Hole-edge damage of joint structure is one type of the most closely watched damages for ultrahigh buildings, bridges, aircrafts, etc., due to stress concentration at the bolt hole and complex load conditions. This paper employs an eddy current array sensor, made by flexible printed circuit technology, bonded on the bolt screw to monitor the growth of hole-edge damage. Coil winding configuration of the eddy current array sensor made by one actuation coil throughout all depth and several sensing coils along the depth is proposed to quantify the damage growth, especially the damage depth. Simulation and experimental study were conducted to verify the ability of quantitatively monitoring the hole-edge damage growth.
Guided wave-based structural health monitoring (SHM) has been given considerable attention and widely studied for large-scale aircraft structures. Nevertheless, it is difficult to apply SHM systems on board or online, for which one of the most serious reasons is the environmental influence. Load is one fact that affects not only the host structure, in which guided wave propagates, but also the PZT, by which guided wave is transmitted and received. In this paper, numerical analysis using finite element method is used to study the load effect on guided wave acquired by PZT. The static loads with different grades are considered to analyze its effect on guided wave signals that PZT transmits and receives. Based on the variation trend of guided waves versus load, a load compensation method is developed to eliminate effects of load in the process of damage detection. The probabilistic reconstruction algorithm based on the signal variation of transmitter-receiver path is employed to identify the damage. Numerical tests is conducted to verify the feasibility and effectiveness of the given method.
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