Calibration of piezoresistive shape-memory alloy strain sensors
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
Continuous strain measurement on fibre-reinforced structures demands mechanical sensors with superior fatigue resistance. Shape-memory alloy wires are predestined for strain sensors utilising their strong piezo-resistance. Calibration of these sensors is necessary in order to extract mechanical data. Therefore, four-point bending of glass-fibre reinforced plastic specimens with applied strain sensors and an optical reference measuring system is used to calibrate and compare shape-memory alloy sensors and standard strain gauges. The gauge factor and its standard deviation is successfully measured by this calibration method. Shape-memory alloy sensors show strain-dependent gauge factor whilst standard strain gauges show a constant strain sensitivity, both with a narrow stochastic distribution. Shape-memory alloy mechanical sensors are reliable to determine strain of fibre-reinforced structures. This offers the possibility to use them in structural health monitoring applications of such structures. Consequently, the four-point bending calibration using glass-fibre reinforced specimens represents a suitable possibility for calibration of strain sensors exposed to higher strain amplitudes.
Details
Original language | English |
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Pages (from-to) | 1465-1472 |
Number of pages | 8 |
Journal | Journal of intelligent material systems and structures |
Volume | 33 |
Issue number | 11 |
Early online date | 4 Nov 2021 |
Publication status | Published - 1 Jul 2022 |
Peer-reviewed | Yes |
External IDs
ORCID | /0000-0002-8854-7726/work/142242066 |
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Keywords
DFG Classification of Subject Areas according to Review Boards
ASJC Scopus subject areas
Keywords
- Calibration, fatigue, mechanical sensors, piezoresistance, shape-memory alloys, strain measurement