Research on identification and monitoring method of bolt connection loosening based on piezoresistive effect

Abstract Bolted connection is commonly used in the joint connection of engineering structures, and its connection reliability plays an important role in ensuring the service performance of engineering structures. In complex service environment, bolt connection is easy to loose. In order to identify and monitor bolt connection looseness, a bolt looseness monitoring device based on piezoresistive effect is designed and manufactured in this paper. The feasibility of the device is verified through flange bolt looseness identification test. The results show that the monitoring device can effectively identify the minor bolt loosening damage, and the identification results have good stability, and the bolt loosening can be deduced based on the variation of the conductance value. The bolting connection loosening monitoring method based on piezoresistivity effect proposed in this paper can provide a reference for the identification and monitoring of bolt loosening.