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 C05: Shock Interactions and AMRecordings Available
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Chair: Christopher Neel, Air Force Research Lab - WPAFB Room: Anaheim Marriott Platinum 3 |
Monday, July 11, 2022 11:00AM - 11:15AM |
C05.00001: Shock Compression Behavior of Stainless Steel 316L Octet-Truss Lattice Structures Jack Weeks, Vatsa B Gandhi, Guruswami Ravichandran The compressive shock behavior of stainless steel 316L (SS316L) octet-truss lattice structures was investigated through experimental techniques and numerical simulations. Plate impact experiments were conducted at impact velocities of 270-390 m/s on lattice specimens with 5x5x10 unit cell geometries additively manufactured (AM) using direct metal laser sintering. High-speed imaging with digital image correlation was used to extract full-field measurements of particle velocities and define an elastic wave front and a compaction shock front. A linear shock velocity-particle velocity relation was extracted and may be approximated using a slope of one and linear fit constant equal to the crushing speed. The shock velocity-particle velocity relation was used with the Eulerian form of Rankine-Hugoniot jump conditions to develop relations for the stress and internal energy behind the shock; stress increased with relative density and particle velocity and internal energy per unit mass converged to a curve similar to bulk AM SS316L. Explicit finite element analysis using the Johnson-Cook constitutive model demonstrated similar shock behavior observed in experiments. A linear shock velocity-particle velocity relation and corresponding Hugoniot calculations agreed with experimental results. |
Monday, July 11, 2022 11:15AM - 11:30AM |
C05.00002: Shock response of an additively manufactured high solids loaded polymer composite with intentional porosity Karla B Wagner, Gregory B Kennedy, Didier Montaigne, Brian J Jensen, Min Zhou, Naresh N Thadhani The performance of additively manufactured (AM) composites subjected to dynamic loading can be significantly influenced by process-inherent heterogeneities such as non-uniform constituent distribution, interfaces, and porosities. In this work, temporally- and spatially-resolved measurements of macro-, micro-, and meso-scale heterogeneities were performed to investigate the shock response of AM-fabricated high-solids-loaded polymer composite. Samples with pre-identified heterogeneities in the form of pores were impacted in different orientations relative to the print direction of the filaments. X-ray phase contrast imaging (PCI) was used to study the void collapse process upon interaction with the shock wave front(s) and determine the shock and particle velocities via feature tracking. Also investigated were features such as shock front tilt, presence/creation of additional wave fronts, and shifts in shock velocity relative to its proximity to the porosity. Photon Doppler velocimetry (PDV) was simultaneously used to measure the sample free surface velocity and determine the effects of local directional porosity on the equation of state, which in our previous work was found to be independent of orientation effects in a similar material with more uniform distribution of pores. |
Monday, July 11, 2022 11:30AM - 11:45AM |
C05.00003: Quantifying 3D Particle and Pore Dynamics During Rapid Compaction of Rapid Granular Materials Ryan C Hurley, Sohanjit Ghosh, Adyota Gupta, Kaliat Ramesh, Mohmad M Thakur, Ryan S Crum, Chongpu Zhai We describe a new technique for inferring 3D particle and pore dynamics during rapid compaction of granular materials and its application to studying soda lime glass and aluminum powders impacted at velocities ranging from 0.7 km/s to 2.1 km/s. The technique for inferring 3D particle and pore dynamics involves performing an initial 3D characterization of the granular packing using x-ray computed tomography and then applying an optimization algorithm that updates the displacements and strains of individual particles by comparing synthetic x-ray phase contrast images with in-situ images. Impact experiments and imaging were performed at the Dynamic Compression Sector (DCS) of the Advanced Photon Source (APS) using a powder gun and four PI-MAX cameras. The scientific objective of the experiments was to identify the distribution of porosity in the granular medium as velocities increase from the quasi-static regime, in which particles only partially plastically deform, to the dynamic regime, in which particles significantly deform, flow, and melt. We describe prior work in which the method was validated using finite element simulations and future work investigating the role of particle material and morphology on pore collapse across the quasi-static to dynamic transition. |
Monday, July 11, 2022 11:45AM - 12:00PM |
C05.00004: Shock State Distributions in Porous Tantalum Using Multipoint PDV Nathan W Moore, Chad A McCoy, James B Carleton, Daniel K Frayer, Morris Kaufman, Sheri L Payne Heterogenous materials under shock compression can be expected to reach different shock states throughout the material according to local differences in microstructure. Here, a compact, multiple-beam focusing optic assembly is used with Photonic Doppler Velocimetry (PDV) to interrogate the shock response of porous tantalum films following plate impact. The spatial distribution of particle velocity is compared to results obtained using a set of defocused PDV beams. Both methods measure velocity distributions with the same average but different variance. Comparison to mesoscopically-resolved, hydrodynamics simulations shows that the focused PDV array more accurately measures the velocity distribution arising from the pore structure. |
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