ATOMISTIC EXPRESSION OF HARDNESS,
Abstract
Hardness of nonmetallic solids, define as resistance against structure break-down, has been re-examined for eighty-eight solids of twenty-two different structures. The validity of the previously proposed volumetric cohesive energy, U/V, as a direct measure of hardness, has been more fully substantiated by additional data. The essential subdivision of solids into hard core and soft core could be more clearly defined. A formula is proposed which expresses hardness in terms of physical constants and measurable physical parameters only. The formula shows hardness to be directly proportional to the force constants, a structure factor and the effective valency but inversely proportional to the interatomic distance. This formulation has a direct bearing on problems, such as hardness anisotropy and solid solution hardness. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1963
- Accession Number
- AD0430069
Entities
People
- J. N. Plendl
- P. J. Gielisse
Organizations
- Air Force Cambridge Research Laboratories