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| Hydrothermal Behaviors of T300/QY8911 Composites |
| Received:September 21, 2017 Revised:February 15, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.02.006 |
| KeyWord:carbon fiber bismaleitnide resin T300/QY8911 composites hydrothermal behavior |
| Author | Institution |
| ZHANG Feng-ling |
Shenyang Aircraft Corporation, Shenyang , China |
| SONG Ti-jie |
Shenyang Aircraft Corporation, Shenyang , China |
| MA Ke-ming |
Shenyang Aerospace University, Shenyang , China |
| WANG Jing |
Shenyang Aerospace University, Shenyang , China |
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| Abstract: |
| Objective To guarantee structural integrity and use safety of composites, and study hydrothermal behaviors, macroscopic mechanical properties and physical behaviors of resin matrix composites in hygrothermal environment. Methods Hydrothermal aging behaviors of T300/QY8911 composites at high temperature were studied through the accelerated aging method. Change rules of glass-transition temperature and mechanics performance of composites under different hydrothermal conditions were studied by dynamic mechanical thermal analysis (DMTA) and the mechanical property test respectively. Results The moisture absorption change of T300/QY8911 composites followed the Fick’s second law in the initial stage of hydrothermal treatment. The glass-transition temperature (θg) of T300/QY8911 composites decreased with the increase of moisture absorption. The Tg of T300/QY8911 composites corresponding to the tgδ peak decreased greatly under the saturated moisture absorption conditions. Tensile strength and compression strength of composites also decreased with the increase of hydrothermal treatment time. Conditions of hydrothermal treatment had obvious effect on the tensile fracture macro morphology of composites but have less effect on the compress fracture macro morphology of composites. Conclusion T300/QY8911 composites reach the saturated moisture absorption statue after 432 hours; the saturated moisture absorption is 1.34%; the diffusion coefficient of water molecule in composites is 7.38×10-5 mm2/s and the moisture absorption rate is 1.29×10-2 s-1. Under saturated moisture absorption conditions, the θg of T300/QY8911 composites corresponding to the tan δ peak decreases by 59.2 ℃ than dry state. The tensile strength and compression strength of T300/QY8911 composites decrease by 16.2% and 0.6% respectively than that of the nature state. |
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