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<p>To investigate the deformation and fracture response mechanisms of quasi-brittle materials at the mesoscopic scale, nanoindentation tests with different loading depths were conducted on three typical quasi-brittle materials: cement concrete, chalcopyrite crystal, and silica glass. Their mechanical properties, energy evolution characteristics, and indentation morphologies were systematically analyzed. The results indicate that cement concrete exhibits damage–plasticity coupling characteristics, with the highest fracture energy efficiency (22.87%). This rate peaks at shallow indentation depths and then slightly decreases before stabilizing. Chalcopyrite is a plasticity-dominated material, with an average fracture energy efficiency of 7.07%, which continuously decreases with increasing loading depth; conversely, its plastic energy efficiency is the highest (70.86%) and continuously increases with loading depth. Silica glass is an elasticity-dominated material, exhibiting the highest elastic energy efficiency (66.22%) and the lowest fracture energy efficiency (2.72%), although the latter shows a slight increase with loading depth. This study provides a theoretical basis for optimizing comminution strategies for materials with different characteristics in mineral processing.</p>

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Study on Energy Evolution Mechanism of Typical Quasi-brittle Materials by Nanoindentation Tests

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Xingjian Cao,
  • Yongtai Pan,
  • Zhengpeng Wu,
  • Fangxi Yin

摘要

To investigate the deformation and fracture response mechanisms of quasi-brittle materials at the mesoscopic scale, nanoindentation tests with different loading depths were conducted on three typical quasi-brittle materials: cement concrete, chalcopyrite crystal, and silica glass. Their mechanical properties, energy evolution characteristics, and indentation morphologies were systematically analyzed. The results indicate that cement concrete exhibits damage–plasticity coupling characteristics, with the highest fracture energy efficiency (22.87%). This rate peaks at shallow indentation depths and then slightly decreases before stabilizing. Chalcopyrite is a plasticity-dominated material, with an average fracture energy efficiency of 7.07%, which continuously decreases with increasing loading depth; conversely, its plastic energy efficiency is the highest (70.86%) and continuously increases with loading depth. Silica glass is an elasticity-dominated material, exhibiting the highest elastic energy efficiency (66.22%) and the lowest fracture energy efficiency (2.72%), although the latter shows a slight increase with loading depth. This study provides a theoretical basis for optimizing comminution strategies for materials with different characteristics in mineral processing.