Material microstructure and ultrasonic nonlinearity

Aurora A. Zinck, Sridhar Krishnaswamy

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Ultrasonic nonlinearity measurements have been suggested as an effective tool for the early detection of fatigue damage in metallic structures. However, the correlation between ultrasonic nonlinearity and material damage induced by fatigue or plastic deformation has been observed to be non-monotonic by several researchers including by our group. To clarify the correlation between microstructure and ultrasonic nonlinearity, the nonlinear ultrasonic behavior of polycrystalline copper is observed at multiple stages of monotonic loading; while under tension, at the loaded peak, while unloading, and after loading. The microstructures corresponding to changes in nonlinearity are examined using hardness testing and transmission electron microscopy. In this system, ultrasonic nonlinearity does not monotonically increase with increased strain and dislocation density. Models that explain drops in nonlinearity are suggested, and destructive testing is used to support findings.

Original languageEnglish (US)
Title of host publication2013 IEEE International Ultrasonics Symposium, IUS 2013
Number of pages4
StatePublished - Dec 1 2013
Event2013 IEEE International Ultrasonics Symposium, IUS 2013 - Prague, Czech Republic
Duration: Jul 21 2013Jul 25 2013

Publication series

NameIEEE International Ultrasonics Symposium, IUS
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727


Other2013 IEEE International Ultrasonics Symposium, IUS 2013
Country/TerritoryCzech Republic

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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