Micromechanical properties of granite with insights into mineral interface mechanics

作者：Pengli Zhou, Cunbao Li, Heping Xie · 发表于：International Journal of Mining Science and Technology · 年份：2025 · DOI：10.1016/j.ijmst.2025.08.009 · 被引用次数：11 · 研究领域：High-pressure geophysics and materials、Diamond and Carbon-based Materials Research、Rock Mechanics and Modeling

Understanding the mechanical behavior of diagenetic mineral granules and interfaces in granite provides essential experimental references for constructing micromechanical models of granite. The micromechanical behavior of Yanshanian granite is investigated using scanning electron microscopy–energy dispersive spectroscopy (SEM-EDS) and nanoindentation tests. The results demonstrate transitional mechanical properties at mineral interfaces. The elastic modulus and hardness exhibit intermediate values between adjacent mineral phases. The higher plasticity indices at the interfaces suggest higher plastic deformation capacity of hard-phase minerals in these regions. Additionally, fracture toughness measurements of minerals and interfaces were obtained, with interfacial values ranging from 0.90 to 1.63 MPa·m 0.5 . The analysis of mechanical property relationships shows a significant positive linear correlation between rock-scale elastic modulus and fracture toughness. However, this correlation is substantially lower at the mineral scale, demonstrating a scale effect in the relationship of different mechanical properties.