Journal
IEEE SENSORS JOURNAL
Volume 20, Issue 21, Pages 12652-12660Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2020.3002388
Keywords
Strain gauge; screen printing; silver-carbon composite; micro-strain; structural health monitoring; linear sensitivity; transverse sensitivity; temperature coefficient resistance (TCR)
Funding
- NextFlex under Air Force Research Laboratory (AFRL) Cooperative [FA8650-15-25401]
- NSF Award [1701157]
- Directorate For Engineering
- Div Of Industrial Innovation & Partnersh [1701157] Funding Source: National Science Foundation
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Aprinted strain gaugebasedonmetal/non-metal composite was successfully fabricated and tested for micro-strain (mu epsilon) detection. A silver ink was blended with a carbon ink to achieve a silver-carbon (Ag/C) composite ink. The composite ink was then screen printed on a polyimide substrate in a meandering pattern to achieve a desired resistance of similar to 350 Omega. The printed strain gauge was bonded on to a flat aluminum beam. The capability of the printed strain gauge to detect linear strain was investigated by applying varying tensile and compressive loads on the aluminum beam, to simulate mu epsilon. Corresponding linear gauge factors for tensile and compressive loads were calculated as 2.26 and 1.47, respectively. In addition, transverse gauge factors for tensile and compressive loads were calculated as 1.18 and 0.43, respectively. The strain gauge has a temperature coefficient resistance of 0.26%/degrees C. The screen-printed Ag/C composite strain gauge was also compared to a commercial strain gauge of similar gauge resistance. The results demonstrate that a strain gauge with screen-printed Ag/C and encapsulation ink on a polyimide substrate can be utilized for mu epsilon detection. The electromechanical response of the fabricated strain gauge as a function of resistance is investigated and presented in this paper.
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