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- W3090598840 abstract "The differential evolution indicators, recently introduced for imaging mechanical evolution in highly scattering solids, is examined in a laboratory setting with the focus on spatiotemporal tracking of an advancing damage zone in an elastic specimen. To this end, a prismatic slab of charcoal granite is quasi-statically fractured in the three-point-bending (3PB) configuration, while ultrasonic shear waves are periodically generated in the sample at certain time steps $t_kappa$, $kappa = circ, 1, 2, ..., 4$. The interaction of probing waves with the propagating damage give rise to transient velocity responses measured on the plate's boundary by a 3D scanning laser Doppler vibrometer. Thus obtained sensory data are then carefully processed to retrieve the associated spectra of scattered displacement fields $v^kappa$ at every $t_kappa$. On deploying consecutive pairs of multi-frequency data $(v^kappa, v^{kappa+1})$, the differential indicators are computed exposing the progress of 3PB-induced damage in the specimen. Verified with in-situ observations, each indicator map successfully reconstructs (a) the support of newborn fractures, and (b) the loci of discontinuities in the process zone that undergo interfacial evolution in the designated timeframe $[t_kappa ,,, t_{kappa+1}]$. Further, it is shown that the evolution indicators help better understand the damage mechanism e.g., by shining light on the fragmented nature of induced cracks and their coalescence. For completeness, data inversion via reduced and partial-aperture data is investigated, including the one-sided reconstruction." @default.
- W3090598840 created "2020-10-08" @default.
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- W3090598840 date "2021-12-01" @default.
- W3090598840 modified "2023-10-14" @default.
- W3090598840 title "Experimental validation of differential evolution indicators for ultrasonic imaging in unknown backgrounds" @default.
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- W3090598840 doi "https://doi.org/10.1016/j.ymssp.2021.108029" @default.
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