INVESTIGADORES
PONCE ALTAMIRANO Claudio Ariel
artículos
Título:
The macroscopic elastic anisotropy in tough ceramics from the single crystal elastic behaviour
Autor/es:
M.A. CARAVACA; R.A. CASALI; C.A. PONCE
Revista:
Procedia Engineering
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2011 vol. 10 p. 2158 - 2163
ISSN:
1877-7058
Resumen:
The modern techniques for engineering analysis are based on a deep understanding of the proportional
relationship between stress and strain and the description in terms of isotropic elastic constants, in many cases, is
enough. In anisotropic materials the knowledge of the elastic constants is important for the manufacturing process
and for micro mechanical modelling behaviour of the material to develop the new composite materials.
Theoretical calculations of elastics constants and anisotropies are applied to tough ceramics ZrO2
, HfO2
and in
rutile TiO2
and SnO2
. Their dependence of the residual hydrostatic stress in the crystal are given. The microscopic
elastic anisotropy determined in this work, could be applied in the macro scale in the case the constituent grains
have a preferred orientation in the crystal lattice or the grains shape is not spherical (faceted) and it is aligned to a
common crystal axis. To cover the case where the grains are distributed at randomly, the Voigt-Reuss-Hill
polycrystalline approach is applied to obtain the average values of Young, bulk, shear modules, Poisson coefficient
and sound velocity in the transversal and longitudinal modes.
These theoretical results, could be useful in the interpretation of experimental results obtained with the method
known as diffraction elastic constant (DEC).