Akademik Veri Yönetim Sistemi
Powder Technology, cilt.480, 2026 (SCI-Expanded, Scopus)
This study investigates the influence of particle geometry on shear behavior and contact-network organization in granular assemblies using a discrete element method (DEM) framework benchmarked against a Jenike-type direct shear reference. A controlled family of twenty idealized particle geometries was analyzed under comparable numerical and packing conditions. Particle geometry was characterized using a shape factor (SF), primarily associated with overall geometric deviation, and an angularity factor (AF), primarily associated with local angularity characteristics. The peak shear stress ratio and the corresponding average mechanical coordination number at peak shear were adopted as representative macro- and micro-scale response indicators, respectively. The results show that particle geometry systematically influences both the mobilized shear response and the organization of the load-bearing contact network. Increasing geometric irregularity generally enhances shear resistance and contact density up to intermediate descriptor levels, whereas excessive angularity leads to less stable contact configurations and reduced peak responses. Since the responses remain affected by normal stress even after conventional stress normalization, a stress-normalized comparative framework was employed to isolate geometry-dependent trends. Additional contact-network analyses indicate that particle geometry affects not only the density of mechanically active contacts but also their spatial organization and directional anisotropy during shearing. Within the adopted idealized DEM particle family, the study provides a comparative assessment of shape-controlled shear behavior and contact network evolution in granular assemblies.