手が不可避である.しかしながら,現状,型式認証基準をクリアするには接着接合はハイコストであり,メカニカルファスニングに比べて不利である.接着接合のコスト削減のアプローチの1つは,新しい表面処理法を導入することである.本研究では,チタン合金とCFRPについて,新しい技術を含む様々な表面処理法を適用し,濡れ性及び表面形状を評価するとともに,シングルラップによる接着接合継手を作製し,継手強度の測定を行った.チタン合金については,表面処理としてイトロ処理とレザリッジを用いた接着継手の強度が,従来の表面処理法による水準とFEAにより推定した接着剤破壊水準を超える強さを示した.濡れ性及び表面形状評価の結果から,イトロ処理は,二次結合とメカニカルインターロッキング以外の接着メカニズム,例えば一次結合によって高強度が発現したと推察された.一方レザリッジは,表面形状として深さ100μm 以上の溝を有しており,その溝でメカニカルインターロッキングが発現し,高強度を示したと推察された.これらの表面処理は簡易であり,表面処理コスト削減と接着品質の安定化が見込め,新しい表面処理技術として実機適用が期待できる.CFRPについては,従来の表面処理法であるサンドペーパーが最も高強度であった.しかし次点の大気圧プラズマの方が処理がより簡易であり,次世代の表面処理技術として今後の可能性は大きい.
Mechanical-fastening joints are basically implemented for CFRP’s primary structures of aircrafts. If adhesively-bonded joints take the place of them, further weight-savings could be achieved. In particular, the adhesive bonding is essential to the metal-CFRP joints because they cannot assemble by integral moulding. However, the adhesive bonding currently takes a high cost in order to meet certification requirements and that is a disadvantageous point compared with the mechanical-fastening. One of approaches to reduce the cost of the adhesive bonding is an introduction of new surface-treating technologies. In this study, various surface treatments on titanium alloys or CFRP including latest technologies were picked up, and then wettability and surface geometry for each treatment were inspected, after that strength of adhesively-bonded single-lapped joints were measured. As for titanium alloys, the results showed that two surface treatments, Itro treatment and Laseridge, brought out acceptable strength. The strengths of those joints exceeded the level of conventional implemented surface treatment or the level of cohesive failure in adhesives which was estimated from finite element analysis. The high strength of Itro treatment may be caused by some kind of mechanism except for secondary bonding or mechanical interlocking (e.g. primary bonding) as a result of inspection of wettability and surface geometry. The other treatment, Laseridge, generated deep grooves on the surfaces whose depth was over 100μm. The deep grooves may cause mechanical interlocking as a mechanism of adhesive bonding. These treatments would attain cost reduction and quality stabilization of adhesive bonding because the procedures are quite simple compared with the traditional way. In other words, they are practical treatment of promise. As for the strength of adhesively-bonded CFRP joints, sandpaper abrasion showed the highest strength and atmospheric plasma treatment was second. However, a process of the atmospheric plasma treatment is more simple than the sandpaper abrasion, therefore it has a potentiality as the next-generation technology.
Description形態: カラー図版あり
Physical characteristics: Original contains color illustrations
KeywordsSurface treatment; adhesive bonding; titanium alloy; CFRP; aircraft structure; single-lap joint; tensile shear strength; contact angle; surface free energy; roughness
Document TypeTechnical Report
JAXA Category研究開発報告
NASA Subject CategoryComposite Materials
ISSN1349-1113
NCIDAA1192675X
SHI-NOAA1630037000
Report NoJAXA-RR-16-014
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/591862


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