Thermomechanical Behavior and Mesoscale Simulation of Conglomerate under Impact Loading for Geothermal Engineering
Wei Cheng, Huifeng He, Chengfu Han, Lei Chen, Liang Zhu, Yishan Lou
TL;DR
This paper studies how conglomerate rock behaves under high temperatures and impact, showing it becomes more brittle and less strong as temperature increases.
Contribution
The novel contribution is the combined experimental and mesoscale simulation analysis of conglomerate under high-temperature impact loading.
Findings
Dynamic compressive strength of conglomerate decreases by 39.5% as temperature increases from 25°C to 300°C.
Higher temperatures lead to more brittle failure and finer fragmentation, as shown by fractal dimension analysis.
Energy dissipation decreases at elevated temperatures, promoting brittle behavior and stress localization.
Abstract
To investigate the mechanical response of conglomerate under coupled high-temperature and dynamic loading conditions, impact compression tests were conducted using a ⌀50 mm Split Hopkinson Pressure Bar (SHPB) system at temperatures of 25 °C, 100 °C, 150 °C, 200 °C, 250 °C, and 300 °C. At lower temperatures, the specimens exhibit greater energy absorption and dissipation capacity, which promotes crack propagation and energy release. In contrast, at elevated temperatures, energy reflection becomes more pronounced while dissipation decreases, leading to a more brittle failure mode. Mesoscopic analysis based on finite element simulations further clarifies the influence of temperature on stress distribution and crack evolution during impact failure. The results indicate that the dynamic compressive strength of conglomerate decreases with increasing temperature, with the peak stress dropping…
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Taxonomy
TopicsRock Mechanics and Modeling · High-Velocity Impact and Material Behavior · CO2 Sequestration and Geologic Interactions