The relaxation of a double-well energy

Research output: Contribution to journalArticle

Abstract

This paper studies coherent, energy-minimizing mixtures of two linearly elastic phases with identical elastic moduli. We derive a formula for the "relaxed" or "macroscopic" energy of the system, by identifying microstructures that minimize the total energy when the volume fractions and the average strain are fixed. If the stress-free strains of the two phases are incompatible then the relaxed energy is nonconvex, with "double-well structure". An optimal microstructure always exists within the class of layered mixtures. The optimal microstructure is generally not unique, however; we show how to construct a large family of optimal, sequentially laminated microstructures in many circumstances. Our analysis provides a link between the work of Khachaturyan and Roitburd in the metallurgical literature and that of Ball, James, Pipkin, Lurie, and Cherkaev in the recent mathematical literature. We close by explaining why the corresponding problem for three or more phases is fundamentally more difficult.

Original languageEnglish (US)
Pages (from-to)193-236
Number of pages44
JournalContinuum Mechanics and Thermodynamics
Volume3
Issue number3
DOIs
StatePublished - Sep 1991

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microstructure
Microstructure
energy
elastic modulus
balls
Volume fraction
modulus of elasticity
Elastic moduli

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Mechanics of Materials
  • Computational Mechanics
  • Engineering (miscellaneous)
  • Earth and Planetary Sciences (miscellaneous)
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

Cite this

The relaxation of a double-well energy. / Kohn, Robert.

In: Continuum Mechanics and Thermodynamics, Vol. 3, No. 3, 09.1991, p. 193-236.

Research output: Contribution to journalArticle

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