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Ultrasonic Linear and Nonlinear Behavior of Fatigued Ti–6Al–4V

Published online by Cambridge University Press:  31 January 2011

Jerome Frouin ,
Shamachary Sathish ,
Theodore E. Matikas  and
Jeong K. Na
Jerome Frouin
Affiliation:
Center for Materials Diagnostics, University of Dayton, 300 College Park, Dayton, Ohio 45469–0121
Shamachary Sathish
Affiliation:
Center for Materials Diagnostics, University of Dayton, 300 College Park, Dayton, Ohio 45469–0121
Theodore E. Matikas
Affiliation:
Center for Materials Diagnostics, University of Dayton, 300 College Park, Dayton, Ohio 45469–0121
Jeong K. Na
Affiliation:
Center for Materials Diagnostics, University of Dayton, 300 College Park, Dayton, Ohio 45469–0121
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Abstract

The change in ultrasonic nonlinear property of a titanium alloy subjected to cyclic loading has been studied, with an objective to develop a new characterization methodology for quantifying the level of damage in the material undergoing fatigue. In order to determine the degree of nonlinearity, the ultrasonic second harmonic generation technique has been used. The second harmonic signal was monitored during the fatigue process, and a substantial increase in the second harmonic amplitude (180% increase in nonlinear factor) was observed. This indicates that the second harmonic signal is very sensitive to the microstructural changes in the material caused by fatigue.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 4 , April 1999 , pp. 1295 - 1298
Copyright
Copyright © Materials Research Society 1999

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References

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