...., pressures of 0.0–1.0 MPa). The video images recorded during the tests were analyzed to determine whether or not fluid exchange between the PDL and the surrounding medium took place during mechanical loading. A value for the tissue’s apparent Poisson ratio was also determined. The following observations were...

... have subsided. In particular, this model can predict the transition of Poisson’s ratio from very low values in compression ( ∼ 0.02 ) to very high values in tension ( ∼ 2.0 ) . Most of these phenomena cannot be explained when using only three orthogonal fiber bundles to describe the tissue matrix...

... contact elements. This ensures the rigid bonding between the needle and the gel. The modulus value for the gel is taken as Young’s modulus obtained from the bead test for each of the three gels, and Poisson’s ratio of 0.49 is taken assuming the gel to be nearly incompressible ( 26 27 ). The force...

... employing the strong interaction terms is to provide the capability for modeling anisotropic and asymmetric Poisson’s ratios, as well as axial stress–axial strain responses, in tension and compression for finite deformations. 01 05 2006 15 09 2006 biomechanics biological tissues stress...

...: Young’s modulus, 2.0 MPa ; Poisson’s ratio, 0.20; and hydraulic permeability, 1.1 × 10 − 16 m 4 ∕ N ‐ s ) were found to be of similar orders of magnitude as previous findings for other animal cartilages, including human, bovine, rat, and rabbit and demonstrate the utility of the new test methods...

... and Poisson’s ratio were greater ( p = 0.02 ) than that in modulus by 10.8- and 26.6-fold, respectively, indicating that, for the specimen configuration used in this study, longitudinal elastic modulus is one of the least sensitive properties to a compressive overload. Residual strains were also proportionately...

..., respectively. The mean stress relaxation rate for static loading was best fit with a first-order polynomial: B ε = − 0.04 ε − 0.06 . Capsule strength parallel and perpendicular to collagen fiber orientation was 1.90 and 0.95 MPa, respectively, and extensibility was 0.65 and 0.60, respectively. Poisson’s ratio...

... predicted for normal and shear loading of fibrils. Model predictions resulted in transversely isotropic collagen fibrils in which the modulus along the longer axis of the fibril was the greatest. All the elastic moduli increased with increasing mineral volume fraction whereas Poisson’s ratios decreased...

...Hui Jin; Jack L. Lewis Articular cartilage is often characterized as an isotropic elastic material with no interstitial fluid flow during instantaneous and equilibrium conditions, and indentation testing commonly used to deduce material properties of Young’s modulus and Poisson’s ratio. Since only...

.... In biphasic and poroelastic theories, the effect of charges fixed on the proteoglycan macromolecules in articular cartilage is embodied in the apparent compressive Young’s modulus and the apparent Poisson’s ratio of the tissue, and the fluid pressure is considered to be the portion above the osmotic pressure...

... ) and Poisson’s ratios ( ν 12 = 2.13 , ν 21 = 1.50 , ν 23 = 1.02 ) . However, a significant effect of anisotropy on permeability was not detected ( k 1 = 0.09 × 10 − 16 m 4 / Ns , k 2 = 0.10 × 10 − 16 m 4 / Ns ) . The low permeability values determined in this study provide insight into the extent of fluid...

...Dawn M. Elliott; Daria A. Narmoneva; Lori A. Setton Articular cartilage has been shown to exhibit large transverse contractions when loaded in tension, suggesting the existence of large values for the Poisson’s ratio. Previous studies have suggested that this effect is dependent on amplitude...

... Mises stress was dramatically reduced when the Poisson’s ratio was increased from 0.05 to 0.49 under an axial compressive load of 1400 N, while peak hydrostatic pressure was dramatically increased. Peak surface pressure was also increased with the Poisson’s ratio, but with a lower magnitude compared...

...Dawn M. Elliott; Lori A. Setton The anulus fibrosus (AF) of the intervertebral disc exhibits spatial variations in structure and composition that give rise to both anisotropy and inhomogeneity in its material behaviors in tension. In this study, the tensile moduli and Poisson’s ratios were measured...

... ± 0.97 × 10 − 16 m 4 / N s ˙ s , r 2 = 0.95 ± 0.03 ) , the tensile modulus, compressive Poisson ratio, and radial permeability were obtained from unconfined compression ( E + Y = 12.75 ± 1.56 MPa, v − = 0.03 ± 0.01 , k r = 6.06 ± 2.10 × 10 − 16 m 4 / N s ˙ s , r 2 = 0.99 ± 0.00 ) , and the shear modulus...