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Full-field Ultrahigh-speed Quantification of Dynamic Shear Ruptures Using Digital Image Correlation

Rubino, V. and Rosakis, A. J. and Lapusta, N. (2019) Full-field Ultrahigh-speed Quantification of Dynamic Shear Ruptures Using Digital Image Correlation. Experimental Mechanics, 59 (5). pp. 551-582. ISSN 0014-4851. https://resolver.caltech.edu/CaltechAUTHORS:20190905-102805142

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Abstract

Producing dynamic ruptures in the laboratory allows us to study fundamental characteristics of interface dynamics. Our laboratory earthquake experimental setup has been successfully used to reproduce a number of dynamic rupture phenomena, including supershear transition, bimaterial effect, and pulse-like rupture propagation. However, previous diagnostics, based on photoelasticity and laser velocimeters, were not able to quantify the full-field behavior of dynamic ruptures and, as a consequence, many key rupture features remained obscure. Here we report on our dynamic full-field measurements of displacement, velocities, strains and strain rates associated with the spontaneous propagation of shear ruptures in the laboratory earthquake setup. These measurements are obtained by combining ultrahigh-speed photography with the digital image correlation (DIC) method, enhanced to capture displacement discontinuities. Images of dynamic shear ruptures are taken at 1-2 million frames/s over several sizes of the field of view and analyzed with DIC to produce a sequence of evolving full-field maps. The imaging area size is selected to either capture the rupture features in the far field or to focus on near-field structures, at an enhanced spatial resolution. Simultaneous velocimeter measurements on selected experiments verify the accuracy of the DIC measurements. Owing to the increased ability of our measurements to resolve the characteristic field structures of shear ruptures, we have recently been able to observe rupture dynamics at an unprecedented level of detail, including the formation of pressure and shear shock fronts in viscoelastic materials and the evolution of dynamic friction.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/s11340-019-00501-7DOIArticle
https://rdcu.be/bQm9XPublisherFree ReadCube access
ORCID:
AuthorORCID
Rubino, V.0000-0002-4023-8668
Rosakis, A. J.0000-0003-0559-0794
Lapusta, N.0000-0001-6558-0323
Additional Information:© 2019 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Received: 31 December 2018; Accepted: 14 March 2019; Published online: 18 April 2019. This study was supported by the US National Science Foundation (NSF) (grant EAR 1321655 and EAR-1651235), and the US Geological Survey (USGS) (grant G16AP00106), and the Southern California Earthquake Center (SCEC), contribution No. 6276. SCEC is funded by NSF Cooperative Agreement EAR-1033462 and USGS Cooperative Agreement G12 AC20038. We gratefully acknowledge Dr. Hubert Schreier for developing Vic-2D software to treat interfaces with discontinuities.
Group:GALCIT
Funders:
Funding AgencyGrant Number
NSFEAR-1321655
NSFEAR-1651235
USGSG16AP00106
Southern California Earthquake Center (SCEC)UNSPECIFIED
NSFEAR-1033462
USGSG12 AC20038
Subject Keywords:Dynamic shear rupture; Ultrahigh-speed photography; Digital image correlation; Full-field imaging; Earthquake source mechanics
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center6276
Issue or Number:5
Record Number:CaltechAUTHORS:20190905-102805142
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190905-102805142
Official Citation:Rubino, V., Rosakis, A.J. & Lapusta, N. Exp Mech (2019) 59: 551. https://doi.org/10.1007/s11340-019-00501-7
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98430
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Sep 2019 19:27
Last Modified:03 Oct 2019 21:41

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