Lattanzi, A. and Rubino, V. and Rossi, M. and Donzelli, A. and Rosakis, A. J. and Lapusta, N. (2023) Uncertainty Analysis of Dynamic Rupture Measurements Obtained Through Ultrahigh-Speed Digital Image Correlation. Experimental Mechanics . ISSN 0014-4851. doi:10.1007/s11340-022-00932-9. (In Press) https://resolver.caltech.edu/CaltechAUTHORS:20230123-451841300.38
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Abstract
Background: The full-field behavior of dynamic shear cracks, with their highly transient features, has recently been quantified by employing Digital Image Correlation (DIC) coupled with ultrahigh-speed photography (at 1-2 million frames/sec). The use of ultrahigh-speed DIC has enabled the observation of complex structures associated with the evolution of the dynamic shear fractures under controlled laboratory conditions, providing a detailed description of their distinctive full-field kinematic features. This has allowed to identify, for instance, the spatiotemporal characteristics of sub-Rayleigh and intersonic shear ruptures, and to measure the evolution of dynamic friction during rupture propagation of frictional shear ruptures. Objective: Capturing such highly transient phenomena represents a challenging metrological process influenced by both ultra-fast imaging procedures and DIC analysis parameters. However, the effect of these parameters on the quantification of the rupture features has not been assessed yet. Here, a simulated experiment framework is presented and employed to evaluate the uncertainties associated with ultrahigh-speed DIC measurements. Methods: Finite element simulations replicate laboratory experiments of dynamic ruptures spontaneously propagating along frictional interfaces. Experimental images of the specimen acquired with an ultrahigh-speed camera are numerically deformed by the displacement fields obtained from the numerical simulations and are analyzed using the same DIC analysis procedure as in the laboratory experiments. Results: The displacement, particle velocity, and strain fields obtained from the DIC analysis are compared with the ground-truth fields of the numerical simulations, correlating the measurement resolution with the physical length scale of the propagating Mode II rupture. In addition, the full-field data are employed to estimate the capability of the ultrahigh-speed DIC setup to infer the dynamic friction evolution. Conclusions: This methodology allows us to quantify the accuracy of the ultrahigh-speed DIC measurements in resolving the complex spatiotemporal structures of dynamic shear ruptures, focusing on the impact of the key correlation parameters.
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Additional Information: | V.R. and A.J.R. would like to acknowledge the support of NSF (Grant EAR-1651235 and EAR-1651235), the US Geological Survey (USGS) (Grant G20AP00037), the NSF-IUCRC at California Institute of Technology-Center for Geomechanics and Mitigation of Geohazards (GMG), and the Southern California Earthquake Center (SCEC). SCEC is funded by NSF Cooperative Agreement EAR-1033462 and USGS Cooperative Agreement G12AC20038. V.R. thanks Fabrice Pierron for insightful discussions on the uncertainty quantification of DIC measurements. | ||||||||||||||
Group: | GALCIT, Division of Geological and Planetary Sciences, Seismological Laboratory, Center for Geomechanics and Mitigation of Geohazards (GMG) | ||||||||||||||
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DOI: | 10.1007/s11340-022-00932-9 | ||||||||||||||
Record Number: | CaltechAUTHORS:20230123-451841300.38 | ||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20230123-451841300.38 | ||||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||
ID Code: | 118902 | ||||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||||
Deposited By: | Research Services Depository | ||||||||||||||
Deposited On: | 16 Feb 2023 17:33 | ||||||||||||||
Last Modified: | 16 Feb 2023 17:33 |
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