The effect of moisture on compressional and shear wave speeds in unconsolidated granular materials

2000 ◽  
Vol 107 (5) ◽  
pp. 2880-2880
Author(s):  
F. Douglas Shields ◽  
Jim Sabatier ◽  
Mark Wang
Keyword(s):  
Granular Materials ◽  
Shear Wave ◽  
Wave Speeds ◽  
Effect Of Moisture

scholarly journals Shear wave speeds at the base of the mantle

2000 ◽  
Vol 105 (B9) ◽  
pp. 21543-21557 ◽  
Author(s):  
John C. Castle ◽  
Kenneth C. Creager ◽  
John P. Winchester ◽  
Rob D. van der Hilst
Keyword(s):  
Shear Wave ◽  
Wave Speeds

Effect of moisture and magnesium stearate concentration on flow properties of cohesive granular materials

2007 ◽  
Vol 336 (2) ◽  
pp. 338-345 ◽  
Author(s):  
Abdul Mobeen N. Faqih ◽  
Amit Mehrotra ◽  
Stephen V. Hammond ◽  
Fernando J. Muzzio
Keyword(s):  
Granular Materials ◽  
Magnesium Stearate ◽  
Flow Properties ◽  
Effect Of Moisture

Sensitivity of the Shear Wave Speed-Stress Relationship to Soft Tissue Material Properties and Fiber Alignment

2021 ◽  
Author(s):  
Jonathon Blank ◽  
Darryl Thelen ◽  
Matthew S. Allen ◽  
Joshua Roth
Keyword(s):  
Wave Propagation ◽  
Shear Modulus ◽  
Shear Wave ◽  
Wave Speed ◽  
Axial Stress ◽  
Beam Model ◽  
Fiber Alignment ◽  
Wave Speeds ◽  
Shear Wave Speed ◽  
Constitutive Properties

The use of shear wave propagation to noninvasively gauge material properties and loading in tendons and ligaments is a growing area of interest in biomechanics. Prior models and experiments suggest that shear wave speed primarily depends on the apparent shear modulus (i.e., shear modulus accounting for contributions from all constituents) at low loads, and then increases with axial stress when axially loaded. However, differences in the magnitudes of shear wave speeds between ligaments and tendons, which have different substructures, suggest that the tissue’s composition and fiber alignment may also affect shear wave propagation. Accordingly, the objectives of this study were to (1) characterize changes in the apparent shear modulus induced by variations in constitutive properties and fiber alignment, and (2) determine the sensitivity of the shear wave speed-stress relationship to variations in constitutive properties and fiber alignment. To enable systematic variations of both constitutive properties and fiber alignment, we developed a finite element model that represented an isotropic ground matrix with an embedded fiber distribution. Using this model, we performed dynamic simulations of shear wave propagation at axial strains from 0% to 10%. We characterized the shear wave speed-stress relationship using a simple linear regression between shear wave speed squared and axial stress, which is based on an analytical relationship derived from a tensioned beam model. We found that predicted shear wave speeds were both in-range with shear wave speeds in previous in vivo and ex vivo studies, and strongly correlated with the axial stress (R2 = 0.99). The slope of the squared shear wave speed-axial stress relationship was highly sensitive to changes in tissue density. Both the intercept of this relationship and the apparent shear modulus were sensitive to both the shear modulus of the ground matrix and the stiffness of the fibers’ toe-region when the fibers were less well-aligned to the loading direction. We also determined that the tensioned beam model overpredicted the axial tissue stress with increasing load when the model had less well-aligned fibers. This indicates that the shear wave speed increases likely in response to a load-dependent increase in the apparent shear modulus. Our findings suggest that researchers may need to consider both the material and structural properties (i.e., fiber alignment) of tendon and ligament when measuring shear wave speeds in pathological tissues or tissues with less well-aligned fibers.

Acoustoelasticity in Layered Composites

1990 ◽  
Vol 112 (3) ◽  
pp. 266-270 ◽  
Author(s):  
G. T. Mase ◽  
T. E. Wong ◽  
G. C. Johnson
Keyword(s):  
Residual Stresses ◽  
Shear Wave ◽  
Anisotropic Materials ◽  
Layered Composites ◽  
Nondestructive Technique ◽  
Wave Speeds ◽  
Composites Materials ◽  
Highly Nonlinear ◽  
Rolled Aluminum ◽  
Aluminum Plates

Acoustoelasticity is a nondestructive technique used for determining applied and residual stresses in structural materials. It is based on the fact that as a material undergoes deformation, the longitudinal and shear wave speeds change. This technique has been successfully used in slightly anisotropic materials such as rolled aluminum plates. The purpose of this study is to examine the acoustoelastic response in layered composites: materials which are extremely anisotropic. The acoustoelastic response of these polymers is highly nonlinear and very different than that of metals.

Liver fibrosis structure effects on viscoelasticity estimation using group shear wave speeds

2019 ◽  
Author(s):  
Kai Miyake ◽  
Makoto Yamakawa ◽  
Kengo Kondo ◽  
Takeshi Namita ◽  
Tsuyoshi Shiina
Keyword(s):  
Liver Fibrosis ◽  
Shear Wave ◽  
Wave Speeds
Sign in / Sign up

Export Citation Format

Share Document