Next Article in Journal
Multiple Leader Candidate and Competitive Position Allocation for Robust Formation against Member Robot Faults
Previous Article in Journal
Accuracy of a Custom Physical Activity and Knee Angle Measurement Sensor System for Patients with Neuromuscular Disorders and Gait Abnormalities
Previous Article in Special Issue
The Application of a Piezo-Resistive Cardiorespiratory Sensor System in an Automobile Safety Belt
Article Menu

Export Article

Open AccessArticle
Sensors 2015, 15(5), 10753-10770; doi:10.3390/s150510753

Carbon Fiber Epoxy Composites for Both Strengthening and Health Monitoring of Structures

1
FibEnTech—Research Unit of Fiber Materials and Environmental Technologies, Universidade da Beira Interior, 6201-001 Covilhã, Portugal
2
Department of Structural Engineering, Silesian University of Technology, ul. Akademicka 5, 44-100 Gliwice, Poland
3
Departamento de Informática, Instituto de Telecomunicações, Universidade da Beira Interior, 6201-001 Covilhã, Portugal
4
Departamento de Engenharia Eletromecânica, Instituto de Telecomunicações, Universidade da Beira Interior, 6201-001 Covilhã, Portugal
5
MADE, Centre of Materials and Building Technologies, Departamento de Engenharia Civil e Arquitetura, Universidade da Beira Interior, 6201-001 Covilhã, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Alberto Vallan
Received: 16 October 2014 / Revised: 26 April 2015 / Accepted: 27 April 2015 / Published: 6 May 2015
View Full-Text   |   Download PDF [2544 KB, uploaded 6 May 2015]   |  

Abstract

This paper presents a study of the electrical and mechanical behavior of several continuous carbon fibers epoxy composites for both strengthening and monitoring of structures. In these composites, the arrangement of fibers was deliberately diversified to test and understand the ability of the composites for self-sensing low strains. Composites with different arrangements of fibers and textile weaves, mainly unidirectional continuous carbon reinforced composites, were tested at the dynamometer. A two-probe method was considered to measure the relative electrical resistance of these composites during loading. The measured relative electrical resistance includes volume and contact electrical resistances. For all tested specimens, it increases with an increase in tensile strain, at low strain values. This is explained by the improved alignment of fibers and resulting reduction of the number of possible contacts between fibers during loading, increasing as a consequence the contact electrical resistance of the composite. Laboratory tests on strengthening of structural elements were also performed, making hand-made composites by the “wet process”, which is commonly used in civil engineering for the strengthening of all types of structures in-situ. Results show that the woven epoxy composite, used for strengthening of concrete elements is also able to sense low deformations, below 1%. Moreover, results clearly show that this textile sensor also improves the mechanical work of the strengthened structural elements, increasing their bearing capacity. Finally, the set of obtained results supports the concept of a textile fabric capable of both structural upgrade and self-monitoring of structures, especially large structures of difficult access and needing constant, sometimes very expensive, health monitoring. View Full-Text
Keywords: structural health monitoring; carbon fibers polymer-matrix composites; self-sensing; strain sensors; electrical resistance structural health monitoring; carbon fibers polymer-matrix composites; self-sensing; strain sensors; electrical resistance
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).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Salvado, R.; Lopes, C.; Szojda, L.; Araújo, P.; Gorski, M.; Velez, F.J.; Castro-Gomes, J.; Krzywon, R. Carbon Fiber Epoxy Composites for Both Strengthening and Health Monitoring of Structures. Sensors 2015, 15, 10753-10770.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top