Abstract
This study experimentally examined the effect of nanomaterial on the tensile behavior of carbon fiber-reinforced polymer (CFRP) composites. Multiwalled carbon nanotubes (MWCNT), graphene nanoplatelets (GnPs), and short multiwalled carbon nanotubes functionalized COOH (S-MWCNT-COOH) with 1% by weight were used as the primary test parameters. In the present test, S-MWCNT-COOH was more effective than the others in improving the maximum tensile strength, ultimate strain, and toughness of the CFRP composites. The use of S-MWCNT-COOH increased the maximum tensile strength, ultimate strain, and toughness of the CFRP composites by 20.7, 45.7, and 73.8%, respectively. In addition, tensile tests were carried out for CFRP composites with S-MWCNT-COOH after subjection to elevated temperatures ranging from 50 to 200°C. The test results showed that the tensile strength, ultimate strain, and toughness were significantly reduced with increasing temperature. At a temperature level of 100°C, the reduction of the maximum tensile strength, ultimate strain, and toughness was 36.5, 37.1, and 60.0%, respectively. However, for the specimens subjected to the elevated temperatures ranging from 100 to 200°C, the tensile behavioral properties were constantly maintained. Finally, various analytical models were applied to predict the tensile strength of the CFRP composites with S-MWCNT-COOH. By using the calibrated parameters, the tensile strengths predicted by the models showed good agreement with the experimental results.
Highlights
In recent years, fiber-reinforced polymer (FRP) composites have been widely used in the field of civil and architectural engineering as retrofitting or reinforcing material
The carbon fiber-reinforced polymer (CFRP) composites incorporating Multiwalled carbon nanotubes (MWCNT), graphene nanoplatelets (GnPs), and S-MWCNT-COOH displayed a similar failure mode. This means that the use of a particular nanomaterial did not affect the failure mode of the CFRP composites
To predict the tensile strength of S-MWCNTCOOH-CFRP specimens after exposure to high temperature, the existing models of Gibson et al [30], Bisby [47], Mahieux et al [48], and Wang et al [49] were used, by calibrating the parameters based on the test results
Summary
Fiber-reinforced polymer (FRP) composites have been widely used in the field of civil and architectural engineering as retrofitting or reinforcing material. The effect of incorporating nanomaterials on the tensile behavior of carbon fiber-reinforced polymer (CFRP) composites was experimentally investigated. Since the experimental data on the tensile properties of the FRP composites with nanomaterials exposed to elevated temperature are limited, this study examined the tensile properties of the CFRP composites with S-MWCNT-COOH after exposure to the elevated temperatures ranging from 50 to 200°C. This investigation is necessary to safely and reliably use the CFRP composites as building materials. Various analytical models were applied to predict the tensile strength of CFRP composites with S-MWCNT-COOH after exposure to elevated temperatures
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