Accession Number : ADA499496


Title :   Finite Deformation by Elasticity, Slip, and Twinning: Atomistic Considerations, Continuum Modeling, and Application to Ceramic Crystals


Descriptive Note : Conference paper


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE


Personal Author(s) : Clayton, John D


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a499496.pdf


Report Date : Mar 2009


Pagination or Media Count : 10


Abstract : A continuum theory is developed for modeling elasticity, plasticity, and twinning in single crystals of arbitrary anisotropy, subjected to arbitrarily large deformations. Concepts from discrete lattice models are considered for estimating resistances to inelastic shear. Nonlinear thermoelastic calculations are used in conjunction with experimental shock physics observations to provide estimates for resistances to slip, twinning, and shear fracture on preferred planes in alumina single crystals (i.e., rhomobohedral corundum or sapphire).


Descriptors :   *SINGLE CRYSTALS , *TWINNING(CRYSTALLOGRAPHY) , *PLASTIC PROPERTIES , THEORY , CERAMIC MATERIALS , THERMOELASTICITY , ALUMINUM OXIDES , CRYSTAL DEFECTS , CORUNDUM , SHEAR MODULUS , DEFORMATION , SYMPOSIA , SAPPHIRE


Subject Categories : Mechanics
      Crystallography


Distribution Statement : APPROVED FOR PUBLIC RELEASE