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Title: 3D Particle-Scale Displacement Gradient to Uncover the Onset of Shear Bands in Sand

Authors:
;  [1]
  1. (Tennessee-K)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Science Foundation (NSF)
OSTI Identifier:
1357619
Resource Type:
Conference
Resource Relation:
Conference: International Workshop on Bifurcation and Degradation of Geomaterials with Engineering Applications ;May 21-25, 2017 ;Limassol, Cyprus
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Druckrey, A.M., and Alshibli, K.A. 3D Particle-Scale Displacement Gradient to Uncover the Onset of Shear Bands in Sand. United States: N. p., 2017. Web. doi:10.1007/978-3-319-56397-8_6.
Druckrey, A.M., & Alshibli, K.A. 3D Particle-Scale Displacement Gradient to Uncover the Onset of Shear Bands in Sand. United States. doi:10.1007/978-3-319-56397-8_6.
Druckrey, A.M., and Alshibli, K.A. 2017. "3D Particle-Scale Displacement Gradient to Uncover the Onset of Shear Bands in Sand". United States. doi:10.1007/978-3-319-56397-8_6.
@article{osti_1357619,
title = {3D Particle-Scale Displacement Gradient to Uncover the Onset of Shear Bands in Sand},
author = {Druckrey, A.M. and Alshibli, K.A.},
abstractNote = {},
doi = {10.1007/978-3-319-56397-8_6},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 5
}

Conference:
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  • The phenomenon of dynamic initiation and propagation of two-dimensional adiabatic shear bands is experimentally and numerically investigated. Prenotched metal plates are subjected to asymmetric impact load histories (dynamic mode-II loading). Dynamic shear bands emanate from the notch-tip and propagate rapidly in a direction nearly parallel to the direction of impact. Real time temperature histories along a line intersecting and perpendicular to the shear band paths are recorded by means of a high speed infrared detector system. The materials studied are C-300 (a maraging steel), HY-100 steel and Ti-6Al-4V. Experiments show that the peak temperatures inside the propagating shear bands aremore » approaching 90% of the melting point for C-300 and are significantly lower for the titanium alloy (up to 6000C). Additionally, measured distances of shear band propagation indicate stronger resistance to shear banding by HY-100 steel and Ti-6Al-4V. Deformation fields around the propagating shear band are recorded using high speed photography. Shear band speeds are found to strongly depend on impact velocity are as high as 1200 m/s for C-300 steel. Finite element simulations of the experiment are carried out under the context of plane strain, considering finite deformations, inertia, heat conduction, thermal softening, strain hardening and strain-rate hardening. In the simulations, the shear band propagation is assumed to be governed by a critical plastic strain criterion. The results are compared with experimental measurements obtained using the high speed infrared detectors and high speed photography. Finally, the numerical calculations are used to investigate motions of shear band toughness. The shear band driving force is calculated as a function of shear band velocity and compared to the crack driving force versus velocity relations for mode-I, opening cracks in the same material.« less
  • This study presents a dimensionless number and its critical value for predicting the onset of instability during immiscible displacement in porous media. Obtained from a stability theory, the critical dimensionless number for a cylindrical system successfully predicted the onset of instability in laboratory floods. Therefore, this number can be used to classify the stability of 2-phase incompressible displacements in porous media. 14 references.
  • Wormlike micellar salt/surfactant solutions (X-salicylate, cetylpyridinium chloride) are studied with respect to the applied shear stress, concentration, temperature, and composition of the counterions (X = lithium, sodium, potassium, magnesium, and calcium) of the salicylate salt solute to determine vorticity and gradient shear bands. A combination of rheological measurements, laser technique, video analysis, and rheo-small-angle neutron scattering allow for a detailed exploration of number and types of shear bands. Typical flow curves of the solutions show Newtonian, shear-thinning, and shear-thickening flow behavior. In the shear-thickening regime, the solutions show vorticity and gradient shear bands simultaneously, in which vorticity shear bands dominate the visualmore » effect, while gradient shear bands always coexist and predominate the rheological response. It is shown that gradient shear bands change their phases (turbid, clear) with the same frequency as the shear rate oscillates, whereas vorticity shear bands change their phases with half the frequency of the shear rate. Furthermore, we show that with increasing molecular mass of the counterions the number of gradient shear bands increases, while the number of vorticity shear bands remains constant. The variation of temperature, shear stress, concentration, and counterions results in a predictable change in the rheological behavior and therefore allows adjustment of the number of vorticity shear bands in the shear band regime.« less
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  • Shell, in conjunction with the United States of America Department of Energy, is conducting a gravity stable displacement field test of the miscible CO/sub 2/ process. The test is being conducted in the portion of a fault sealed reservoir lying below a subsea depth of -12,750 feet. Injection of the CO/sub 2/ slug at the producing gas-oil contact commenced in October 1978. Injection of the 860 MM cubic foot slug was completed in February of 1980. The slug of CO/sub 2/ was moved downward through the watered out sand by production of downdip water. The leading edge of teh displacementmore » has reached the producing perforations and production of the oil column commenced on January 26, 1981. Conventional cores and the low-inject-log technique were used to determine residual oil saturation in a well drilled as the pilot producer. Pulsed neutron logging devices have been used to detect the CO/sub 2/ slug and monitor its subsequent movements in the vicinity of the production well. The monitor logs indicate the thickness of the oil column had increased during the displacement to the production perforations located 130 feet below the level of CO/sub 2/ injection. The 23 foot oil column remaining at initiation of the project had apparently grown to 57 feet. PVT samples and production data indicate CO/sub 2/ has penetrated the oil column and free gas is being produced with the oil. However, the qualitative measurements of the logs do not indicate a large gas or CO/sub 2/ content in the oil column.« less