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Effects of pore collapse and grain crushing on ultrasonic,

21/08/2007· In sandstones, pore collapse is a result of grain crushing [Zhang et al., 1990; Ménendez et al., 1996] as porosity reduction is the consequence of the filling of pore space by fragmented grains. In limestones, however, pore collapse is the result of intragranular plasticity of calcite, i.e., twinning and dislocation glide [ Fredrich et al. , 1989 ; Baud et al. , 2000b ; Vajdova et al. , 2004,Effects of pore collapse and grain crushing on ultrasonic,,Effects of pore collapse and grain crushing on ultrasonic velocities and V p/V s Je´roˆme Fortin,1 Yves Gue´guen,1 and Alexandre Schubnel2 Received 20 August 2005; revised 13 February 2007; accepted 6 June 2007; published 21 August 2007. [1] Compressional, shear wave velocities and their ratio, V p/V s, were measured along with porosity variations during wet and dry hydrostatic compaction,(PDF) Effects of pore collapse and grain crushing on,,50 pore collapse and grain crushing (nonlocalized cataclastic 51 flow) [ Zhang et al. , 1990; W ong et al. , 1997]. 52 [ 3 ] Recent field [ Mollema and Anto nellini , 1996], and

Effects of pore collapse and grain crushing on ultrasonic,

21/08/2007· At a critical effective confining pressure P*, a large mechanical decrease of porosity was observed that was due to pore collapse and grain crushing. Theoretically, two different processes are affecting the elastic wave velocities in counteracting ways during cataclastic compaction: cracking and porosity decrease. Our experimental results show that cracking is the dominant effect, so that,Effects of pore collapse and grain crushing on ultrasonic,,2 Effects of pore collapse and grain crushing on 3 ultrasonic velocities and V p/V s 4 Je´roˆme Fortin,1 Yves Gue´guen,1 and Alexandre Schubnel2 5 Received 20 August 2005; revised 13 February,Effects of pore collapse and grain crushing on ultrasonic,,At first, increase in hydrostatic pressure was accompanied by a simultaneous increase of both V p and V s as expected. At a critical effective confining pressure P*, a large mechanical decrease of porosity was observed that was due to pore collapse and grain crushing. Theoretically, two different processes are affecting the elastic wave,

Ultrasonic investigation of granular materials subjected,

01/07/2018· In other attempts, variations in ultrasonic wave velocity were related to pore collapse and grain crushing in sand and sandstone materials , , . These experimental works related the observed rate of variations in shear and compressional wave velocities during compression to (a) particle crushing and (b) porosity reduction [48] .Effect of Pore Collapse and Grain Crushing on the,,29/07/2020· A saturated Bleurswiller sandstone, of 25% porosity, was compacted by increasing the confining pressure over the critical pressure P* which characterizes the onset of pore collapse and grain crushing. The frequency-dependence of Young’s moduli were measured before and after the compaction using forced-oscillation method in a triaxial cell. For the intact and compacted samples,pore collapse and grain crushing on ultrasonic,01-07-2018· In other attempts, variations in ultrasonic wave velocity were related to pore collapse and grain crushing in sand and sandstone materials,, . These experimental works related the observed rate of variations in shear and compressional wave velocities during compression to (a) particle crushing and (b) porosity reduction [48] .

pore collapse and grain crushing on ultrasonic

Effects of pore collapse and grain crushing on ultrasonic. was due to pore collapse and grain crushing. Theoretically, two different processes are affecting the elastic wave velocities in counteracting ways during cataclastic compaction: cracking and porosity decrease. Our experimental results show that cracking is the dominant effect, so that,pore collapse and grain crushing on ultrasonic - Gold,Consequences of pore collapse and grain crushing on ultrasonic velocities and Vp/Vs ratio, J. Fortin, Y. Guéguen and A. Schubnel, accepted in Journal of Geophysical Education International Journal of Rock Mechanics and Mining Sciences, 2006.Ultrasonic investigation of granular materials subjected,,01/07/2018· In other attempts, variations in ultrasonic wave velocity were related to pore collapse and grain crushing in sand and sandstone materials , , . These experimental works related the observed rate of variations in shear and compressional wave velocities during compression to (a) particle crushing and (b) porosity reduction [48] .

Effect of ultrasonic cavitation on small and large,

bles collapse as pressure increases following a reduction in velocity, energy is released in the form of local heat and pressure waves, which can reach magnitudes of several thousand bars at the point of collapse (Kalumuck, Hsiao, Chahine, & Choet, 2003). This has an erosive effect, which makes cavitation an unwanted phenomenon in most contexts. Cavitation can, however, be used for,Ultrasound, liposomes, and drug delivery: principles for,,Ultrasound is used in many medical applications, such as imaging, blood flow analysis, dentistry, liposuction, tumor and fibroid ablation, and kidney stone disruption. In the past, low frequency ultrasound (LFUS) was the main method to downsize multilamellar (micron range) vesicles into small (nano scale) unilamellar vesicles. Recently, the ability of ultrasound to induce localized and,solid/fluid substitution scheme constrained by pore,In order to account for the pressure dependency of the elastic moduli, Sun et al. proposed a triple-porosity model, in which the pore space is divided into stiff, intermediate and compliant pores.This triple-porosity structure is necessary for adequate characterization of the pore geometry, which in turn is essential for modelling the fluid effects (de Paula et al.2012; Sun et al.2018).

