Explicit Formulae Showing the Effects of Texture on Acoustoelastic Coefficients

It is well known that crystallographic texture not only modifies the elastic constants of polycrystalline aggregates at (unstressed) natural states but also affects their acoustoelastic coefficients when the aggregates are stressed. While exact knowledge about the effects of texture on acoustoelastic coefficients has hitherto remained wanting, such effects are usually assumed to be negligible and are ignored in practical applications of acoustoelasticity (cf. [1] for example). Concerning this common practice, Thompson et al. [2] have urged caution: Care must be taken when [this] assumption is made since the influence of texture on acoustoelastic constants is stronger than its influence on elastic moduli or velocities

Serial Studies about Biological Changes of Human Periodontal Ligament Cells Induced by Mechanical Stress

Recent advances in acoustic microscopy and laser ultrasonics offer surface acoustic waves as a promising means for surface inspection, e.g., for nondestructive evaluation of surface stress. To use Rayleigh waves for measurement of stress in structural metals, the appropriate acoustoelastic coefficients must first be ascertained. For aluminum alloys, however, there has been a lingering problem on the values of Rayleigh-wave acoustoelastic coefficients

Two Micromechanical Models in Acoustoelasticity: a Comparative Study

Herein we derive, under the micromechanical model we proposed earlier, Man and Paroni [14], a complete set of formulae for the twelve material constants in the acoustoelastic constitutive equation for orthorhombic aggregates of cubic crystallites. We present also a second model and compare its predictions on the material constants with those of the first model. Both these models lead to constitutive equations which are indifferent to rotation of reference placement. This allows us to appeal to a new representation theorem (Paroni and Man [15]), which greatly facilitates our derivation of the formulae for the material constants. The second model introduced in this paper is intimately related to some previous averaging theories in the literature. We explain why and in what sense our second model could be taken as a generalization of its predecessors