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| Interlaminar Shear Properties and Lifetime Estimation of Fiber-reinforced Epoxy Composites under Hygrothermal Conditions |
| Received:April 07, 2025 Revised:May 16, 2025 |
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| DOI：10.7643/issn.1672-9242.2025.05.009 |
| KeyWord:composite hygrothermal ageing carbon fiber glass fiber epoxy resin interlaminar shear properties life prediction |
| Author | Institution |
| TIAN Xiaoxiao |
Beijing Institute of Mechanical Equipment, Beijing , China |
| GUO Qingyi |
Beijing Institute of Mechanical Equipment, Beijing , China |
| PENG Gaorong |
The 5th Military Representative Office of Rocket in Beijing Region, Beijing , China |
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| Abstract: |
| The work aims to investigate the effect of hygrothermal conditions on interlaminar shear properties and predict the storage life of composite materials. Accelerated hygrothermal ageing experiments were conducted on T700 carbon fiber/epoxy resin composites and SC-1200 glass fiber/epoxy resin composites under four experimental conditions. The infrared spectra, glass transition temperatures, and interlaminar shear properties of the specimens before and after hygrothermal ageing were tested. Degradation rates of material properties under different experimental conditions were calculated with the generalized Eyring model, and the relationship between degradation rate and ambient temperature and relative humidity was established. After hygrothermal ageing, the glass transition temperature of the composites decreased significantly, and their mechanical properties also showed a marked decrease. The variation in the degradation rate of interlaminar shear properties was analyzed, and the model for the degradation rate controlled by the temperature/relative humidity for T700 carbon fiber/epoxy resin composites and SC-1200 glass fiber/epoxy resin composites was established. The degradation rate of the composite mechanical properties under specific storage conditions was estimated. During accelerated hygrothermal ageing, the properties of carbon fiber/epoxy resin and glass fiber/epoxy resin unidirectional board degrade significantly. Based on the failure criterion defined as a reduction to 70% in interlaminar shear properties from initial mechanical properties, it can be calculated that under 20 ℃/ 80%RH condition, T700 carbon fiber/epoxy resin composite can be stored for 6 119.06 days (16.76 years) and SC-1200 glass fiber/epoxy resin composite can be stored for 3 793.01 days (10.39 years). |
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