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Problems with ultrasonic measurements of shear modules of structured media

Paper ID Volume ID Publish Year Pages File Format Full-Text
2205 103 2007 11 PDF Available
Title
Problems with ultrasonic measurements of shear modules of structured media
Abstract

The elastic constants of linearly elastic, isotropic or anisotropic bone material are required for many numerical simulations. These constants are often measured ultrasonically, but this can lead to mistakes, especially if shear modules of spongiosa are considered. The reason is that spongiosa is a structure composed of trabeculae, each of which acts as a kind of beam which allows longitudinal, shear and also bending waves to propagate; the bending waves are as fast as the longitudinal waves and are indistinguishable from the shear waves. Furthermore, mistakes in measuring Young’s modulus cannot be avoided in every case. Several numerical simulations of wave propagations in homogeneous media, and especially in periodically and irregularly structured media, were carried out via the application of explicit finite element codes. Results showing the above-mentioned effects are presented and discussed. These can help to explain in detail why mistakes may occur during ultrasonic measurements.

Keywords
Cancellous bone; Shear modulus; Young’s modulus; Ultrasonic technique
First Page Preview
Problems with ultrasonic measurements of shear modules of structured media
Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 3, Issue 5, September 2007, Pages 723–733
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering