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Thermal Response and Mechanical Degradation of Typical Rock-Forming Minerals Under Laser Irradiation
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DOI：10.1007/s00603-026-05860-x.png)
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Abstract
En 中文
Laser assisted rock fragmentation has demonstrated significant potential for applications in rock processing, mining, and geotechnical engineering. The rock is fractured once the thermal stress arising from the temperature gradient exceeds its ultimate strength when laser irradiates. It is essential to investigate the interactions between lasers and rock-forming minerals to understand the impact of laser irradiation on rock thermo-mechanical properties. The evolution of thermal response is investigated by selecting the rock-forming minerals in this study. The surface morphology and mechanical properties of the tested samples were characterized using a high-resolution industrial microscope and a rock testing machine. The laser thermal response rate (β) is proposed as a classification index of mineral sensitivity, and verified by the change of uniaxial compressive strength. The results indicate that significant differences are observed in the thermal sensitivity of rock-forming minerals to laser irradiation. Magnetite exhibits the highest laser responsiveness. The minerals are categorized into laser-sensitive, laser-neutral, and laser-insensitive types according to the laser thermal response rate. Furthermore, the uniaxial compressive strength of magnetite and the elastic modulus of pyrite show the greatest reductions, reaching 46.44% and 55.33% after irradiation. Distinct ablation pits and glassy glaze form on the surface of laser-sensitive minerals. Understanding the thermal responses of individual minerals can help interpret heterogeneous thermal damage and crack initiation in polymineralic rocks under laser irradiation. The findings provide important insights into predicting the thermal damage to rocks subjected to laser irradiation.
Keywords:
Rock-forming minerals
Laser irradiation
Thermal response
Crack propagation
Mechanical degradation
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