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Author Giurgiutiu, Victor ♦ Yu, Lingyu ♦ Iii, James R. Kendall ♦ Jenkins, Christopher
Source CiteSeerX
Content type Text
File Format PDF
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Description Piezoelectric-wafer active sensors are small, inexpensive, noninvasive, elastic wave transmitters/receivers that can be easily affixed to a structure. As wide-band nonresonant devices, piezoelectric-wafer active sensors can selectively tune in various Lamb-wave modes traveling in a thin-wall structure. This paper presents results obtained using a linear piezoelectric-wafer phased array to in situ image crack growth during a simulated structural health monitoring test on a large 2024-T3 aluminumplate. During the test, in situ readings of the piezoelectric-wafer phased array were taken in a round-robin fashion while the testing machine was running. Additional hardware was incorporated to prefilter the received signals before digitization to obtain usable readings. The received signals were postprocessed with the embedded ultrasonic structural radar phased-array algorithm and a direct imaging of the crack in the test platewas obtained.The imaging resultswere comparedwith physicalmeasurements of the crack size using a digital camera. Good consistency was observed. The results of this investigation could be used to predict the gradual growth of a crack during structural health monitoring. Nomenclature a = half-length of the piezoelectric-wafer transducer; also, crack length c = wave speed
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article
Publisher Date 2006-01-01
Publisher Institution 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics & Materials Conference and 14th AIAA/ASME/AHS Adaptive Structures Conference, Newport, RI, 1-5, paper