Abstract
In this work, a piezoresistive multi-walled carbon nanotube (CNT)/epoxy composite strain sensor was developed. The sensor was developed for low strain applications and therefore investigated on a steel rod in the elastic region. A mixture of Bisphenol A and Bisphenol F based epoxy was used as the matrix with multiwalled CNTs as the filler. The stability of the strain sensor was investigated. The sensor was tested static, semi-dynamic and dynamic under influence of tensile and compressive strain on a servo hydraulic 1-axle test rig. The corresponding change in resistance was measured using a Wheatstone quarter bridge. The strain sensor was fabricated directly onto an electrically insulated steel object and tested at different frequencies alternating between tension and compression. It was found that at load/unload cycles with frequencies up to 5Hz the composite strain sensor was showing a linear behavior and the stability was maintained for over 1000 cycles.
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