This paper aims to give a micromechanical investigation into the progressive size reduction mechanism and its effects on macro responses of granular assemblies during confined compression tests. A series of numerical studies based on the cohesive zone model are presented, incorporating internal deformation and fragmentation behaviors, and the variations of feed profiles are considered. Simulation results reasonably reproduce experimental observations in terms of macro compression responses and typical particle breakage modes. A scaling method is proposed for considering the contributions of fine products. With this method, the fragment size distribution is refined and compare favorably with physical results. The breakage degree is found to be dependent on input energy, regardless of variations of feed profiles including material heterogeneity, gradations, or friction conditions. Furthermore, a quantitative micro-analysis of normalized and cumulative normal contact force distribution, as well as contact orientation distribution is presented in this study, demonstrating the different roles of fragmentation in micro-mechanical response of particle assemblies owing to different materials or boundary friction effects.

本文旨在对渐进式尺寸减小机制及其对密闭压缩测试期间颗粒组件的宏观响应的影响进行微机械研究。提出了一系列基于内聚区模型的数值研究，结合了内部变形和破碎行为，并考虑了进料轮廓的变化。模拟结果从宏观压缩响应和典型的颗粒破碎模式方面合理地再现了实验观察结果。提出了一种缩放方法来考虑精细产品的贡献。使用此方法，可以改进片段大小分布，并与物理结果相比具有优势。发现破损程度取决于输入能量，而与进料曲线的变化（包括物料异质性）无关，渐变或摩擦条件。此外，本研究对归一化和累积的法向接触力分布以及接触方向分布进行了定量的微观分析，证明了由于不同的材料或边界摩擦效应，碎裂在颗粒组件的微机械响应中的不同作用。 。