Campus Units
Civil, Construction and Environmental Engineering, Electrical and Computer Engineering, Center for Nondestructive Evaluation (CNDE)
Document Type
Article
Publication Version
Accepted Manuscript
Publication Date
7-11-2017
Journal or Book Title
Smart Materials and Structures
Volume
26
Issue
8
First Page
085024
DOI
10.1088/1361-665X/aa75ef
Abstract
This paper presents a novel large-area strain sensing technology for monitoring fatigue cracks in steel bridges. The technology is based on a soft elastomeric capacitor (SEC), which serves as a flexible and large-area strain gauge. Previous experiments have verified the SEC's capability to monitor low-cycle fatigue cracks experiencing large plastic deformation and large crack opening. Here an investigation into further extending the SEC's capability for long-term monitoring of fatigue cracks in steel bridges subject to traffic loading, which experience smaller crack openings. It is proposed that the peak-to-peak amplitude (pk–pk amplitude) of the sensor's capacitance measurement as the indicator of crack growth to achieve robustness against capacitance drift during long-term monitoring. Then a robust crack monitoring algorithm is developed to reliably identify the level of pk–pk amplitudes through frequency analysis, from which a crack growth index (CGI) is obtained for monitoring fatigue crack growth under various loading conditions. To generate representative fatigue cracks in a laboratory, loading protocols were designed based on constant ranges of stress intensity to limit plastic deformations at the crack tip. A series of small-scale fatigue tests were performed under the designed loading protocols with various stress intensity ratios. Test results under the realistic fatigue crack conditions demonstrated the proposed crack monitoring algorithm can generate robust CGIs which are positively correlated with crack lengths and independent from loading conditions.
Research Focus Area
Structural Engineering, Geotechnical/Materials Engineering
Copyright Owner
IOP Publishing Ltd.
Copyright Date
2017
Language
en
Recommended Citation
Kong, Xiangxiong, "A large-area strain sensing technology for monitoring fatigue cracks in steel bridges" (2017). Civil, Construction and Environmental Engineering Publications. 147.
https://lib.dr.iastate.edu/ccee_pubs/147
Included in
Civil Engineering Commons, Controls and Control Theory Commons, Structural Engineering Commons, VLSI and Circuits, Embedded and Hardware Systems Commons
Comments
This is a manuscript of an article published as Kong, Xiangxiong, Jian Li, William Collins, Caroline Bennett, Simon Laflamme, and Hongki Jo. "A large-area strain sensing technology for monitoring fatigue cracks in steel bridges." Smart Materials and Structures 26, no. 8 (2017): 085024. DOI: 10.1088/1361-665X/aa75ef. Posted with permission.