How reproducible are methods to measure the dynamic viscoelastic properties of poroelastic media?

TL;DR

This study evaluates the reproducibility of common experimental methods for measuring the dynamic elastic properties of poroelastic media, revealing significant variability and suggesting the need for improved standardization.

Contribution

It provides the first systematic assessment of reproducibility for key elastic property measurements in poroelastic media, highlighting current limitations.

Findings

Reproducibility of measurement methods is poor.

Significant variability exists across independent measurements.

Results suggest a need for improved standardization.

Abstract

There is a considerable number of research publications on the acoustical properties of porous media with an elastic frame. A simple search through the Web of ScienceTM (last accessed 21 March 2018) suggests that there are at least 819 publications which deal with the acoustics of poroelastic media. A majority of these researches require accurate knowledge of the elastic properties over a broad frequency range. However, the accuracy of the measurement of the dynamic elastic properties of poroelastic media has been a contentious issue. The novelty of this paper is that it studies the reproducibility of some popular experimental methods which are used routinely to measure the key elastic properties such as the dynamic Young's modulus, loss factor and Poisson ratio of poroelastic media. In this paper, fourteen independent sets of laboratory measurements were performed on specimens of the same porous materials. The results from these measurements suggest that the reproducibility of this type of experimental method is poor. This work can be helpful to suggest improvements which can be developed to harmonize the way the elastic properties of poroelastic media are measured worldwide.