Grain-Size Effects on Mechanical Behavior and Failure of Dense Cohesive Granular Materials

• Published in: KONA Powder and Particle Journal 2022/01/10, Vol.39, pp.193-207
• Main Authors: Poorsolhjouy, Payam, Misra, Anil
• Format: Article
• Language: English
• Subjects: brittle to ductile; Continuum modeling; Damage assessment; Deformation; Deformation effects; Density; Ductile-brittle transition; Failure; Grain size; grain sizes; Granular materials; granular micromechanics; Mathematical morphology; Mechanical analysis; Mechanical properties; Micromechanics; Morphology; Size effects; Stiffness; triaxial compression; Triaxial tests; yield; Yield stress
• ISSN: 0288-4534; 2187-5537
• DOI: 10.14356/kona.2022001

The grain sizes can significantly influence the granular mechano-morphology, and consequently, the macro-scale mechanical response. From a purely geometric viewpoint, changing grain size will affect the volumetric number density of grain-pair interactions as well as the neighborhood geometry. In addition, changing grain size can influence initial stiffness and damage behavior of grain-pair interactions. The granular micromechanics approach (GMA), which provides a paradigm for bridging the grain-scale to continuum models, has the capability of describing the grain size influence in terms of both geometric effects and grain-pair deformation/dissipation effects. Here the GMA based Cauchy-type continuum model is enhanced using simple power laws to simulate the effect of grain size upon the volumetric number density of grain-pair interactions, and the parameters governing grain-pair deformation and dissipation mechanisms. The enhanced model is applied to predict the macroscopic response of cohesive granular solids under conventional triaxial tests. The results show that decreasing grain-sizes can trigger brittle-to-ductile transition in failure. Grain size is found to affect the compression/dilatation behavior as well as the post-peak softening/hardening of granular materials. The macro-scale failure/yield stress is also found to have an inverse relationship with grain-sizes in consonance with what has been reported in the literature.