Elastic-plastic crystal mechanics for low symmetry crystals

S. E. Schoenfeld, Said Ahzi, R. J. Asaro

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

A method of averaging the elastic-viscoplastic aggregate behavior of low symmetry materials is developed. The single crystal constitutive model includes both elasticity and rate dependent crystallographic slip. The constraint conditions imposed on the local deformations are discussed and developed in a form that allows elastic deformation without crystallographic slip in the constrained directions. The interaction law between the macroscopic and local deformations is achieved by a modified Taylor type model in which macroscopic equilibrium and compatibility are maintained, but local compatibility is not considered. Deformations in the constrained directions are posed as Lagrange multipliers rigorously enforcing a minimum work rate throughout the aggregate. The constitutive model is used to predict deformation response and texture evolution in a broad class of low symmetry materials lacking the five independent slip systems required to accommodate a general deformation. The predictions are compared to experimental data for the various materials. By including elasticity into the new model, predictive capabilities are now expanded to include a broad range of phenomena critical to the processing of such low symmetry crystals (i.e. yield surfaces, residual stresses, etc.).

Original languageEnglish
Pages (from-to)415-446
Number of pages32
JournalJournal of the Mechanics and Physics of Solids
Volume43
Issue number3
DOIs
Publication statusPublished - 1995
Externally publishedYes

Fingerprint

Crystal symmetry
Mechanics
plastics
Plastics
Crystals
symmetry
slip
crystals
Constitutive models
compatibility
Elasticity
elastic properties
Lagrange multipliers
elastic deformation
Elastic deformation
residual stress
Residual stresses
textures
Textures
Single crystals

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

Elastic-plastic crystal mechanics for low symmetry crystals. / Schoenfeld, S. E.; Ahzi, Said; Asaro, R. J.

In: Journal of the Mechanics and Physics of Solids, Vol. 43, No. 3, 1995, p. 415-446.

Research output: Contribution to journalArticle

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