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Relation of Single‐Crystal Elastic Constants to Polycrystalline Isotropic Elastic Moduli of MgO
Author(s) -
CHUNG DAEHYUN,
SWICA JOSEPH J.,
CRANDALL WILLIAM B.
Publication year - 1963
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1963.tb11775.x
Subject(s) - crystallite , isotropy , materials science , elastic modulus , shear modulus , single crystal , periclase , moduli , condensed matter physics , young's modulus , crystal (programming language) , modulus , composite material , crystallography , optics , chemistry , metallurgy , physics , programming language , magnesium , quantum mechanics , computer science
The three elastic compliance coefficients of synthetic periclase were determined in the kilocycles per second frequency range by a resonance method. Polycrystalline elastic moduli on dense‐formed MgO were measured. The calculated isotropic elastic moduli for polycrystalline MgO obtained from the single‐crystal constants are in good agreement with experimental values measured on the dense MgO at the theoretical density point. The measured Young's modulus and the shear modulus of polycrystalline MgO are found to be 30.50 and 12.90 × 10 11 dynes per cm 2 respectively. The results of the present investigation are compared with the earlier work in the megacycles per second frequency range. A theoretical analysis is made to establish the validity of the present values. Schemes of averaging the single crystalline elastic constants for polycrystalline behavior are reviewed for crystals of cubic symmetry.