Nonlinear ultrasonic characteristics: Identification and use for damage prognosis

M. R. Hajj, J. C. Duke, B. Yoo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This work aims at the development of system interrogation parameters that are highly sensitive to damage accumulation from the earliest stages of the fatigue process. The approach taken is to develop a nonlinear parameter that is based on a quantification of the level of the nonlinear relation between the excitation and its harmonic rather than on their spectral amplitudes. Ultrasonic measurements are performed on a 7075 aluminum specimen after equal intervals of loading cycles that ended with its failure. Higher-order spectral moments are used to quantify the extent of nonlinear coupling between the excitation and its harmonic and develop a nonlinear parameter for the ultrasonic wave propagation. Variations in the value of this parameter with the number of cycles are determined. An explanation for these variations is presented.

Original languageEnglish
Title of host publicationCollection of Technical Papers - 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Subtitle of host publication14th AIAA/ASME/AHS Adaptive Structures Conference, 8th AIAA Non-deterministic App
Pages7740-7746
Number of pages7
DOIs
StatePublished - 2006
Event47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference - Newport, RI, United States
Duration: 1 May 20064 May 2006

Publication series

NameCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Volume11
ISSN (Print)0273-4508

Conference

Conference47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Country/TerritoryUnited States
CityNewport, RI
Period1/05/064/05/06

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