Detection of steel fatigue cracks with strain sensing sheets based on large area electronics

Research output: Contribution to conferencePaperpeer-review

Abstract

Reliable early-stage damage detection requires continuous monitoring over large areas of structure, and with high spatial resolution of sensors. Technologies based on Large Area Electronics (LAE) can enable direct sensing and can be scaled to the level required for Structural Health Monitoring (SHM), in which thin-film strain sensors and control circuits are integrated on the flexible electronics and deposited on a polyimide sheet that can cover large areas of structures. This paper presents the development stage of a prototype strain sensing sheet based on LAE for crack detection and localization. Two types of sensing-sheet interconnections with size 6x6 inch were designed and manufactured, and dense arrays of strain sensors were laminated onto the interconnections. The sensing sheets were bonded to steel plates, which had a notch on the boundary so that fatigue cracks could be generated under cyclic loading. The sensors within the sheet that were close to the notch tip successfully detected the initialization of fatigue crack and localized the damage on the plate. The sensors that were away from the crack successfully detected the propagation of fatigue crack based on the time history of measured strain. Thus, the results of the tests validated general principles of the sensing sheets for crack detection.

Original languageEnglish (US)
StatePublished - Jan 1 2015
Event7th International Conference on Structural Health Monitoring of Intelligent Infrastructure, SHMII 2015 - Torino, Italy
Duration: Jul 1 2015Jul 3 2015

Other

Other7th International Conference on Structural Health Monitoring of Intelligent Infrastructure, SHMII 2015
CountryItaly
CityTorino
Period7/1/157/3/15

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Civil and Structural Engineering
  • Artificial Intelligence

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