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| Heat and Humid Aging Behaviour and Storage Life of Heat-Resistance Composite Materials |
| Received:May 21, 2024 Revised:June 01, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2024.07.007 |
| KeyWord:heat-resistance material glass fiber phenolic resin heat and humid aging mechanical properties microstructure chemical composition storage life |
| Author | Institution |
| GUO Wenying |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
| ZHONG Yingying |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
| ZHENG Yuxia |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
| LI Xuan |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
| ZHAO Qiyue |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
| WU Hao |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
| ZHANG Xin |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
| LI Tianmei |
Zhijian Laboratory, Rocket Force University of Engineering, Xi'an , China |
| LI Bin |
Beijing System Design Institute of Electro-Mechanic Engineering, Beijing , China |
| YAO Meiqi |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
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| Abstract: |
| The work aims to study the performance change law and evaluate the service life of heat-resistance composite materials for weapons under storage conditions. Accelerated aging test was conducted to study the change law of weight, thermal conductivity, mechanical properties, chemical composition, microstructures of glass fiber reinforced phenolic resin heat-resistance composite materials under 4 conditions of 90 ℃/90%RH, 80 ℃/90%RH, 70 ℃/90%RH and 80 ℃/80%RH, via IR, SEM, thermal conductivity and mechanical property test and Peck model was used to calculate the storage life of materials. At the beginning of aging, the weight of materials increased rapidly and reached a maximum value after moisture absorption tended to saturation. With the increase of aging time, the weight decreased gradually. Meanwhile, there was no change on thermal conductivity, but the mechanical properties of materials decreased under different heat and humid conditions. The properties decreased obviously with the increase of temperature. For example, for the aging time of 80 days under the condition of 90 ℃/ 90%RH, the strength of materials decreased to the 53.4% of the initial value. During the heat and humid aging, the characteristic peak of 960 cm‒1 in IR spectroscopy weakened gradually until completely vanished. The relative intensity of the characteristic peak at 1 098 cm‒1 gradually increased. During the aging, micro-cracks were observed between glass fiber and primary structure of materials and most glass fibers were pulled out from the primary structure of resin after tensile failure, with the smooth surface and less bonded resin. The aging of heat-resistance materials is caused by chemical aging of thermal degradation and oxidation, physical aging by surface unsticking, cracking of primary materials and micro-cracks under heat and humid conditions. The storage life of heat-resistance materials is 36.3 years under 20 ℃/60%RH, meeting the designed storage life of practical structure. |
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