The bolted joint is the most common connection method for composite structures in aircraft. Due to the characteristics of the composite bolted joint itself and the complexity of the load and service environment

it is very difficult to analyze the integrity and durability of the composite bolted joint. It is very challengeable to effectively and intelligently monitor the service condition of composite bolted joints in real time

as well as to diagnose and evaluate their reliability and integrity on-line. In this paper

the damage monitoring technology of advanced carbon fiber reinforced composite bolted joint based on flexible eddy current sensor array film and carbon-based nanopiezoresistive sensor is proposed and developed. The sensor monitoring principle

the sensor preparation process

and the sensor-bolt integration scheme are systematically described. In order to verify the monitoring functions of the proposed advanced sensing techniques

a series of experiments are conducted

and the experimental results show that these advanced sensing techniques have a good ability to identify damage patterns and quantify damage parameters.