scholarly journals Wave Dispersion and Attenuation on Human Femur Tissue

Sensors ◽  
2014 ◽  
Vol 14 (8) ◽  
pp. 15067-15083 ◽  
Author(s):  
Maria Strantza ◽  
Olivia Louis ◽  
Demosthenes Polyzos ◽  
Frans Boulpaep ◽  
Danny van Hemelrijck ◽  
...  
Keyword(s):  
Wave Dispersion ◽  
Human Femur ◽  
Dispersion And Attenuation

Nonlocal Homogenization Model for Wave Dispersion and Attenuation in Elastic and Viscoelastic Periodic Layered Media

2017 ◽  
Vol 84 (3) ◽  
Author(s):  
Ruize Hu ◽  
Caglar Oskay
Keyword(s):  
Heterogeneous Media ◽  
Spatial Scales ◽  
Gradient Elasticity ◽  
Layered Media ◽  
Wave Dispersion ◽  
Momentum Balance ◽  
Eighth Order ◽  
Homogenization Model ◽  
Dispersion And Attenuation ◽  
Periodic Layered Media

This manuscript presents a new nonlocal homogenization model (NHM) for wave dispersion and attenuation in elastic and viscoelastic periodic layered media. Homogenization with multiple spatial scales based on asymptotic expansions of up to eighth order is employed to formulate the proposed nonlocal homogenization model. A momentum balance equation, nonlocal in both space and time, is formulated consistent with the gradient elasticity theory. A key contribution in this regard is that all model coefficients including high-order length-scale parameters are derived directly from microstructural material properties and geometry. The capability of the proposed model in capturing the characteristics of wave propagation in heterogeneous media is demonstrated in multiphase elastic and viscoelastic materials. The nonlocal homogenization model is shown to accurately predict wave dispersion and attenuation within the acoustic regime for both elastic and viscoelastic layered composites.

scholarly journals Wave Dispersion and Attenuation in Viscoelastic Split Hopkinson Pressure Bar

1998 ◽  
Vol 5 (5-6) ◽  
pp. 307-315 ◽  
Author(s):  
Z.Q. Cheng ◽  
J.R. Crandall ◽  
W.D. Pilkey
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Soft Materials ◽  
Wave Dispersion ◽  
Hopkinson Pressure Bar ◽  
Viscoelastic Wave Propagation ◽  
Split Hopkinson ◽  
Linear Viscoelastic ◽  
Basic Equations ◽  
Pressure Bar ◽  
Dispersion And Attenuation

A viscoelastic split Hopkinson pressure bar intended for testing soft materials with low acoustic impedance is studied. Using one-dimensional linear viscoelastic wave propagation theory, the basic equations have been established for the determination of the stress—strain—strain rate relationship for the tested material. A method, based on the spectral analysis of wave motion and using measured wave signals along the split Hopkinson pressure bar, is developed for the correction of the dispersion and attenuation of viscoelastic waves. Computational simulations are performed to show the feasibility of the method.

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