scholarly journals Dynamic elastic moduli during isotropic densification of initially granular media

2016 ◽  
Vol 204 (3) ◽  
pp. 1721-1728 ◽  
Author(s):  
Jérémie Vasseur ◽  
Fabian B. Wadsworth ◽  
Yan Lavallée ◽  
Donald B. Dingwell
Keyword(s):  
Granular Media ◽  
Elastic Moduli ◽  
Dynamic Elastic Moduli

scholarly journals Temperature dependence of dynamic elastic moduli of wrought aluminum alloys

1972 ◽  
Vol 22 (12) ◽  
pp. 710-715 ◽  
Author(s):  
Hiroshi NEWKO ◽  
Shigeo ZAIMA ◽  
Yoitiro TAKEUTI ◽  
Kazuo TAMARU
Keyword(s):  
Aluminum Alloys ◽  
Temperature Dependence ◽  
Elastic Moduli ◽  
Dynamic Elastic Moduli ◽  
Wrought Aluminum Alloys ◽  
Wrought Aluminum

Static and dynamic elastic moduli of rock in a complex axisymmetric stressed state

1984 ◽  
Vol 20 (5) ◽  
pp. 343-350 ◽  
Author(s):  
A. N. Stavrogin ◽  
G. G. Zaretskii-Feoktistov ◽  
G. N. Tanov
Keyword(s):  
Stressed State ◽  
Elastic Moduli ◽  
Dynamic Elastic Moduli

Static and Dynamic Elastic Moduli of Bakken Formation

2019 ◽  
Author(s):  
Jun He ◽  
Kegang Ling ◽  
Xingru Wu ◽  
Peng Pei ◽  
Hui Pu
Keyword(s):  
Elastic Moduli ◽  
Bakken Formation ◽  
Dynamic Elastic Moduli

scholarly journals The permeability and elastic moduli of tuff from Campi Flegrei, Italy: implications for ground deformation modelling

Solid Earth ◽  
2014 ◽  
Vol 5 (1) ◽  
pp. 25-44 ◽  
Author(s):  
M. J. Heap ◽  
P. Baud ◽  
P. G. Meredith ◽  
S. Vinciguerra ◽  
T. Reuschlé
Keyword(s):  
Ultrasonic Wave ◽  
Elastic Moduli ◽  
Ground Deformation ◽  
Laboratory Data ◽  
Campi Flegrei ◽  
Pore Collapse ◽  
Campanian Ignimbrite ◽  
Wave Velocities ◽  
Neapolitan Yellow Tuff ◽  
Dynamic Elastic Moduli

Abstract. The accuracy of ground deformation modelling at active volcanoes is a principal requirement in volcanic hazard mitigation. However, the reliability of such models relies on the accuracy of the rock physical property (permeability and elastic moduli) input parameters. Unfortunately, laboratory-derived values on representative rocks are usually rare. To this end we have performed a systematic laboratory study on the influence of pressure and temperature on the permeability and elastic moduli of samples from the two most widespread lithified pyroclastic deposits at the Campi Flegrei volcanic district, Italy. Our data show that the water permeability of Neapolitan Yellow Tuff and a tuff from the Campanian Ignimbrite differ by about 1.5 orders of magnitude. As pressure (depth) increases beyond the critical point for inelastic pore collapse (at an effective pressure of 10–15 MPa, or a depth of about 750 m), permeability and porosity decrease significantly, and ultrasonic wave velocities and dynamic elastic moduli increase significantly. Increasing the thermal stressing temperature increases the permeability and decreases the ultrasonic wave velocities and dynamic elastic moduli of the Neapolitan Yellow Tuff; whereas the tuff from the Campanian Ignimbrite remains unaffected. This difference is due to the presence of thermally unstable zeolites within the Neapolitan Yellow Tuff. For both rocks we also find, under the same pressure conditions, that the dynamic (calculated from ultrasonic wave velocities) and static (calculated from triaxial stress-strain data) elastic moduli differ significantly. The choice of elastic moduli in ground deformation modelling is therefore an important consideration. While we urge that these new laboratory data should be considered in routine ground deformation modelling, we highlight the challenges for ground deformation modelling based on the heterogeneous nature (vertically and laterally) of the rocks that comprise the caldera at Campi Flegrei.

On a Spring-Network Model and Effective Elastic Moduli of Granular Materials

1999 ◽  
Vol 66 (1) ◽  
pp. 172-180 ◽  
Author(s):  
K. Alzebdeh ◽  
M. Ostoja-Starzewaski
Keyword(s):  
Granular Materials ◽  
Disordered Systems ◽  
Granular Media ◽  
Elastic Moduli ◽  
Volume Fraction ◽  
Effective Medium ◽  
Solid State Physics ◽  
Two Phase ◽  
Effective Medium Theories ◽  
The Individual

Two challenges in mechanics of granular media are taken up in this paper: (i) development of adequate numerical discrete element models of topologically disordered granular assemblies, and (ii) calculation of macroscopic elastic moduli of such materials using effective medium theories. Consideration of the first one leads to an adaptation of a spring-network (Kirkwood) model of solid-state physics to disordered systems, which is developed in the context of planar Delaunay networks. The model employs two linear springs: a normal one along an edge connecting two neighboring vertices (grain centers) which accounts for normal interactions between the grains, as well as an angular one which accounts for angle changes between two edges incident onto the same vertex; edges remain straight and grain rotations do not appear. This model is then used to predict elastic moduli of two-phase granular materials—random mixtures of soft and stiff grains —for high coordination numbers. It is found here that an effective Poisson’s ratio, νeff, of such a mixture is a convex function of the volume fraction, so that νeff may become negative when the individual Poisson’s ratios of both phases are both positive. Additionally, the usefulness of three effective medium theories—perfect disks, symmetric ellipses, and asymmetric ellipses—is tested.

scholarly journals An experimental investigation of dynamic elastic moduli and acoustic velocities in heterogeneous carbonate oil reservoirs

2019 ◽  
Vol 1 (9) ◽  
Author(s):  
Ali Shakouri ◽  
Oveis Farzay ◽  
Mohsen Masihi ◽  
M. H. Ghazanfari ◽  
A. M. Al-Ajmi
Keyword(s):  
Experimental Investigation ◽  
Elastic Moduli ◽  
Oil Reservoirs ◽  
Dynamic Elastic Moduli ◽  
Acoustic Velocities
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