1. Calibration of piezoresistive shape-memory alloy strain sensors.
- Author
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Mäder, Thomas, Heusinger, Jonas v, Senf, Björn, Zoch, Martin, Winkler, Anja, and Drossel, Welf-Guntram
- Subjects
STRAIN sensors ,STRAIN gages ,FATIGUE limit ,REINFORCED plastics ,STRUCTURAL health monitoring ,STRAINS & stresses (Mechanics) ,SHAPE memory alloys - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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