Identification of material damage precursors using nonlinear ultrasonics

Gheorghe Bunget, Adam Goff, Nathan K. Brown, Jeff Demo, Fritz Friedersdorf, Anindya Ghoshal, Marc Pepi, Siddhant Datta, Aditi Chattopadhyay

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


The primary goal of this research effort is to develop nondestructive evaluation techniques capable of detecting material damage precursors mainly for turbine engine materials under low and high-cycle fatigue testing. The experimental results presented in this paper show a significant increase of the relative acoustic nonlinearity, βr, in aluminum and Ni-based superalloy fatigued specimens. While in agreement with the prior research, the main advantage of the current technique over the previous methods is that the ultrasonic beam may be focused to inspect the presence of damage precursors at localized stress concentrator site. For example, when the ultrasonic beam travelled through the root of the round-notched specimens, the acoustic nonlinearity exhibited an increase of approximately 450% as compared to the pristine specimens. This procedure will be further developed to detect damage precursors in propulsion components undergoing thermo-mechanically fatigue to quantify their remaining useful life.

Original languageEnglish (US)
Title of host publication51st AIAA/SAE/ASEE Joint Propulsion Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103216
StatePublished - 2015
Event51st AIAA/SAE/ASEE Joint Propulsion Conference, 2015 - Orlando, United States
Duration: Jul 27 2015Jul 29 2015


Other51st AIAA/SAE/ASEE Joint Propulsion Conference, 2015
Country/TerritoryUnited States

ASJC Scopus subject areas

  • General Engineering


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