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Recent Milestones in Unraveling the Full-Field Structure of Dynamic Shear Cracks and Fault Ruptures in Real-Time: From Photoelasticity to Ultrahigh-Speed Digital Image Correlation

Rosakis, A. J. and Rubino, V. and Lapusta, N. (2020) Recent Milestones in Unraveling the Full-Field Structure of Dynamic Shear Cracks and Fault Ruptures in Real-Time: From Photoelasticity to Ultrahigh-Speed Digital Image Correlation. Journal of Applied Mechanics, 87 (3). Art. No. 030801. ISSN 0021-8936. https://resolver.caltech.edu/CaltechAUTHORS:20200113-161350780

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Abstract

The last few decades have seen great achievements in dynamic fracture mechanics. Yet, it was not possible to experimentally quantify the full-field behavior of dynamic fractures, until very recently. Here, we review our recent work on the full-field quantification of the temporal evolution of dynamic shear ruptures. Our newly developed approach based on digital image correlation combined with ultrahigh-speed photography has revolutionized the capabilities of measuring highly transient phenomena and enabled addressing key ques- tions of rupture dynamics. Recent milestones include the visualization of the complete displacement, particle velocity, strain, stress and strain rate fields near growing ruptures, capturing the evolution of dynamic friction during individual rupture growth, and the detailed study of rupture speed limits. For example, dynamic friction has been the big- gest unknown controlling how frictional ruptures develop but it has been impossible, until now, to measure dynamic friction during spontaneous rupture propagation and to understand its dependence on other quantities. Our recent measurements allow, by simul- taneously tracking tractions and sliding speeds on the rupturing interface, to disentangle its complex dependence on the slip, slip velocity, and on their history. In another application, we have uncovered new phenomena that could not be detected with previous methods, such as the formation of pressure shock fronts associated with “supersonic” propagation of shear ruptures in viscoelastic materials where the wave speeds are shown to depend strongly on the strain rate.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1115/1.4045715DOIArticle
ORCID:
AuthorORCID
Rosakis, A. J.0000-0003-0559-0794
Rubino, V.0000-0002-4023-8668
Lapusta, N.0000-0001-6558-0323
Additional Information:© 2020 by ASME. Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received November 1, 2019; final manuscript received December 11, 2019; published online December 14, 2019. Assoc. Editor: Yonggang Huang. Century Fracture Mechanics Summit. This study was supported by the US National Science Foundation (NSF) (Grant nos. EAR 1321655 and EAR-1651235), the US Geological Survey (USGS) (Grant No. G16AP00106), and the Southern California Earthquake Center (SCEC), contribution No. 9998. SCEC is funded by NSF Cooperative Agreement EAR-1600087 and USGS Cooperative Agreement G17AC00047.
Group:GALCIT
Funders:
Funding AgencyGrant Number
NSFEAR-1321655
NSFEAR-1651235
USGSG16AP00106
Southern California Earthquake Center (SCEC)UNSPECIFIED
NSFEAR-1600087
USGSG17AC00047
Subject Keywords:earthquake source physics, rupture dynamics, dynamic friction, supershear and supersonic ruptures, digital image correlation
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center9998
Issue or Number:3
Record Number:CaltechAUTHORS:20200113-161350780
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200113-161350780
Official Citation:Rosakis, A. J., Rubino, V., and Lapusta, N. (January 8, 2020). "Recent Milestones in Unraveling the Full-Field Structure of Dynamic Shear Cracks and Fault Ruptures in Real-Time: From Photoelasticity to Ultrahigh-Speed Digital Image Correlation." ASME. J. Appl. Mech. March 2020; 87(3): 030801. https://doi.org/10.1115/1.4045715
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100702
Collection:CaltechAUTHORS
Deposited By: Vito Rubino
Deposited On:14 Jan 2020 02:45
Last Modified:15 Jan 2020 00:26

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