Micro-damage evaluation and remaining fatigue life assessment with nonlinear vibro-modulation technique

Dimitri Donskoy, Alexander Chudnovsky, Andrei Zagrai, Edward Golovin

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

4 Scopus citations

Abstract

Assessment of structural deterioration due to in-service and environmental loads is an essential element in ensuring safety, operability and long life of various structures and structural components. We applied vibro-acoustic modulation technique to monitor material degradation at the micro/meso scale before the onset of the macro-scale fracture. The technique explores nonlinear acoustic interaction of high frequency ultrasound and low frequency structural vibration at the site of the incipient damage. It is shown that micro/meso scale degradation increases the material nonlinearity leading to modulation of the high frequency ultrasonic signal by low frequency vibration, quantified by the nonlinear acoustic Damage Index (DI). Numerous tests with hundreds of test coupons proved high sensitivity of the developed technique to micro/meso scale fatigue damage accumulation. The study further demonstrated that the remaining life of the fatigued material can be predicted using phenomenological damage accumulation rule expressed through measured Damage Index.

Original languageEnglish
Title of host publicationNonlinear Acoustics - Fundamentals and Applications - ISNA18 - 18th International Symposium on Nonlinear Acoustics
Pages509-512
Number of pages4
DOIs
StatePublished - 2008
Event18th International Symposium on Nonlinear Acoustics, ISNA18 - Stockholm, Sweden
Duration: 7 Jul 200810 Jul 2008

Publication series

NameAIP Conference Proceedings
Volume1022
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference18th International Symposium on Nonlinear Acoustics, ISNA18
Country/TerritorySweden
CityStockholm
Period7/07/0810/07/08

Keywords

  • Damage index
  • Fatigue life prediction
  • Micro-damage monitoring
  • Nonlinear acoustics
  • Vibro-modulation technique

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