Numerical simulation of microwave-induced cracking and melting of granite based on mineral microscopic models

Xiaoli Su; Diyuan Li; Junjie Zhao; Mimi Wang; Xing Su; Aohui Zhou

doi:10.1007/s12613-023-2821-4

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Xiaoli Su, Diyuan Li, Junjie Zhao, Mimi Wang, Xing Su, and Aohui Zhou, Numerical simulation of microwave-induced cracking and melting of granite based on mineral microscopic models, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2821-4

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Xiaoli Su, Diyuan Li, Junjie Zhao, Mimi Wang, Xing Su, and Aohui Zhou, Numerical simulation of microwave-induced cracking and melting of granite based on mineral microscopic models, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2821-4

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Research Article

Numerical simulation of microwave-induced cracking and melting of granite based on mineral microscopic models

+ Author Affiliations

Corresponding author:
Diyuan Li E-mail: diyuan.li@csu.edu.cn
Received: 29 July 2023; Revised: 22 December 2023; Accepted: 27 December 2023; Available online: 29 December 2023

Abstract

Abstract

This study introduces a coupled electromagnetic–thermal–mechanical model to reveal the mechanisms of microcracking and mineral melting of polymineralic rocks under microwave radiation. Experimental tests validate the rationality of the proposed model. Embedding microscopic mineral sections into the granite model for simulation shows that uneven temperature gradients create distinct molten, porous, and nonmolten zones on the fracture surface. Moreover, the varying thermal expansion coefficients and Young’s moduli among the minerals induce significant thermal stress at the mineral boundaries. Quartz and biotite with higher thermal expansion coefficients are subjected to compression, whereas plagioclase with smaller coefficients experiences tensile stress. In the molten zone, quartz undergoes transgranular cracking due to the α–β phase transition. The local high temperatures also induce melting phase transitions in biotite and feldspar. This numerical study provides new insights into the distribution of thermal stress and mineral phase changes in rocks under microwave irradiation.
- microwave;
- numerical modeling;
- microcracking;
- phase change;
- granite

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