Scholarlink

<p>The shape effect on the mechanical behavior of breakable coarse grains at the critical state remains insufficiently understood due to the complex nature of grain crushing characteristics. In this study, a novel discrete element method (DEM) framework incorporating both realistic particle shape and breakage was presented to comprehensively reveal the competing mechanism between inherent shape effect and grain crushing behavior for coarse grain assemblies. Two groups of realistic shapes, including angular and pebble grains, along with idealized spherical grains were modeled using the bonded particle method (BPM), with model parameters calibrated against experimental data. Subsequently, triaxial shear tests were conducted to investigate the macroscopic shear behaviors of granular assembly under varying confining pressures, with particular focus on the critical state. Two distinct shape effects have been identified: (1) more irregular shapes exhibit lower crushing resistance, leading to more significant shape degradation as reflected by a higher breakage index; and (2) more irregular shapes promote stronger interlocking between particles, enhancing mechanical stability. To characterize the competition of these effects, a debonding coefficient was proposed. Three influencing regimes were distinguished by two critical debonding coefficient. From regime I to regime III, the shape effect on enhancing interlocking between particles was gradually offset by the strength reduction caused by shape-induced degradation. These findings provide a new insight into the deformation mechanisms of breakable coarse grains with complex morphology.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

An insight into the competition between the shape effects and grain crushing behavior: from single grain to aggregates

  • 期刊论文

  • 发表日期：

    2026年2月25日

查看全文
  • Quanshui Huang,
  • Xuan Huang,
  • Huanfeng Qiu,
  • Haoran Jiang,
  • Bo Xu,
  • Xing Zhou

摘要

The shape effect on the mechanical behavior of breakable coarse grains at the critical state remains insufficiently understood due to the complex nature of grain crushing characteristics. In this study, a novel discrete element method (DEM) framework incorporating both realistic particle shape and breakage was presented to comprehensively reveal the competing mechanism between inherent shape effect and grain crushing behavior for coarse grain assemblies. Two groups of realistic shapes, including angular and pebble grains, along with idealized spherical grains were modeled using the bonded particle method (BPM), with model parameters calibrated against experimental data. Subsequently, triaxial shear tests were conducted to investigate the macroscopic shear behaviors of granular assembly under varying confining pressures, with particular focus on the critical state. Two distinct shape effects have been identified: (1) more irregular shapes exhibit lower crushing resistance, leading to more significant shape degradation as reflected by a higher breakage index; and (2) more irregular shapes promote stronger interlocking between particles, enhancing mechanical stability. To characterize the competition of these effects, a debonding coefficient was proposed. Three influencing regimes were distinguished by two critical debonding coefficient. From regime I to regime III, the shape effect on enhancing interlocking between particles was gradually offset by the strength reduction caused by shape-induced degradation. These findings provide a new insight into the deformation mechanisms of breakable coarse grains with complex morphology.