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.
Highlights
In recent years, carbon fiber reinforced polymer (CFRP) composites with excellent mechanical properties have been widely used in rehabilitation, repair and reinforcement of various civil structures [1,2,3,4,5,6]
According to the above-mentioned problems, the present study investigated and compared the evolution laws in water uptake, in-plane shear strength (IPSS), and the tensile properties of epoxy- and PU-based CFRPs, subjected to water/seawater immersion at 20 ◦ C or 60 ◦ C together with sustained bending strain levels (0%, 30%, and 58% of the ultimate extensional strain)
Uptakeof epoxy- and PU-based CFRPs immersed in water/seawater at 20 and 60 ◦ C for
Summary
Carbon fiber reinforced polymer (CFRP) composites with excellent mechanical properties have been widely used in rehabilitation, repair and reinforcement of various civil structures [1,2,3,4,5,6]. During their service lives, they may suffer from certain harsh environments, such as moisture, water, and seawater even at elevated temperatures [7,8,9,10,11]. A comparative study on the combined effects of water/seawater immersion and sustained bending on epoxy- and PU-based CFRPs was conducted in terms of water uptake, fiber-resin interfacial bond strength, and tensile properties
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