Monitoring surface breaking defects in beams with piezoelectric sensors and actuators

Sergio Ricardo Kokai Morikawa; Antonio Lopes Gama; Arthur M.B. Braga

doi:10.1117/12.436541

16 August 2001 Monitoring surface breaking defects in beams with piezoelectric sensors and actuators

Sergio Ricardo Kokai Morikawa, Antonio Lopes Gama, Arthur M.B. Braga

Proceedings Volume 4327, Smart Structures and Materials 2001: Smart Structures and Integrated Systems; (2001) https://doi.org/10.1117/12.436541
Event: SPIE's 8th Annual International Symposium on Smart Structures and Materials, 2001, Newport Beach, CA, United States

Abstract

This paper reports results of the application of a simple technique that explores the use of piezoelectric actuators and sensors to monitor the growth of surface breaking defects in beams. The method consists in exciting the structure with piezoelectric actuators, subjected to either a single frequency or broad-band signal, while recording the electromechanical response of sensors placed close to the defect. Piezoelectric sensors detect the damage growth by monitoring changes in the dynamic strain field induced by the actuator near the defect. The performance of this methodology was assessed through experiments in beams containing surface breaking fatigue cracks or machined slots. Results have shown that the choice of adequate parameters, such as sensor size and its distance to the crack edge, allows the detection of small changes in defect depth. Finite element simulations were also performed to determine a correlation between sensor response, sensor location, and damage size. Results from tests performed in a three-dimensional framed structure are also presented.

Citation Download Citation

Sergio Ricardo Kokai Morikawa, Antonio Lopes Gama, and Arthur M.B. Braga "Monitoring surface breaking defects in beams with piezoelectric sensors and actuators", Proc. SPIE 4327, Smart Structures and Materials 2001: Smart Structures and Integrated Systems, (16 August 2001); https://doi.org/10.1117/12.436541

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