Under-estimation of space environmental effects on materials in ground-based studies and new testing standards
Project/Area Number |
19K22017
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Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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Allocation Type | Multi-year Fund |
Review Section |
Medium-sized Section 24:Aerospace engineering, marine and maritime engineering, and related fields
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Research Institution | Kobe University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
横田 久美子 神戸大学, 工学研究科, 助手 (20252794)
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Project Period (FY) |
2019-06-28 – 2023-03-31
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Project Status |
Completed (Fiscal Year 2022)
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Budget Amount *help |
¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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Keywords | 宇宙環境 / 原子状酸素 / 超低地球軌道 / 材料劣化 / 国際標準 / 地球高層大気 / 窒素分子 / ポリイミド / 観測ロケット / ポリイミド劣化 / 地上試験 |
Outline of Research at the Start |
宇宙用材料・システムは宇宙環境の影響により特性変化・劣化を受けることが知られており、軌道上試験・地上模擬試験を用いた研究が行われてきたが、両者の結果には不整合が報告されている。さらに最近の研究ではこれまで考慮されてこなかった窒素分子の同時衝突が、材料劣化に大きな影響を与えることが報告されている。本研究課題ではレーザーデトネーション型原子状酸素環境模擬実験装置に新規原子状酸素センサー等を用いることにより、ポリイミドを基準材料としている現状の国際基準の不完全性を明確化し、科学的に根拠のある新基準の確立・提案を目指す。
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Outline of Final Research Achievements |
The objective of this research project is to clarify origins of incompleteness of the current international standards that use polyimide as a reference material, and to propose a new standard with scientific background. From a result of the simultaneous irradiation experiments conducted in this study, the polyimide degradation rate increased linearly with the ratio of high-energy molecules in the beam. This result clarifies the major origin of error in material degradation in very low Earth orbit (VLEO) using polyimide as a standard. The same phenomenon was also confirmed by the flight data of the world's first VLEO satellite, SLATS. This finding is an important insight into the material degradation phenomenon and its test method applicable to VLEO.
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Academic Significance and Societal Importance of the Research Achievements |
本研究の成果により、宇宙材料劣化地上試験と軌道上試験で生じる材料劣化試験の不整合問題の主たる原因がビーム中の高エネルギー分子衝突であることが特定され、地上試験における原子状酸素照射量の過大評価や今後の高精度化に向けた方向性が明確化された。さらに超低地球軌道(VLEO)衛星など材料劣化がクリティカルなミッションでの評価基準に関わる知見が得られ、国際基準への反映の必要性が認識された。
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Report
(5 results)
Research Products
(65 results)
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[Presentation] N2-acceleration effect on atomic oxygen-induced polyimide erosion in sub-LEO observed by SLATS/AOFS2022
Author(s)
Kumiko Yokota, Masahito Tagawa, Wataru Ide, Atsushi Fujita, Sasuga Horimoto, Santa Nishioka, Keisuke Ezaki, Yuta Tsuchiya, Aki Goto, Kazuki Yukumatsu, Eiji Miyazaki, Yugo Kimoto
Organizer
15th International Symposium on Materials in a Space Environment / 13th International Conference on Protection of Materials and Systems from Space Environment
Related Report
Int'l Joint Research
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[Presentation] Impact of neutral atmosphere environment on SLATS2022
Author(s)
Yugo Kimoto, Yuta Tsuchiya, Eiji Miyazaki, Aki Goto, Kazuki Yukumatsu, Shunsuke Imamura, Haruo Kawasaki, Masanori Sasaki, Kumiko Yokota, Masahito Tagawa, Wataru Ide, Atsushi Fujita, Shohei Urakawa, Sasuga Horimoto, Santa Nishioka
Organizer
15th International Symposium on Materials in a Space Environment / 13th International Conference on Protection of Materials and Systems from Space Environment
Related Report
Int'l Joint Research
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[Presentation] Scattering behavior of thermal molecular beams at microstructured surface for high compression intake system of air breathing ion engine2022
Author(s)
Keisuke Ezaki, Kosuke Shoda, Kazuki Itatani, Yuki Jotaki, Yuki Jotaki, Yusaku Ashida, Koki Sugimoto, Takashi Ozawa, Yusuke Yamashita, Kazutaka Nishiyama, Kumiko Yokota, Masahito Tagawa
Organizer
33rd International Symposium on Space Technology and Science
Related Report
Int'l Joint Research
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[Presentation] Development of atmospheric density probe aboard S-520-32 sounding rocket2022
Author(s)
Shoma Taira, Taishi Kato, Momoka Shimoi, Taiga Adachi, Towa Ushijima, Yusuke Yamashita, Takashi Ozawa, Takumi Abe, Yoshinori Nakayama, Kumiko Yokota, Masahito Tagawa
Organizer
33rd International Symposium on Space Technology and Science
Related Report
Int'l Joint Research
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[Presentation] VLEO-related research activities at Kobe University2021
Author(s)
Masahito Tagawa, Wataru Ide, Naoki Kano, Momoka Shimoi, Yuki Fukami, Kosuke Shoda, Taishi Kato, Kazuki Itatani, Atsushi Fujita, Sasuga Horimoto, Keisuke Ezaki, Shoma Taira, Yuki Jotaki, Kumiko Yokota
Organizer
1st International Symposium on VLEO Missions and Technologies
Related Report
Int'l Joint Research
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[Presentation] AO density variations during geomagnetic anomaly observed by SLATS2021
Author(s)
Atsushi Fujita, Kumiko Yokota, Masahito Tagawa, Wataru Ide, Sasuga Horimoto, Yugo Kimoto, Yuta Tsuchiya, Aki Goto, Kazuki Yukumatsu, Eiji Miyazaki, Yasunobu Miyoshi
Organizer
2nd Applied Space Environments Conference
Related Report
Int'l Joint Research
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[Presentation] Kapton erosion yields in various flight environments2019
Author(s)
Wataru Ide, Yusuke Fujimoto, Kim K. de Groh, Bruce A. Banks, Yuta Tsuchiya, Kazuki Yukumatsu, Aki Goto, Eiji Miyazaki Yugo Kimoto, Kumiko Yokota, Masahito Tagawa
Organizer
Joint Symposium of 32nd International Symposium on Space Technology and Science and 9th Nano-Satellites Symposium
Related Report
Int'l Joint Research
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