Survival of actively cooled microvascular polymer matrix composites under sustained thermomechanical loading |
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| Affiliation: | 1. Department of Aerospace Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;2. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;3. Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;1. Department of Mechanical and Aerospace Engineering, Sapienza University of Rome, via Eudossiana 18, 00184 Rome, Italy;2. Department of Industrial and Information Engineering, Second University of Naples, via Roma 29, 81031 Aversa (CE), Italy;3. CNR-INSEAN, National Research Council of Italy, Maritime Research Center via di Vallerano 139, 00128 Rome, Italy;1. Grupo de Elasticidad y Resistencia de Materiales, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain;2. Dipartimento di Ingegneria Strutturale, Edile e Geotecnica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;1. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, United States;2. Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109, United States;1. Textile Physics Division, Bangladesh Jute Research Institute, Dhaka, Bangladesh;2. Department of Materials & Metallurgical Engineering, Bangladesh University of Engineering & Technology, Dhaka, Bangladesh |
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| Abstract: | Exposure to high heat can cause polymer matrix composites (PMC) to fail under mechanical loads easily sustained at room temperature. However, heat is removed and temperature reduced in PMCs by active cooling through an internal vascular network. Here we compare structural survival of PMCs under thermomechanical loading with and without active cooling. Microchannels are incorporated into autoclave-cured carbon fiber/epoxy composites using sacrificial fibers. Time-to-failure, material temperature, and heat removal rates are measured during simultaneous heating on one face (5–75 kW/m2) and compressive loading (100–250 MPa). The effects of applied compressive load, heat flux, channel spacing, coolant flow rate, and channel distance from the heated surface are examined. Actively cooled composites containing 0.33% channel volume fraction survive without structural failure for longer than 30 min under 200 MPa compressive loading and 60 kW/m2 heat flux. In dramatic comparison, non-cooled composites fail in less than a minute under the same loading conditions. |
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| Keywords: | B Thermomechanical B High-temperature properties D Thermal analysis Vascular cooling |
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