Academic Journal
Fracture toughness of schist, amphibolite, and rhyolite from the Sanford Underground Research Facility (SURF), Lead, South Dakota
| العنوان: | Fracture toughness of schist, amphibolite, and rhyolite from the Sanford Underground Research Facility (SURF), Lead, South Dakota |
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| المؤلفون: | Jahnke, Ben, Ruplinger, Casey, Bate, Charlotte E., Trzeciak, Maciej, Sone, Hiroki, Wang, Herbert F. |
| المساهمون: | U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE), Office of Technology Development, and Geothermal Technologies Office |
| المصدر: | Scientific Reports ; volume 12, issue 1 ; ISSN 2045-2322 |
| بيانات النشر: | Springer Science and Business Media LLC |
| سنة النشر: | 2022 |
| الوصف: | The Cracked Chevron Notched Brazilian Disc (CCNBD) method was selected for Mode I fracture toughness tests on Poorman schist, Yates amphibolite, and rhyolite dikes from the EGS Collab site at the SURF in Lead, South Dakota. The effects of lithology, anisotropy, and loading rate were investigated. Fracture toughness was greatest in amphibolite, with schist and rhyolite having similar toughness values ( $${K}_{amphibolite}$$ K amphibolite > $${K}_{rhyolite}$$ K rhyolite ≈ $${K}_{schist}$$ K schist ). The effects of anisotropy on fracture toughness were investigated in the foliated schist samples. Schist samples were prepared in three geometries (divider, arrester, and short transverse) which controlled how the fracture would propagate relative to foliations. The divider geometry was strongest and short transverse geometry was the weakest ( $${K}_{divider}$$ K divider > $${K}_{arrester}$$ K arrester > $${K}_{short transverse}$$ K shorttransverse ). Fracture toughness was observed to decrease with decreasing loading rate. Optical and SEM microscopy revealed that for the short transverse geometry, fractures tended to propagate along grain boundaries, whereas in arrester and divider geometries fractures tended to propagate through grains. In foliated samples, the tortuosity of the fracture observed in thin section was greater in arrester and divider geometries than in short transverse geometries. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1038/s41598-022-20031-y |
| الاتاحة: | http://dx.doi.org/10.1038/s41598-022-20031-y https://www.nature.com/articles/s41598-022-20031-y.pdf https://www.nature.com/articles/s41598-022-20031-y |
| Rights: | https://creativecommons.org/licenses/by/4.0 ; https://creativecommons.org/licenses/by/4.0 |
| رقم الانضمام: | edsbas.DA00E17D |
| قاعدة البيانات: | BASE |
| DOI: | 10.1038/s41598-022-20031-y |
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