Finite element evaluation of EMI-based structural health monitoring in high frequencies

Mohsen Safaei; Eric C. Nolan; Steven R. Anton

doi:10.1117/12.2514336

1 April 2019 Finite element evaluation of EMI-based structural health monitoring in high frequencies

Mohsen Safaei, Eric C. Nolan, Steven R. Anton

Proceedings Volume 10972, Health Monitoring of Structural and Biological Systems XIII; 109720C (2019) https://doi.org/10.1117/12.2514336
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States

Abstract

Structural health monitoring (SHM) is a growing field with many applications in the aerospace, civil, and mining industries. There has been a desire to develop SHM systems to operate in the microsecond timescale during highly dynamic events. Current efforts have focused on creating an impedance measurement system using the electromechanical impedance (EMI) method technique. In order to consider ways to decrease the time required to measure the impedance of a system, researchers have considered taking measurements at higher frequencies. As part of this research, it is important to consider the sensitivities and capabilities of the sensors to detect changes in the structure at higher frequencies (up to MHz). The goal for this study is to evaluate the sensitivity of the EMI method to damage using a PZT disk bonded to a cantilevered aluminum beam using a finite element (FE) model as well as experimental data. Damage was created by adding holes along the length of the beam, incrementally moving closer to the PZT disk. As a result of this study, an FE model has been developed using previously introduced methods to characterize the material properties of a PZT disk with an optimization algorithm. While initial coefficients resulted in a significant deviation of FE resonance peaks from experimental results, when using the optimized parameters the FE model accurately matches the experimental data. Modeling of the PZT when bonded to the aluminum beam showed a similar trend, there is not an exact match between the model and experimental data. This can be attributed to the material properties of the aluminum beam, which are from a general data sheet for the 6061-T6 and not data from the actual beam. In addition, the bonding layer is not modeled in the FE simulation, which can be a cause of the error in the modeling results. In both the model and experimental data, indications of damage from the impedance curves occurred below 600 kHz.

Conference Presentation

Citation Download Citation

Mohsen Safaei, Eric C. Nolan, and Steven R. Anton "Finite element evaluation of EMI-based structural health monitoring in high frequencies", Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 109720C (1 April 2019); https://doi.org/10.1117/12.2514336

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available