期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 78, 期 -, 页码 412-423出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2015.07.012
关键词
Thermomechanical; High-temperature properties; Vascular cooling
资金
- Air Force Office of Scientific Research as part of a Multidisciplinary University Research Initiative [FA9550-09-1-0686]
- National Science Foundation [DGE 11-44245]
An actively cooled vascular polymer matrix composite containing 3.0% channel volume fraction retains greater than 90% flexural stiffness when exposed continuously to 325 degrees C environmental temperature. Non-cooled controls suffered complete structural failure through thermal degradation under the same conditions. Glass-epoxy composites (T-g = 152 degrees C) manufactured by vacuum assisted resin transfer molding contain microchannel networks of two different architectures optimized for thermal and mechanical performance. Microchannels are fabricated by vaporization of poly(lactide) fibers treated with tin(II) oxalate catalyst that are incorporated into the fiber preform prior to resin infiltration. Flexural modulus, material temperature, and heat removal rates are measured during four-point bending testing as a function of environmental temperature and coolant flow rate. Simulations validate experimental measurements and provide insight into the thermal behavior. Vascular specimens with only 1.5% channel volume fraction centered at the neutral bending axis also retained over 80% flexural stiffness at 325 degrees C environmental temperature. (C) 2015 Elsevier Ltd. All rights reserved.
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