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Article

In Situ Strain and Damage Monitoring of GFRP Laminates Incorporating Carbon Nanofibers under Tension

1
State Key Laboratory of Coastal and Offshore Engineering, School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
2
Department of Civil, Construction and Environmental Engineering, Marquette University, Milwaukee, WI 53201, USA
3
Laboratory of Solid Structures, University of Luxembourg, L1359 Luxembourg, Luxembourg
*
Author to whom correspondence should be addressed.
Polymers 2018, 10(7), 777; https://doi.org/10.3390/polym10070777
Received: 5 June 2018 / Revised: 4 July 2018 / Accepted: 10 July 2018 / Published: 16 July 2018
(This article belongs to the Special Issue Multi-functional Polymer Composites and Structures)
In this study, conductive carbon nanofibers (CNFs) were dispersed into epoxy resin and then infused into glass fiber fabric to fabricate CNF/glass fiber-reinforced polymer (GFRP) laminates. The electrical resistance and strain of CNF/GFRP laminates were measured simultaneously during tensile loadings to investigate the in situ strain and damage monitoring capability of CNF/GFRP laminates. The damage evolution and conduction mechanisms of the laminates were also presented. The results indicated that the percolation threshold of CNFs content for CNF/GFRP laminates was 0.86 wt % based on a typical power law. The resistance response during monotonic tensile loading could be classified into three stages corresponding to different damage mechanisms, which demonstrated a good ability of in situ damage monitoring of the CNF/GFRP laminates. In addition, the capacity of in situ strain monitoring of the laminates during small strain stages was also confirmed according to the synchronous and reversible resistance responses to strain under constant cyclic tensile loading. Moreover, the analysis of the resistance responses during incremental amplitude cyclic tensile loading with the maximum strain of 1.5% suggested that in situ strain and damage monitoring of the CNF/GFRP laminates were feasible and stable. View Full-Text
Keywords: glass fiber-reinforced polymer (GFRP); carbon nanofibers (CNFs); damage; strain; monitoring glass fiber-reinforced polymer (GFRP); carbon nanofibers (CNFs); damage; strain; monitoring
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MDPI and ACS Style

Wang, Y.; Wang, Y.; Han, B.; Wan, B.; Cai, G.; Chang, R. In Situ Strain and Damage Monitoring of GFRP Laminates Incorporating Carbon Nanofibers under Tension. Polymers 2018, 10, 777. https://doi.org/10.3390/polym10070777

AMA Style

Wang Y, Wang Y, Han B, Wan B, Cai G, Chang R. In Situ Strain and Damage Monitoring of GFRP Laminates Incorporating Carbon Nanofibers under Tension. Polymers. 2018; 10(7):777. https://doi.org/10.3390/polym10070777

Chicago/Turabian Style

Wang, Yanlei, Yongshuai Wang, Baoguo Han, Baolin Wan, Gaochuang Cai, and Ruijuan Chang. 2018. "In Situ Strain and Damage Monitoring of GFRP Laminates Incorporating Carbon Nanofibers under Tension" Polymers 10, no. 7: 777. https://doi.org/10.3390/polym10070777

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