TY - GEN
T1 - Micro-damage evaluation and remaining fatigue life assessment with nonlinear vibro-modulation technique
AU - Donskoy, Dimitri
AU - Chudnovsky, Alexander
AU - Zagrai, Andrei
AU - Golovin, Edward
PY - 2008
Y1 - 2008
N2 - 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.
AB - 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.
KW - Damage index
KW - Fatigue life prediction
KW - Micro-damage monitoring
KW - Nonlinear acoustics
KW - Vibro-modulation technique
UR - http://www.scopus.com/inward/record.url?scp=49149086651&partnerID=8YFLogxK
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U2 - 10.1063/1.2956269
DO - 10.1063/1.2956269
M3 - Conference contribution
AN - SCOPUS:49149086651
SN - 9780735405448
T3 - AIP Conference Proceedings
SP - 509
EP - 512
BT - Nonlinear Acoustics - Fundamentals and Applications - ISNA18 - 18th International Symposium on Nonlinear Acoustics
T2 - 18th International Symposium on Nonlinear Acoustics, ISNA18
Y2 - 7 July 2008 through 10 July 2008
ER -