Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session I05: Granular MaterialsRecordings Available
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Chair: Gregory Kennedy, Georgia Institute of Technology Room: Anaheim Marriott Platinum 3 |
Tuesday, July 12, 2022 9:15AM - 9:30AM |
I05.00001: Mesoscale simulations of pressure-shear loading of granular tungsten carbide Brian J Demaske Numerical simulations of pressure-shear loading of a granular material are performed using the shock physics code CTH. A simple mesoscale model for the granular material is used with baseline parameters for WC taken from previous mesoscale modeling work. Simulations are performed at the same initial conditions of pressure-shear experiments on dry WC powders. Except for some localized flow regions, the simulated samples respond elastically during shear, which is in contrast to experiment. By extending the simulations to higher shear wave amplitudes, macroscopic shear failure of the samples is observed with the shear strength increasing with increasing stress confinement. The shear strength is found to be strongly dependent on the grain interface treatment and on the intragranular fracture stress. At partial compactions, transverse velocity histories show strain-hardening behavior followed by formation of a shear interface that spans the transverse dimensions of the sample. Near full compaction, no strain hardening is observed and there is a sharp transition from an elastic response to formation of an internal shear interface. Agreement with experiment is shown to worsen with increasing confinement stress with simulations overpredicting shear strengths measured in experiment. |
Tuesday, July 12, 2022 9:30AM - 9:45AM |
I05.00002: High-Pressure Dynamic Strength Measurements and Continuum Modeling of Granular Boron Carbide via the Tamped Richtmyer-Meshkov Instability Method Travis J Voorhees, Brittany Branch, Anirban Mandal, Matthew C Hudspeth, Seth Root, Tracy J Vogler The high-pressure dynamic strength of granular B4C (ρ00=0.85 g/cm3, 33% TMD) is determined through coupled experiments and numerical simulations. Plate impact experiments are performed at the Advanced Photon Source’s Dynamic Compression Sector using the tamped Richtmyer-Meshkov instability configuration, in which a planar shock wave is driven through a corrugated Cu driver-B4C tamper interface forcing the corrugation to invert and penetrate the shock compressed B4C tamper. Depth of inversion (jet length), corrugation contour, and shock wave propagation are measured using multiframe X-ray phase contrast imaging. Numerical simulations are performed using the Eulerian hydrocode CTH and calibrated against these experimentally measured values. B4C bulk yield strength, Y, as a function of shock pressure, P, is determined for each impact experiment. The assembly of these P-Y data points illustrate the pressure-dependent yield surface of granular B4C. |
Tuesday, July 12, 2022 9:45AM - 10:00AM |
I05.00003: Effects of Porosity on Spall Failure of Additively Manufactured 316L Stainless Steel Taylor Sloop, Katie D Koube, Kevin Lamb, Sudarsanam S Babu, Joshua Kacher, Naresh N Thadhani Additive manufacturing (AM) of stainless steels allows for tuning of mechanical properties for unique functionalities, and stainless steel is a prime candidate for use in many applications due to its existing high strength, ductility, and corrosion resistance. AM fabricated 316L stainless steel samples with intentionally random pore placement are compared to samples with known pore placement to study the interaction of the shock wave with individual and grouped pores. Velocity profiles were obtained using photon doppler velocimetry (PDV) probes placed strategically along the location of the known pores to understand the limits of local influence for the known pores. Postmortem characterization of soft-recovered samples using electron backscatter diffraction and transmission electron microscopy was performed to investigate the strain accommodation around pores. It is observed that shock wave fronts are highly dispersed and slow as they propagate through the pore due to strain accommodation around individual pores. As a result, there is shifting of the spall plane away from the impact face. This slow wave front also results in a slow rise time and la |
Tuesday, July 12, 2022 10:00AM - 10:15AM |
I05.00004: Investigating the dynamic response of heterogeneous mixtures with variable geometric complexity Rafee Mahbub, John P Borg, Jack D Borg, Ronald Coutu The dynamic response of an energetic surrogate mixture of sugar and Polydimethylsiloxane (PDMS) / UV curing resin, subjected to uniaxial loading, is investigated. Of particular interest in this investigation are the fluctuations observed at the Hugoniot states of heterogeneous mixtures. This research seeks to better understand what portion of these fluctuations can be attributed to the simple mechanical response of the meso-structure of the mixture. The approach is to build samples with increasing complexity, experimentally load them and simulate them, so that direct comparisons can be made. Samples were fabricated with a single sugar cube, and two sugar cubes with varying distances between them embedded within the binder material. After samples were built, the 3D geometry was obtained using XCT scans. PDV probes were focused at specified locations within the heterogeneous mixture so that a more direct comparison between experiments and simulations could be obtained. Experiments were performed in a one-dimensional plain strain configuration with shot velocities ranging between 79 m/s and 573 m/s. Velocity and some temperature measurements were made on the target. Numerical simulations are performed utilizing one-dimensional Lagrangian (KO) and three-dimensional Eulerian (CTH) approaches. The results indicate a systematic response signature superimposed on the Hugoniot plateau which is correlated to the geometry. |
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