Fully-coupled simulations of thermally-induced cracking in pegmatite due to microwave irradiation
Autor: | Philipp Hartlieb, Priscilla P. Nelson, Jielin Li, Shrey Arora, Rennie B. Kaunda |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
Materials science
Thin section 0211 other engineering and technologies 02 engineering and technology engineering.material 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Thermal expansion Orthoclase chemistry.chemical_compound chemistry lcsh:Engineering geology. Rock mechanics. Soil mechanics. Underground construction lcsh:TA703-712 engineering Plagioclase von Mises yield criterion Composite material Chlorite Quartz Microwave 021101 geological & geomatics engineering 0105 earth and related environmental sciences |
Zdroj: | Journal of Rock Mechanics and Geotechnical Engineering, Vol 11, Iss 2, Pp 242-250 (2019) |
ISSN: | 1674-7755 |
Popis: | Fully-coupled thermo-mechanical simulations are implemented in COMSOL Multiphysics to investigate micro-scale stress-strain variability in pegmatite specimens subjected to thermal loading using microwaves. Thermally-induced compressive and tensile stresses increase as the microwave irradiation duration increases. The dielectric constant, coefficient of expansion, and type and size of mineralogical boundary have significant impacts on the responses of the rock to microwave irradiation. The maximum principal stress of the chlorite is the smallest, indicating that the chlorite experiences the most damage under microwave irradiation, followed by the quartz. The maximum principal stress values of plagioclase and orthoclase are larger, indicating that they are likely to incur the least damage. Where quartz or chlorite is dominant, the resulting von Mises stresses are consistently higher after 120 s of microwave irradiation. The rate of generation of von Mises stresses increases most rapidly along the interface between quartz and plagioclase, and the interface between quartz and orthoclase, followed by the interface between quartz and chlorite, and finally the interface between plagioclase and orthoclase. The presented modeling approach provides a practical method to investigate stress-strain relationships within mineralogical boundaries inside a rock thin section. Keywords: Microwave irradiation, Thermo-mechanical loading, Pegmatite, Numerical modeling |
Databáze: | OpenAIRE |
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