期刊
COMPOSITE STRUCTURES
卷 120, 期 -, 页码 107-116出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2014.09.037
关键词
Smart cure cycle; Co-cure method; Hybrid composite; Thermal residual stress; Vanadium redox flow battery (VRFB); Co-cured flow frame and bipolar plate
资金
- EEWS Research Project of the office of the KAIST EEWS Initiative (EEWS: Energy, Environment, Water, and Sustainability) [EEWS-2014-N01140042]
- KI Projects
The vanadium redox flow battery (VRFB) is considered as one of the most promising energy storage system in the future. It is composed of two endplates and a stack which consists of flow frame (FF), electrode, bipolar plate (BP) and membrane. Because the electrolytes flowing in the stack are sulfuric-acid-based solutions, prevention of leakage is important. The unified structure of the FF and the BP manufactured by co-curing E-glass/epoxy and carbon/epoxy composites not only prevents leakage, but also simplifies assembling process. However, large thermal residual stress is induced due to the difference of coefficients of thermal expansion between E-glass/epoxy and carbon/epoxy composites. In this work, smart cure cycle was developed to reduce the thermal residual stress of the co-cured E-glass/carbon/epoxy structure for VRFB. The deformations of structure fabricated using smart cure cycle were investigated with respect to the degree of cure and post-cure process using the viscoelastic properties of composite materials during post-cure process. In addition, the thermal residual stress and actual bonding temperature were calculated. Using the experimental results of degree of cure and actual bonding temperature, a finite element analysis was performed to verify the stress of the co-cured FF BP structure as a function of the cure cycles. (C) 2014 Elsevier Ltd. All rights reserved.
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