@inproceedings{37576a79a5714a2d90c652cf4f226af8,
title = "Micro/meso scale fatigue damage accumulation monitoring using nonlinear acoustic vibro-modulation measurements",
abstract = "Monitoring the incipient damage at the earliest possible stage is essential for predicting structural performance and remaining life of structural components. Existing prognostic methodologies incorporate conventional SHM and NDE techniques responsive to cracks and delaminations resulted from the irreversible material fracture and disintegration at the macro-scale. There is an increasing need for technologies that could allow for monitoring material degradation at the micro/meso scale before the onset of the macro-scale fracture. In this contribution, we report results of the real-time monitoring of the material micro/meso scale degradation using the nonlinear acoustic vibro-modulation technique. The technique explores nonlinear acoustic interaction of high frequency ultrasound and low frequency structural vibration at the site of the incipient damage. The indicator of the damage severity, nonlinear acoustic damage index (DI), was measured in real time during the strain-controlled three-point bending fatigue test of aluminum and steel specimens. Nondestructively, degradation of the specimen was revealed through the increase in the DI, which correlated well with the respective decrease in the specimen's stiffness. Destructive SEM examination confirmed sensitivity of the DI to the incipient micro/meso scale damage and advocated for utilizing the vibro-modulation approach for assessment of material degradation before fracture.",
keywords = "Damage detection, Micro-scale damage, Nondestructive, Nonlinear acoustics, Prognosis, Structural health monitoring",
author = "Andrei Zagrai and Dimitri Donskoy and Alexander Chudnovsky and Edward Golovin and Agarwala, {Vinod S.}",
year = "2006",
doi = "10.1117/12.658558",
language = "English",
isbn = "0819462284",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Testing, Reliability, and Application of Micro- and Nano-Material Systems IV",
note = "Testing, Reliability, and Application of Micro- and Nano-Material Systems IV ; Conference date: 28-02-2006 Through 02-03-2006",
}