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Proceedings Paper

In-situ monitoring of acoustic linear and nonlinear behavior of titanium alloys during cycling loading
Author(s): Jerome Frouin; Theodore E. Matikas; Jeong K. Na; Shamachary Sathish
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Paper Abstract

An in-situ technique to measure sound velocity, ultrasonic attenuation and acoustic nonlinear property has been developed for characterization and early detection of fatigue damage in aerospace materials. A previous experiment using the f-2f technique on Ti-6Al-4V dog bone specimen fatigued at different stage of fatigue has shown that the material nonlinearity exhibit large change compared to the other ultrasonic parameter. Real-time monitoring of the nonlinearity may be a future tool to characterize early fatigue damage in the material. For this purpose we have developed a computer software and measurement technique including hardware for the automation of the measurement. New transducer holder and special grips are designed. The automation has allowed us to test the long-term stability of the electronics over a period of time and so proof of the linearity of the system. For the first time, a real-time experiment has been performed on a dog-bone specimen from zero fatigue al the way to the final fracture.

Paper Details

Date Published: 8 February 1999
PDF: 10 pages
Proc. SPIE 3585, Nondestructive Evaluation of Aging Materials and Composites III, (8 February 1999); doi: 10.1117/12.339838
Show Author Affiliations
Jerome Frouin, Univ. of Dayton (United States)
Theodore E. Matikas, Univ. of Dayton (United States)
Jeong K. Na, Univ. of Dayton (United States)
Shamachary Sathish, Univ. of Dayton (United States)

Published in SPIE Proceedings Vol. 3585:
Nondestructive Evaluation of Aging Materials and Composites III
George Y. Baaklini; Carol A. Nove; Eric S. Boltz, Editor(s)

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