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Polymers 2017, 9(11), 603; https://doi.org/10.3390/polym9110603

Comparative Study of the Durability Behaviors of Epoxy- and Polyurethane-Based CFRP Plates Subjected to the Combined Effects of Sustained Bending and Water/Seawater Immersion

1,2,3
,
1,2,3,* and 1,2,3
1
Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, 73 Huanghe Road, Nangang District, Harbin 150090, China
2
Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, China
3
School of Civil Engineering, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, China
*
Author to whom correspondence should be addressed.
Received: 1 October 2017 / Revised: 9 November 2017 / Accepted: 10 November 2017 / Published: 12 November 2017

Abstract

In many applications, carbon fiber reinforced polymer (CFRP) composite materials suffer from the combined effects of sustained bending and immersion. In the present study, pultruded epoxy- and polyurethane (PU)-based CFRP plates were studied for their long-term performances, subjected to the combined effects of water/seawater immersion and sustained bending (0%, 30%, and 58% of the ultimate strain). The water uptake and the evolution of the mechanical properties were investigated. In addition, the service lives of the CFRPs were predicted using the Arrhenius method. Generally, the sustained bending led to a decrease in the water uptake, and reduced the mechanical properties. A diffusion model, dividing the cross-section of CFRPs into the “less resin area” and “rich resin area”, was proposed to elucidate the variation of water uptake and mechanical properties. Compared to epoxy-based CFRPs, although PU-based CFRPs possessed a significantly higher water uptake, they exhibited better long-term performances in terms of mechanical properties. View Full-Text
Keywords: epoxy resin; polyurethane; CFRP plates; water; seawater; bending strain; water uptake; in-plane shear strength; tensile properties epoxy resin; polyurethane; CFRP plates; water; seawater; bending strain; water uptake; in-plane shear strength; tensile properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Hong, B.; Xian, G.; Li, H. Comparative Study of the Durability Behaviors of Epoxy- and Polyurethane-Based CFRP Plates Subjected to the Combined Effects of Sustained Bending and Water/Seawater Immersion. Polymers 2017, 9, 603.

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