2022 Fiscal Year Final Research Report
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 |
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| Review Section |
Medium-sized Section 24:Aerospace engineering, marine and maritime engineering, and related fields
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| Research Institution | Kobe University |
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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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| Keywords | 宇宙環境 / 原子状酸素 / 超低地球軌道 / 材料劣化 / 国際標準 |
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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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| Free Research Field |
宇宙環境工学
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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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