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Proceedings Paper

Real-time monitoring of acoustic linear and nonlinear behavior of titanium alloys during low-cycle fatigue and high-cycle fatigue
Author(s): Jerome Frouin; Shamachary Sathish; Jeong K. Na
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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. 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. Real-time monitoring of the material nonlinearity has been performed on dog-bone specimens from zero fatigue all the way to the final fracture under low-cycle fatigue test condition (LCF) and high-cycle test condition (HCF). Real-time health monitoring of the material can greatly contribute to the understanding of material behavior under cyclic loading. Interpretation of the results show that correlation exist between the slope of the curve described by the material nonlinearity and the life of the component. This new methodology was developed with an objective to predict the initiation of fatigue microcracks, and to detect, in-situ fatigue crack initiation as well as to quantify early stages of fatigue damage.

Paper Details

Date Published: 13 May 2000
PDF: 8 pages
Proc. SPIE 3993, Nondestructive Evaluation of Aging Materials and Composites IV, (13 May 2000); doi: 10.1117/12.385477
Show Author Affiliations
Jerome Frouin, Univ. of Dayton (United States)
Shamachary Sathish, Univ. of Dayton (United States)
Jeong K. Na, Consultant (United States)

Published in SPIE Proceedings Vol. 3993:
Nondestructive Evaluation of Aging Materials and Composites IV
George Y. Baaklini; Carol A. Nove; Eric S. Boltz, Editor(s)

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