Laboratory measurements of low- and high-frequency elastic,

ranges in which rocks are far from conditions of grain crushing and pore collapse. Currently, their equipment is being modified to allow for torsional and flexural oscillation measurements (Jack-son et al., 2011). A complete set of elastic moduli (Young’s modu-lus and Poisson’s ratio) is measured on a dry and glycerin-saturated sandstone by Batzle et al. (2001, 2006), at low effective,pore collapse and grain crushing on ultrasonic 国内版,pore collapse and grain crushing on ultrasonic 国内版 Obtenga precio y soporte . Sustainability problems of the Giza pyramids . The Pyramids complex in Giza consists of three main pyramids in addition to the famous Sphinx and small queen's pyramids. Recently, the pyramids of Cheops (Khufu), Chephren (Khafre) and Mykerinos (Menkaure) on the Giza plateau have been threatened by a rising,The use of ultrasonic cavitation for kidney stone crush,14/05/2012· The use of ultrasonic cavitation for kidney stone crush Large kidney stones can obstruct the urethra and cause severe pain or infection. Current non-invasive approach for kidney stone crush called extracorporeal shock wave lithotripsy has been employed since 1980. In ESWL, multiple shock waves with various pulse repetition frequency (PRF) are used to shatter the stones. For some

pore collapse and grain crushing on ultrasonic

Effects of pore collapse and grain crushing on ultrasonic. was due to pore collapse and grain crushing. Theoretically, two different processes are affecting the elastic wave velocities in counteracting ways during cataclastic compaction: cracking and porosity decrease. Our experimental results show that cracking is the dominant effect, so that,Real-Time Imaging of the Process of Stone Crushing by,,A new method of lithotripsy combining high and low frequency ultrasound has been investigated. This method controls generation of cavitation only on the stone surface and utilizes collapse pressure of the bubbles. In order to apply this method for clinical practice, it is important to monitor the process of stone crushing and behavior of cavitation from outside the body.CLOUD CAVITATION CONTROL FOR A THERAPEUTIC ULTRASOUND,,protocol are explained and the results of the stone crushing are also discussed. SCHEMATIC OF CLOUD CAVITATION CONTROL Fig. 1 shows the schematic of Cavitation Control Lithotripsy (CCL). CCL method is comprised of two different of ultrasound frequencies. First, higher frequency ultrasound is focused at the stone surface (Fig. 1-1). It has a range about 1 ~ 5 MHz in its frequency for a shorter,

NUMERICAL MODELING OF PORE SPACE COLLAPSE DUE TO

stone at Meteor Crater, Arizona [7], suggested already decades ago that pore closure and shock wave propaga-tion due to high impedances contrast between pores and solid components results in very heterogeneous distribution of crystalline polymorphs or other shock wave features within one sample. It is therefore of particular interest to investigate pore closure due to shock wave compression in,Effect of ultrasonic cavitation on small and large,,bles collapse as pressure increases following a reduction in velocity, energy is released in the form of local heat and pressure waves, which can reach magnitudes of several thousand bars at the point of collapse (Kalumuck, Hsiao, Chahine, & Choet, 2003). This has an erosive effect, which makes cavitation an unwanted phenomenon in most contexts. Cavitation can, however, be used for,Laboratory measurements of low- and high-frequency elastic,,ranges in which rocks are far from conditions of grain crushing and pore collapse. Currently, their equipment is being modified to allow for torsional and flexural oscillation measurements (Jack-son et al., 2011). A complete set of elastic moduli (Young’s modu-lus and Poisson’s ratio) is measured on a dry and glycerin-saturated sandstone by Batzle et al. (2001, 2006), at low effective,

Separation of Tensile and Shear Cracks Based on Acoustic,

Pore collapse and grain crushing prevail in the process zone of sandstone and the amount of tensile cracks is much smaller than in granite. References. Glaser, S.D. & Nelson, P.P. 1992. Acoustic emissions produced by discrete fracture in rock. Part 2.pore collapse and grain crushing on ultrasonic 国内版,pore collapse and grain crushing on ultrasonic 国内版 Obtenga precio y soporte . Sustainability problems of the Giza pyramids . The Pyramids complex in Giza consists of three main pyramids in addition to the famous Sphinx and small queen's pyramids. Recently, the pyramids of Cheops (Khufu), Chephren (Khafre) and Mykerinos (Menkaure) on the Giza plateau have been threatened by a rising,Casting defect - Wikipedia,A casting defect is an undesired irregularity in a metal casting process. Some defects can be tolerated while others can be repaired, otherwise they must be eliminated. They are broken down into five main categories: gas porosity, shrinkage defects, mould material defects, pouring metal defects, and metallurgical defects.

Cavitation - Wikipedia

Cavitation is a phenomenon in which the static pressure of the liquid reduces to below the liquid's vapour pressure, leading to the formation of small vapor-filled cavities in the liquid.When subjected to higher pressure, these cavities, called "bubbles" or "voids", collapse and can generate shock waves that may damage machinery. These shock waves are strong when they are very close to the,,,