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Polymers 2017, 9(4), 151; doi:10.3390/polym9040151

Mechanical Behavior of Hybrid Glass/Steel Fiber Reinforced Epoxy Composites

1
Civil and Environmental Engineering Department, University of Connecticut, 261 Glenbrook Road, Unit 3037, Storrs, CT 06269-3037, USA
2
Chemical and Biomolecular Engineering, University of Connecticut, 191 Auditorium Road, Unit 3222, Storrs, CT 06269-3222, USA
3
Polymer Program, Institute of Materials Science, University of Connecticut, 97 North Eagleville Road, Unit 3136, Storrs, CT 06269-3136, USA
4
Biomedical Engineering, University of Connecticut, 260 Glenbrook Road, Unit 3247, Storrs, CT 06269-3247, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Mohamed Khayet
Received: 21 February 2017 / Revised: 17 April 2017 / Accepted: 19 April 2017 / Published: 23 April 2017
View Full-Text   |   Download PDF [5990 KB, uploaded 23 April 2017]   |  

Abstract

While conventional fiber-reinforced polymer composites offer high strength and stiffness, they lack ductility and the ability to absorb energy before failure. This work investigates hybrid fiber composites for structural applications comprised of polymer, steel fiber, and glass fibers to address this shortcoming. Varying volume fractions of thin, ductile steel fibers were introduced into glass fiber reinforced epoxy composites. Non-hybrid and hybrid composite specimens were prepared and subjected to monolithic and half-cyclic tensile testing to obtain stress-strain relationships, hysteresis behavior, and insight into failure mechanisms. Open-hole testing was used to assess the vulnerability of the composites to stress concentration. Incorporating steel fibers into glass/epoxy composites offered a significant improvement in energy absorption prior to failure and material re-centering capabilities. It was found that a lower percentage of steel fibers (8.2%) in the hybrid composite outperformed those with higher percentages (15.7% and 22.8%) in terms of energy absorption and re-centering, as the glass reinforcement distributed the plasticity over a larger area. A bilinear hysteresis model was developed to predict cyclic behavior of the hybrid composite. View Full-Text
Keywords: composite; hybrid; fiber reinforced polymer; mechanical properties; plastic deformation; energy absorption composite; hybrid; fiber reinforced polymer; mechanical properties; plastic deformation; energy absorption
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MDPI and ACS Style

McBride, A.K.; Turek, S.L.; Zaghi, A.E.; Burke, K.A. Mechanical Behavior of Hybrid Glass/Steel Fiber Reinforced Epoxy Composites. Polymers 2017, 9, 151.

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