A discrete numerical analysis of the yield and damage properties associated with a cohesive granular system composed of ductile particles is hereby presented. Such a modelling approach aims at better understanding damage mechanisms which are often encountered during the powder compaction process, widely used in the metallurgical and pharmaceutical fields. The analysis was based on the micromechanical modelling of an idealised granular system in the framework of the multi-particle finite element method, in which particle deformation was fully taken into account. An adhesive interaction law, presented in Audry et al. (2024), was used in the purpose of estimating the averaged mechanical properties associated with the modelled elementary volume. The focus was put on tensile and highly deviatoric loadings, which are usually related to the failure of powder compacts. The specific contact area developed through inter-particles contacts was used as an indicator of the mechanical strength of the elementary volume. Threshold surfaces corresponding to yielding and contact decohesion mechanisms were plotted in the stress space.

中文翻译：

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剪切和拉伸载荷下压实延性粉末的介观力学


在此提出了与由延性颗粒组成的粘性颗粒系统相关的屈服和损伤特性的离散数值分析。这种建模方法旨在更好地理解粉末压制过程中经常遇到的损伤机制，广泛应用于冶金和制药领域。该分析基于多粒子有限元方法框架中理想化颗粒系统的微观力学建模，其中充分考虑了颗粒变形。 Audry 等人提出了粘合相互作用定律。 (2024)，用于估计与建模单元体积相关的平均机械性能。重点放在拉伸和高偏载荷上，这些载荷通常与粉末压块的失效有关。通过颗粒间接触形成的比接触面积被用作单元体积机械强度的指标。在应力空间中绘制了与屈服和接触脱聚机制相对应的阈值表面。