The Porous Frame

2015 ◽  
pp. 117-145 ◽  
Author(s):  
Hamish Ford
Keyword(s):  
2009 ◽  
Vol 117 (1364) ◽  
pp. 521-524 ◽  
Author(s):  
Liyun ZHOU ◽  
Deping WANG ◽  
Wenhai HUANG ◽  
Aihua YAO ◽  
Masanobu KAMITAKAHARA ◽  
...  
Keyword(s):  

Geophysics ◽  
2003 ◽  
Vol 68 (2) ◽  
pp. 430-440 ◽  
Author(s):  
Tad M. Smith ◽  
Carl H. Sondergeld ◽  
Chandra S. Rai

Fluid substitution is an important part of seismic attribute work, because it provides the interpreter with a tool for modeling and quantifying the various fluid scenarios which might give rise to an observed amplitude variation with offset (AVO) or 4D response. The most commonly used technique for doing this involves the application of Gassmann's equations. Modeling the changes from one fluid type to another requires that the effects of the starting fluid first be removed prior to modeling the new fluid. In practice, the rock is drained of its initial pore fluid, and the moduli (bulk and shear) and bulk density of the porous frame are calculated. Once the porous frame properties are properly determined, the rock is saturated with the new pore fluid, and the new effective bulk modulus and density are calculated. A direct result of Gassmann's equations is that the shear modulus for an isotropic material is independent of pore fluid, and therefore remains constant during the fluid substitution process. In the case of disconnected or cracklike pores, however, this assumption may be violated. Once the values for the new effective bulk modulus and bulk density are calculated, it is possible to calculate the compressional and shear velocities for the new fluid conditions. There are other approaches to fluid substitution (empirical and heuristic) which avoid the porous frame calculations but, as described in this tutorial, often do not yield reliable results. This tutorial provides the reader with a recipe for performing fluid substitutions, as well as insight into why and when the approach may fail.


2007 ◽  
Vol 121 (1) ◽  
pp. 78-84 ◽  
Author(s):  
Jean F. Allard ◽  
Bruno Brouard ◽  
Noureddine Atalla ◽  
Sebastian Ghinet
Keyword(s):  

Author(s):  
V. A. Gulevsky ◽  
N. Yu. Miroshkin ◽  
S. N. Tsurikhin ◽  
O. Yu. Gundrov

The process of forming a composite material carbon - graphite-aluminum alloy by impregnation of a porous frame AG-1500 is studied. The technology of filling the open porosity of carbon graphite with a metal melt in a device for impregnation in the mode of constant heating of the furnace is described. The method of applying a protective coating to the inner surface of the pores is shown. It is possible to seal the matrix alloy AK12 in the pores of AG-1500 with lead. It is shown that such processing allows to compact the aluminum alloy and modify it due to the comprehensive pressure of the lead alloy.


2010 ◽  
Vol 123-125 ◽  
pp. 303-306
Author(s):  
Joo Eon Park ◽  
Mitsugu Todo

Novel reinforcements such as beam, film, and porous frame were developed to improve the mechanical properties of poly(L-lactide) (PLLA) scaffolds. A solid-liquid phase separation method was used to fabricate porous structures such as core portions and porous frame of reinforced scaffolds. The beam and film reinforcements were also fabricated from PLLA pellets by applying the thermal-press technique. In the standard scaffold, the localized deformation was characterized as buckling of the pore structures. On the contrary, the primary microstructural deformation mechanism in the beam and the film reinforced scaffolds was characterized as buckling deformation and interfacial failure of the matrix and the reinforcement respectively. It is also seen that the inner porous structure could maintain the initial structure without local buckling of the pore structure. The compressive mechanical properties of the reinforced scaffolds were dramatically improved by about 2 ~ 5 times compared to the standard scaffold.


2020 ◽  
Vol 1011 ◽  
pp. 164-170
Author(s):  
Vladimir Erofeev ◽  
Dmitriy Gubanov ◽  
Andrey Bogatov ◽  
Alexey Bulgakov

Recently, the frame composite materials have been developed greatly at the production introduction level. The manufacturing technology of these materials is carried out in two stages: first, large aggregates are glued into the frame, and second, the porous frame voids are impregnated with the matrix component. In this article, we studied the various aggregates’ effect on the polymer concrete frame structures properties using epoxy binders. The materials based on the quenched cullet, brickbats, granite and limestone crushed stone, and the polymer granules were considered as large aggregates. The studied properties were the strength and elastic modulus. Quantitative dependences of compressive and bending strength, elastic modulus of frame composites on the aggregate type and other prescription factors are obtained. Using the methods of mathematical experimental planning, the optimal particle size distribution for the composites with grains from quenched cullet was selected. Particular attention should be paid to the possibility of using industrial wastes in polymer concrete compositions: polymer granules, quenched cullet and brickbats. Used glass makes up about 10% of the household waste. Its reuse is usually associated with high capital costs allocated for sorting glass by color, removing stones and other impurities. Glass grinding allows to get a fine-grained filler and aggregate. Strength and deformation characteristics of the matrix compositions, frameworks and composites as a whole are determined.


Geophysics ◽  
2010 ◽  
Vol 75 (1) ◽  
pp. N19-N31 ◽  
Author(s):  
Abderrahim Jardani ◽  
André Revil ◽  
Evert Slob ◽  
Walter Söllner

The interpretation of seismoelectrical signals is a difficult task because coseismic and seismoelectric converted signals are recorded simultaneously and the seismoelectric conversions are typically several orders of magnitude smaller than the coseismic electrical signals. The seismic and seismoelectric signals are modeled using a finite-element code with perfectly matched layer boundary conditions assuming a linear poroelastic body. We present a stochastic joint inversion of the seismic and seismoelectrical data based on the adaptive Metropolis algorithm, to obtain the posterior probability density functions of the material properties of each geologic unit. This includes the permeability, porosity, electrical conductivity, bulk modulus of the dry porous frame, bulk modulus of the fluid, bulk modulus of the solid phase, and shear modulus of the formations. A test of this approach is performed with a synthetic model comprising two horizontal layers and a reservoir partially saturated with oil, which is embedded in the second layer. The result of the joint inversion shows that we can invert the permeability of the reservoir and its mechanical properties.


Author(s):  
V. A. Gulevsky ◽  
N. Yu. Miroshkin ◽  
S. N. Tsurikhin ◽  
N. A. Kidalov

The process of forming a composite material carbon-graphite-aluminum by impregnating a porous frame AG-1500 with aluminum melt at a temperature of 650С is studied. The redistribution of elements of the impregnating alloy is established. it is shown that the transition of silicon, Nickel, chromium, and iron from the aluminum melt to the «melt - pore surface of carbon graphite» is determined not by the mechanism of chemical localization of conduction electrons, but by the rearrangement of the electronic structure of components during crystallization. In this case, it is possible to change the solubility of the melt elements in aluminum, as a result of the combined action of pressure and temperature on it during the impregnation process.


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