Title
Model calibration for a soft elastomeric capacitor sensor considering slippage under fatigue cracks
Campus Units
Civil, Construction and Environmental Engineering, Electrical and Computer Engineering, Center for Nondestructive Evaluation (CNDE)
Document Type
Conference Proceeding
Conference
SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring
Publication Version
Published Version
Publication Date
4-20-2016
Journal or Book Title
Proceedings of SPIE
Volume
9803
Issue
98032P
First Page
98032P-1
Last Page
98032P-9
Research Focus Area
Structural Engineering
DOI
10.1117/12.2219508
Conference Title
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
Conference Date
March 21-24, 2016
City
Las Vegas, NV
Abstract
A newly-developed soft elastomeric capacitor (SEC) strain sensor has shown promise in fatigue crack monitoring. The SECs exhibit high levels of ductility and hence do not break under excessive strain when the substrate cracks due to slippage or de-bonding between the sensor and epoxy. The actual strain experienced by a SEC depends on the amount of slippage, which is difficult to simulate numerically, making it challenging to accurately predict the response of a SEC near a crack. In this paper, a two-step approach is proposed to simulate the capacitance response of a SEC. First, a finite element (FE) model of a steel compact tension specimen was analyzed under cyclic loading while the cracking process was simulated based on an element removal technique. Second, a rectangular boundary was defined near the crack region. The SEC outside the boundary was assumed to have perfect bond with the specimen, while that inside the boundary was assumed to deform freely due to slippage. A second FE model was then established to simulate the response of the SEC within the boundary subject to displacements at the boundary from the first FE model. The total simulated capacitance was computed from the model results by combining the computed capacitance inside and outside the boundary. The performance of the simulation incorporating slippage was evaluated by comparing the model results with the experimental data from the test performed on a compact tension specimen. The FE model considering slippage showed results that matched the experimental findings more closely than the FE model that did not consider slippage.
Copyright Owner
Society of Photo-Optical Instrumentation Engineers (SPIE)
Copyright Date
2016
Language
en
File Format
application/pdf
Recommended Citation
Kong, Xiangxiong; Li, Jian; Bennett, Caroline; Collins, William; and Laflamme, Simon, "Model calibration for a soft elastomeric capacitor sensor considering slippage under fatigue cracks" (2016). Civil, Construction and Environmental Engineering Conference Presentations and Proceedings. 53.
https://lib.dr.iastate.edu/ccee_conf/53
Included in
Civil Engineering Commons, Structural Engineering Commons, VLSI and Circuits, Embedded and Hardware Systems Commons
Comments
Xiangxiong Kong, Jian Li, Caroline Bennett, William Collins, Simon Laflamme, "Model calibration for a soft elastomeric capacitor sensor considering slippage under fatigue cracks", Proc. SPIE 9803, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016, 98032P (20 April 2016); doi: 10.1117/12.2219508. Posted with permission.