Research on prestressed CFRP alarm sensors

With the development of the society, structure health monitoring has become a hot research topic. In order to detect the damages located at the position where the displacement mode is unsensitive, the alarm sensors are developed. In this paper, prestressed CFRP alarm sensors have been manufactured and tested, which utilized the electrical conductive capability and piezoresistive capability of CFRP to monitor the structure status. The experiments show that prestressed CFRP alarm sensors are more sensitive in the low strain region, as they are able to reduce the strain when the electrical resistance abrupt changed.