TY - GEN
T1 - Nonlinear vibro-acoustic modulation technique for life prediction of aging aircraft components
AU - Donskoy, D.
AU - Zagrai, A.
AU - Chudnovsky, A.
AU - Golovin, E.
AU - Agarwala, V.
PY - 2006
Y1 - 2006
N2 - Assessment of structural deterioration due to in-service and environmental loads is an essential element in ensuring safety, operability and long life of civilian and military aircrafts. Even for relatively new structures early signs material deterioration can be observed at the micro-scale. Material degradation often progresses further leading to coalescence of micro-failures and formation of one or several macro-cracks. Although the onset of the macro-scale cracking can be reliably detected by modern SHM methods, there is an increasing need for inspection technologies that may allow for assessing structural damage at a wide range of material scales, i.e. from micro to macro. This contribution presents a nonlinear acoustic vibro-acoustic modulation technique (VAMT) that is sensitive to micro and macro scale material imperfections ranging from dislocations conglomerations to delaminations and cracks. VMT utilizes a combined excitation comprising of a high frequency ultrasonic wave and low frequency vibrations that interact at the damage interface producing distinctive sideband components at the spectrum of the received signal. Assessment of material nonlinearity, and thus damage severity, is achieved by measuring the modulation index defined as a ratio of amplitudes of the sideband and the fundamental frequencies. Practical examples of the micro-scale nonlinear acoustic damage detection in aerospace materials are provided and damage prediction methodologies are discussed. Experimental studies suggest that VAMT is a valuable tool for continuous structural health monitoring of aging aircraft components before and after the macro-scale fracture.
AB - Assessment of structural deterioration due to in-service and environmental loads is an essential element in ensuring safety, operability and long life of civilian and military aircrafts. Even for relatively new structures early signs material deterioration can be observed at the micro-scale. Material degradation often progresses further leading to coalescence of micro-failures and formation of one or several macro-cracks. Although the onset of the macro-scale cracking can be reliably detected by modern SHM methods, there is an increasing need for inspection technologies that may allow for assessing structural damage at a wide range of material scales, i.e. from micro to macro. This contribution presents a nonlinear acoustic vibro-acoustic modulation technique (VAMT) that is sensitive to micro and macro scale material imperfections ranging from dislocations conglomerations to delaminations and cracks. VMT utilizes a combined excitation comprising of a high frequency ultrasonic wave and low frequency vibrations that interact at the damage interface producing distinctive sideband components at the spectrum of the received signal. Assessment of material nonlinearity, and thus damage severity, is achieved by measuring the modulation index defined as a ratio of amplitudes of the sideband and the fundamental frequencies. Practical examples of the micro-scale nonlinear acoustic damage detection in aerospace materials are provided and damage prediction methodologies are discussed. Experimental studies suggest that VAMT is a valuable tool for continuous structural health monitoring of aging aircraft components before and after the macro-scale fracture.
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M3 - Conference contribution
AN - SCOPUS:66749171931
SN - 1932078630
SN - 9781932078633
T3 - Proceedings of the 3rd European Workshop - Structural Health Monitoring 2006
SP - 251
EP - 258
BT - Proceedings of the 3rd European Workshop - Structural Health Monitoring 2006
T2 - 3rd European Workshop on Structural Health Monitoring 2006
Y2 - 5 July 2006 through 7 July 2006
ER -