Author details

very promising and piezo-resistive flexible sensor was responding very well to the

In this study, a flexible strain sensor was fabricated using the electroplating process. The coating was carried out on nylon yarn, and it appeared thin and uniform. Then, the strain sensor was characterized and tested experimentally, and its behavior verified numerically. The results were very encouraging and reproducible. Next, the yarn sensor was incorporated into a composite material and standardized specimens were prepared and tested. The signal from the sensor was correlated perfectly with the local stress-signal of the composite panel. The follow-

• It confirmed the feasibility of fabricating a flexible strain sensor. The sensor was made of nylon yarn, coated with silver. The resistivity change was recorded in the elastic-plastic region, which showed that these flexible strain sensor wires can be used for SHM in different structures and can sense

• Numerical results verified damage behavior, that is, ductile failure and flaking

• It was found that the incorporation of these sensor wires would not affect the

off of coating as seen in experimentally fractured samples.

mechanical change in the composite specimen.

Advances in Structural Health Monitoring

Electrical response of the sensor with mechanical behavior of composite specimen.

ing conclusions are drawn from this study:

deformation or damage prior to failure.

structural integrity of the specimen.

8. Conclusions

108

Figure 12.

Yumna Qureshi<sup>1</sup> , Mostapha Tarfaoui1,2\*, Khalil K. Lafdi3 and Khalid Lafdi<sup>2</sup>

1 ENSTA Bretagne, IRDL-FRE CNRS 3744, Brest, France

2 University of Dayton, Dayton, OH, United States

3 Ohio Connections Academy, Mason, Ohio, United States

\*Address all correspondence to: mostapha.tarfaoui@ensta-bretagne.fr

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
