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Article
Smart sensing skin for detection and localization of fatigue cracks
Smart Materials and Structures
  • Sari Kharroub, Iowa State University
  • Simon Laflamme, Iowa State University
  • Chunhui Song, Iowa State University
  • Daji Qiao, Iowa State University
  • Brent M. Phares, Iowa State University
  • Jian Li, University of Kansas
Document Type
Article
Publication Version
Submitted Manuscript
Publication Date
3-10-2015
DOI
10.1088/0964-1726/24/6/065004
Abstract
Fatigue cracks on steel components may have strong consequences on the structure's serviceability and strength. Their detection and localization is a difficult task. Existing technologies enabling structural health monitoring have a complex link signal-to-damage or have economic barriers impeding large-scale deployment. A solution is to develop sensing methods that are inexpensive, scalable, with signals that can directly relate to damage. The authors have recently proposed a smart sensing skin for structural health monitoring applications to mesosystems. The sensor is a thin film soft elastomeric capacitor (SEC) that transduces strain into a measurable change in capacitance. Arranged in a network configuration, the SEC would have the capacity to detect and localize damage by detecting local deformation over a global surface, analogous to biological skin. In this paper, the performance of the SEC at detecting and localizing fatigue cracks in steel structures is investigated. Fatigue cracks are induced in steel specimens equipped with SECs, and data measured continuously. Test results show that the fatigue crack can be detected at an early stage. The smallest detectable crack length and width are 27.2 and 0.254 mm, respectively, and the average detectable crack length and width are 29.8 and 0.432 mm, respectively. Results also show that, when used in a network configuration, only the sensor located over the formed fatigue crack detect the damage, thus validating the capacity of the SEC at damage localization.
Comments

This is a manuscript of an article from Smart Materials and Structures; 24(6)2015;1-16. Doi: 10.1088/0964-1726/24/6/065004. Posted with permission.

Copyright Owner
IOP Publishing Ltd
Language
en
File Format
application/pdf
Citation Information
Sari Kharroub, Simon Laflamme, Chunhui Song, Daji Qiao, et al.. "Smart sensing skin for detection and localization of fatigue cracks" Smart Materials and Structures Vol. 24 Iss. 6 (2015) p. 1 - 16
Available at: http://works.bepress.com/simon_laflamme/33/