Inadequacy of Coulomb's friction law for particle assemblies

Details Inadequacy of Coulomb's friction law for particle assemblies Inadequacy of Coulomb's friction law for particle assemblies

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.319..203k&link_type=abstract

Nature (ISSN 0028-0836), vol. 319, Jan. 16, 1986, p. 203-205.

Computer Science

9

Coulomb Collisions, Friction, Powder (Particles), Shear Stress, Assemblies, Particle Size Distribution

Scientific paper

It has been observed that Coulomb's friction law, which is commonly used to describe frictional forces between powder particles that are being manipulated by mechanical means, is not adequate when applied to compaction of fine powders in the manufacture of ceramic articles, where friction appears to increase for smaller particles. A theory is presented, which explains the failure of Coulomb's law in the case of powders with very high surface area. The apparent increase in friction is explained by considering in detail the contact of loaded adhesive elastic spheres.

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