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.
Advanced fiber reinforced composite materials are becoming the main structural materials of next generation of aircraft because of their high strength and stiffness to weight ratios, and excellent designability. As key components of large composite structures, joints play important roles to ensure the integrity of the composite structures. However, it is very difficult to analyze the strength and failure modes of composite joints due to their complex nonlinear coupling factors. Therefore, there is a need to monitor, diagnose, evaluate and predict the structure state of composite joints. This paper proposes a multi-field coupled sensing network for health monitoring of composite bolted joints. Major work of this paper includes: 1) The concept of multifunctional sensor layer integrated with eddy current sensors, Rogowski coil and arrayed piezoelectric sensors; 2) Development of the process for integrating the eddy current sensor foil, Rogowski coil and piezoelectric sensor array in multifunctional sensor layer; 3) A new concept of smart composite joint with multifunctional sensing capability. The challenges for building such a structural state sensing system and some solutions to address the challenges are also discussed in the study.
Conference Committee Involvement (11)
Health Monitoring of Structural and Biological Systems XIX
17 March 2025 | Vancouver, B.C., Canada
Health Monitoring of Structural and Biological Systems XVIII
25 March 2024 | Long Beach, California, United States
Health Monitoring of Structural and Biological Systems XVII
13 March 2023 | Long Beach, California, United States
Health Monitoring of Structural and Biological Systems XVI
7 March 2022 | Long Beach, California, United States
Health Monitoring of Structural and Biological Systems XV
8 March 2021 | Online Only, California, United States
Health Monitoring of Structural and Biological Systems XIV
27 April 2020 | Online Only, California, United States
Health Monitoring of Structural and Biological Systems XIII
4 March 2019 | Denver, Colorado, United States
Health Monitoring of Structural and Biological Systems XII
5 March 2018 | Denver, Colorado, United States
Health Monitoring of Structural and Biological Systems XI
26 March 2017 | Portland, Oregon, United States
Health Monitoring of Structural and Biological Systems X
21 March 2016 | Las Vegas, Nevada, United States
Health Monitoring of Structural and Biological Systems IX
9 March 2015 | San Diego, California, United States
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