Abstract
A shear band is a heterogeneous, narrow seam within a solid material whose formation is caused by intense localized shearing when a sufficiently large amount of deformation occurs. If that deformation occurs at a sufficiently rapid rate, with operative friction, then co-located ephemeral heating will occur in the shear band. In this study, shear bands were produced from dynamic shear-induced compaction of a granular form of crystalline α-quartz (SiO2). The produced shear bands were approximately 25-µm thick and were examined with scanning electron microscopy/electron backscatter diffraction, transmission electron microscopy, Raman spectroscopy, and nanoindentation. They were found to contain a mixture of vitreous silica and small-sized crystallites. This finding is significant because the presence of the vitreous silica within the shear band is a postmortem indicator that the localized temperature had reached or exceeded the melting temperature (∼1723°C) of crystalline SiO2 during the rapid shear and compaction and then sufficiently rapid cooling quenched in that vitreous state.
| Original language | English |
|---|---|
| Article number | e16704 |
| Journal | International Journal of Applied Glass Science |
| Volume | 16 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jul 2025 |
Funding
The authors thank ORNL's B. Cowell for financial support and technical influences, Johns Hopkins University's B. Kuwik for providing the test material, the University of Denver's D. New and G. Ogg and the University of Tennessee's R. Parten and Alfred University's H. Lee and W. Carty (Emeritus) for their supporting activities and inputs, Applied Research Associate's D. Grady for their review, and ORNL's B.\u00A0Long for metallography support and T. Lach, B.\u00A0Lamm, and J. Hemrick for their technical reviews of this manuscript and inputs. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). The authors thank ORNL's B. Cowell for financial support and technical influences, Johns Hopkins University's B. Kuwik for providing the test material, the University of Denver's D. New and G. Ogg and the University of Tennessee's R. Parten and Alfred University's H. Lee and W. Carty (Emeritus) for their supporting activities and inputs, Applied Research Associate's D. Grady for their review, and ORNL's B. Long for metallography support and T. Lach, B. Lamm, and J. Hemrick for their technical reviews of this manuscript and inputs. This manuscript has been authored by UT\u2010Battelle, LLC, under contract DE\u2010AC05\u201000OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid\u2010up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe\u2010public\u2010access\u2010plan ).
Keywords
- dynamic compaction
- shear band
- transmission electron microscopy
- vitreous silica
- α-quartz