https://researchportalplus.anu.edu.au/en/publications/onset-of-mechanical-stability-in-random-packings-of-frictional-sp/
Onset of mechanical stability in random packings of frictional spheres - The Australian National...
random packings
https://www.ph.ed.ac.uk/events/2017/75993-equation-of-state-for-random-sphere-packings-with-arbitrary-adhesion-and-friction
Equation of state for random sphere packings with arbitrary adhesion and friction
We systematically generate a large set of random micro-particle packings over a wide range of adhesion and friction by means of adhesive contact dynamics...
equation of state