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| Long-term Standby Storage Life Evaluation Method for a Novel Thermal Protection Material Based on Maintainability Requirements |
| Received:March 27, 2025 Revised:April 16, 2025 |
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| DOI：10.7643/issn.1672-9242.2025.05.008 |
| KeyWord:thermal protection material long-term standby storage maintainability requirements creep test accelerated aging test life evaluation method |
| Author | Institution |
| SUN Lan |
Beijing Institute of Mechanic and Electric Engineering, Beijing , China |
| SHI Chenxi |
Beijing Institute of Mechanic and Electric Engineering, Beijing , China |
| REN Jiean |
Beijing Institute of Mechanic and Electric Engineering, Beijing , China |
| SUN Jianliang |
Beijing Institute of Mechanic and Electric Engineering, Beijing , China |
| CAO Jie |
Beijing Institute of Mechanic and Electric Engineering, Beijing , China |
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| Abstract: |
| In order to meet the maintainability requirements of the novel thermal protection material for the spacecraft during long-term standby storage, the work aims to analyze the loading characteristics of the material, design the relevant experiments, and evaluate whether the material can meet the maintainability requirements during the storage. Firstly, the natural and mechanical environmental profiles of the novel thermal protection material during long-term standby storage were analyzed. Secondly, the loading characteristics of the material were quantitatively analyzed to develop the creep test, repeat load-unload test and temperature-humidity accelerated aging test. The deformation of the novel thermal protection material, which was caused by the superposition of creep deformation and transportation overload deformation, served as the criteria for determining whether the thermal protection layer met its maintainability requirements. The creep test was designed to obtain creep strain. The repeat load-unload test showed that the maximum strain was related to the maximum load, while the intermediate loading and unloading processes could be neglected. Through the temperature-humidity accelerated aging test, the compressive modulus expression and its aging law were obtained, allowing the determination of the compressive modulus under storage conditions and the calculation of transportation overload deformation. Aiming at the maintainability requirement that the concave deformation of the bearing part of the novel thermal protection layer of the spacecraft is not more than 1 mm after 20 years of storage. The test and calculation results show that the sum of creep deformation and transportation overload deformation is 0.72 mm, which meets the storage life requirements. |
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