Damage Precursor Indicator for Aluminum 7075-T6 Based on Nonlinear Dynamics

Robert A. Haynes*, Ed Habtour, Todd C. Henry, Daniel P. Cole, Volker Weiss, Antonios Kontsos, Brian Wisner

*Corresponding author for this work

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

4 Citations (Scopus)


In this work, a damage precursor indicator for aluminum 7075-T6 is proposed based on the nonlinear dynamics of a cantilevered beam system. A shouldered beam specimen is used to move the region of highest stress away from the clamped end. The beam is subject to harmonic base excitation in a uniaxial shaker. Fatigue damage accumulates in the beam with damage forming most quickly in the region of highest stress. By monitoring the tip deflection, changes in the natural frequency and response to a given excitation are correlated to fatigue life. Despite the absence of large-scale cracks, detectable changes in the nonlinear dynamics are discovered. The nonlinear dynamic parameters are estimated capturing the change in the forward and backward nonlinear sine sweeps. These changes could lend themselves to being a trackable damage precursor. The presence of microstructural precursors are confirmed using nanoindentation.
Original languageEnglish
Title of host publicationNonlinear Dynamics
Subtitle of host publicationProceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018
EditorsGaetan Kerschen
Place of PublicationCham
Number of pages11
ISBN (Electronic)978-3-319-74280-9
ISBN (Print)978-3-319-74279-3
Publication statusPublished - 2019
Externally publishedYes
Event36th Conference and Exposition on Structural Dynamics, IMAC 2018 - Orlando, United States
Duration: 12 Feb 201815 Feb 2018
Conference number: 36

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


Conference36th Conference and Exposition on Structural Dynamics, IMAC 2018
Abbreviated titleIMAC
CountryUnited States
Internet address


  • Fatigue damage precursors
  • Micromechanics
  • Nonlinear dynamics
  • Structural health monitoring
  • Vibration


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