An investigation on post-fire behavior of hybrid nanocomposites under bending loads |
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| Authors: | Antonio F Ávila Maria Irene Yoshida Maria Gabriela R Carvalho Eder C Dias José de Ávila |
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| Affiliation: | 1. Department of Mechanical Engineering and Mechanical Engineering Graduate Studies Program, Universidade Federal de Minas Gerais, 6627 Antonio Carlos Avenue, Belo Horizonte MG31270-901, Brazil;2. Department of Chemistry, Universidade Federal de Minas Gerais, 6627 Antonio Carlos Avenue, Belo Horizonte MG31270-901, Brazil;3. Mechanical Engineering Graduate Studies Program, Universidade Federal de Minas Gerais, 6627 Antonio Carlos Avenue, Belo Horizonte MG31270-901, Brazil;1. Chongqing Key Laboratory of Heterogeneous Material Mechanics, College of Aerospace Engineering, Chongqing University, Chongqing 400030, China;2. State Key Lab for Strength and Vibration of Mechanical Structures, Xi''an Jiaotong University, Xi''an 710049, China;3. Chongqing Nankai Secondary School, Chongqing 400030, China;4. College of Physics and Institute for Structure and Function, Chongqing University, Chongqing 400030, China;5. LTCS and College of Engineering, Peking University, Beijing 100871, China;1. Department of Civil Engineering, Zhejiang University, Hangzhou 310058, PR China;2. Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, PR China;3. Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, PR China;1. School of Aerospace, Mechanical & Manufacturing Engineering, RMIT University, GPO Box 2476, Melbourne, Australia;2. Institute for Materials Research and Innovation, University of Bolton, Bolton BL3 5AB, UK |
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| Abstract: | This work focuses on residual bending properties of hybrid nanocomposites after intense heat conditions. Carbon fiber/epoxy-nanoclay and carbon fiber/epoxy-graphene nanosheets were manufactured. The nanoparticles employed were Cloisite 30B nanoclay and surface modified graphene nanosheets. The epoxy system was RemLam M/HY956. For short beam samples exposed to 800 KW/m2 heat flux, for a various period of time up to 120 s, the addition of nanoparticles (nanoclay and graphene nanosheets) increased the unburned thickness from 0.16 mm (original) to 2.63 mm and 2.74 mm, respectively. When the two-dimensional (plates) samples were tested, the improvement on heat performance was reduced. The unburned thickness improved close to 10% with the presence of nanoclay. The addition of graphene nanosheets leads to a decrease in unburned thickness of 12.8%. This result can be due to the good thermal protection properties of the graphene nanosheets. Using SEM analysis, it was observed that when the hybrid nanocomposites were subjected to a large heat flux, nanoparticles remained trapped inside the char layers. Finally, the proposed model seems to overestimate the residual bending response by 8%. |
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