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Modeling dynamic acousto-elastic testing experiments: validation and perspectives.

A S Gliozzi¹, M Scalerandi¹

¹Department of Applied Science and Technology, Institute of Condensed Matter Physics and Complex Systems, Politecnico di Torino, C.so Duca degli Abruzzi 24, Torino, Italy.

The Journal of the Acoustical Society of America

|October 18, 2014

Summary

This summary is machine-generated.

Nonlinear material responses to pressure are sensitive to confining stress. A hysteretic elastic model explains experimental observations in granular media, predicting memory and nonlinear effects similar to rocks.

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Area of Science:

Solid Mechanics
Materials Science
Geophysics

Background:

Micro-inhomogeneities in materials lead to nonlinear mechanical responses.
These nonlinearities are significantly influenced by confining pressure.
Dynamic acoustoelastic testing measures elastic modulus changes under dynamic pressure variations.

Purpose of the Study:

To explain the nonlinear mechanical response of consolidated granular media.
To model hysteretic behavior and memory effects observed in these materials.
To compare model predictions with experimental data from rocks.

Main Methods:

Utilizing a Preisach-Mayergoyz space based hysteretic multi-state elastic model.
Applying dynamic acoustoelastic testing to measure instantaneous elastic modulus variations.
Analyzing consolidated granular media under varying confining pressures.

Main Results:

The proposed model successfully explains experimental observations in granular media.
The model predicts memory and nonlinear effects.
Predicted effects are comparable to those measured in rock samples.

Conclusions:

Hysteretic multi-state elastic models can accurately describe nonlinear material behavior.
Confining pressure plays a crucial role in the mechanical response of inhomogeneous materials.
This modeling approach offers insights into the behavior of granular media and rocks.