
Accession Number : ADA326055
Title : Elastic Behavior of an Atomic Lattice Under Large Volumetric Strains: The QuasiHarmonic Idealization.
Descriptive Note : Final rept. JanMar 97,
Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
Personal Author(s) : Segletes, Steven B.
PDF Url : ADA326055
Report Date : MAY 1997
Pagination or Media Count : 58
Abstract : The implications of Segletes' recent equation of state are examined, when idealized to the condition defined as quasiharmonicity. Results indicate that at large volumetric strains, a proportionality no longer holds, in general, between the volumetric and vibrational stiffnesses. The governing relation between these two stiffnesses is presented and is a function of the characteristic frequency of the lattice, alternately expressed in terms of the lattice spacing. It is further shown that the quasiharmonic idealization of Segletes' equation will approach the harmonic approximation in the limit.
Descriptors : *MOLECULAR VIBRATION, *QUANTUM THEORY, *HARMONICS, *ELASTIC PROPERTIES, APPROXIMATION(MATHEMATICS), EQUATIONS OF STATE, POISSON RATIO, SECONDARY WAVES, ANHARMONIC OSCILLATORS.
Subject Categories : Quantum Theory and Relativity
Distribution Statement : APPROVED FOR PUBLIC RELEASE