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| Accelerated Test Design and Evaluation Method of Composites Considering Complex Environmental Effects |
| Received:May 15, 2024 Revised:June 08, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2024.07.005 |
| KeyWord:composites complex environmental effects test design accelerated test hygrothermal stress degradation |
| Author | Institution |
| ZHAO Pengfei |
Aerospace Science & Industry Corp Defense Technology R&T Center, Beijing , China |
| LI Hao |
Aerospace Science & Industry Corp Defense Technology R&T Center, Beijing , China |
| LIU Yan |
Beijing Institute of Electronics Systems Engineering, Beijing , China |
| WANG Zengkai |
Beijing Institute of Electronics Systems Engineering, Beijing , China |
| ZHANG Shengpeng |
Aerospace Science & Industry Corp Defense Technology R&T Center, Beijing , China |
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| Abstract: |
| The work aims to guide the development of environmental adaptability mapping and evaluation tests of composites in complex hygrothermal environments, and to analyze and evaluate the activation energy parameters of composites under complex comprehensive stresses. In this paper, the complex environment profile and the effects of environmental factors during the whole life cycle of the equipment were analyzed, and the types and magnitude of sensitive stresses in each working stage of composites were determined. A dynamic model of composites under complex environmental conditions was constructed and corresponding parameter estimation methods were proposed. Accelerated tests of composites were carried out, and degradation modeling and evaluation of composite properties were carried out based on measured data. By analyzing the environmental effects of various environmental factors in the whole life cycle of the composites, the temperature, hygrothermal stress, solar irradiation, cycling temperature, vibration and shock in each working stage were regarded as the sensitive stresses. According to the actual environmental data, three sets of comprehensive environmental acceleration tests under different hygrothermal conditions (80 ℃/75%RH, 80 ℃/85%RH, 80 ℃/95%RH) were designed and carried out, and the test data of tensile strength, tensile shear strength, radial bending strength and zonal bending strength of composite were collected. The test data showed that tensile shear strength (the maximum relative degradation rate was 0.177 3/cycle), radial bending strength (the maximum relative degradation rate was 0.129 2/cycle) and zonal bending strength (the maximum relative degradation rate was 0.261 0/cycle) could be used for product degradation modeling and evaluation. The relationship between degradation modeling rate and hygrothermal stress and thermal stress was further determined by parameter estimation. The basis for improvement was provided according to the current test. The comprehensive accelerated test can simulate and accelerate the complex environment experienced by the equipment composite products, and the test can be implemented. The improved generalized Eyring model can cover the acceleration effect of temperature stress and humidity thermal stress, and give comprehensive consideration to the interaction of multiple stresses. Parameters such as activation energy can be quantified by a small number of combination tests. The model indicates that the current test scheme based on reference activation energy (Ea=0.7 eV) can be further modified and optimized by the comprehensive test data of different temperature stresses. The proposed test and analysis method can be applied to most resin matrix composite products, and can be extended to electronic products, mechanical and electrical products and other test objects as required. |
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