Elastic Behavior of an Atomic Lattice Under Large Volumetric Strains: The Quasi-Harmonic Idealization.

Abstract

The implications of Segletes' recent equation of state are examined, when idealized to the condition defined as quasi-harmonicity. 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 quasi-harmonic idealization of Segletes' equation will approach the harmonic approximation in the limit.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1997
Accession Number
ADA326055

Entities

People

  • Steven B. Segletes

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Crystal Lattices
  • Crystal Structure
  • Dynamics
  • Engineering
  • Equations
  • Frequency
  • Geography
  • Jet Propulsion
  • Materials
  • Mechanical Engineering
  • Mechanics
  • Military Research
  • Planetary Sciences
  • Poisson Ratio
  • Three Dimensional
  • Vibrational Spectra
  • Wave Propagation

Readers

  • Computational Fluid Dynamics (CFD)
  • Fluid Dynamics.
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Space