Bulletin of the American Physical Society
20th Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 62, Number 9
Sunday–Friday, July 9–14, 2017; St. Louis, Missouri
Session O7: Materials III: Properties |
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Chair: Thomas Mattsson, Sandia National Laboratories Room: Regency Ballroom F |
Wednesday, July 12, 2017 9:15AM - 9:30AM |
O7.00001: The Tri-lab Tantalum Strength Consortium Dawn G. Flicker, Thomas A. Arsenlis, Ryan Austin, Nathan R. Barton, John F. Benage, Curt A. Bronkhorst, Justin L. Brown, Staci L. Brown, William T. Buttler, Shuh-Rong Shen, Dana M. Dattelbaum, Sayu J. Fensin, George T. III Gray, J. Matthew D. Lane, Hojun Lim, D.J. Luscher, Thomas R. Mattsson, Dennis P. McNabb, Bruce A. Remington, Hye-Sook Park, Shon T. Prisbrey, Michael B. Prime, Robert J. Scharff, Mark W. Schraad, Amy C. Sun A Tri-lab consortium of experimentalists and theorists at SNL, LLNL, and LANL is joining forces to better understand tantalum strength across an unprecedented range of loading conditions. The team is collecting and comparing tantalum strength data from Hopkinson bar, Taylor cylinder, guns, Z, Omega and the NIF. These experiments, all using Ta from a single lot, span pressures from tenths to hundreds of GPa and strain rates from $10^3$ to $10^7$. New experiments are underway to provide more overlap between the platforms. The experiments are being simulated with a variety of models in order to determine which processes are important under which conditions. The presentation will show results to date. [Preview Abstract] |
Wednesday, July 12, 2017 9:30AM - 9:45AM |
O7.00002: Structure / Property (Constitutive and Dynamic Strength / Damage) Characterization of Additively Manufactured (AM) Tantalum George Gray III, Veronica Livescu, Cameron Knapp, Carl Trujillo, Roberta Beal, David Jones Certification requirements generally involve meeting engineering and physics requirements tied to the functional requirements of the engineering component and finally process and product qualification. In this presentation, the results of a study quantifying the constitutive behavior of Tantalum (Ta) fabricated using an EOS laser-powder-bed machine is presented. The microstructure of the AM-Ta is detailed and compared / contrast to wrought Ta. The mechanical behavior of the AM build methods was characterized using compression testing as a function of strain rate. The dynamic damage evolution and failure response of the AM-Ta material, as well as wrought Ta, was probed using flyer-plate impact driven spallation experiments. The damage evolution of the AM and wrought Ta were characterized using optical metallography and electron-back-scatter diffraction (EBSD). [Preview Abstract] |
Wednesday, July 12, 2017 9:45AM - 10:00AM |
O7.00003: Constitutive Behavior Modelling of AA1100-O AT Large Strain and High Strain Rates. Gabriel Testa, Gianluca Iannitti, Andrew Ruggiero, Domenico Gentile, Nicola Bonora Constitutive behavior of AA1100-O, provided as extruded bar, was investigated. Microscopic observation showed that the cross-section has a peculiar microstructure consisting in the inner core with a large grain size surrounded by an external annulus with finer grains. Low and high strain rates tensile tests were carried out at different temperature ranging from -190\,$^{\circ}$C to 100\,$^{\circ}$C. Constitutive behavior was modelled using a modified version of Rusinek {\&} Klepaczko model. Parameters were calibrated on tensile test results. Tests and numerical simulations of symmetric Taylor (RoR) and dynamic tensile extrusion (DTE) tests at different impact velocities were carried out in order to validate the model under complex deformation paths. [Preview Abstract] |
Wednesday, July 12, 2017 10:00AM - 10:15AM |
O7.00004: Studying dynamic flow stress of lead at high pressure and high strain rates on NIF Philip D. Powell, Channing M. Huntington, Andrew G. Krygier, James M. McNaney, Robert E. Rudd, Hye-Sook Park, Shon Prisbrey, Damian C. Swift, A. Arsenlis, Peter Graham, Andrew Comley, Steve Rothman Material plastic flow stress is expected to be influenced when a material's loading path causes a phase change in the solid from one crystal structure to another. In this study we investigate the dynamic strength of lead (Pb) at high pressure ($\sim 3.5$Mbar) and high strain rates ($\sim 10^{7}$s$^{\mathrm{-1}})$ through Rayleigh-Taylor instability measurements on NIF. We employ a special ramp drive to a very low density foam reservoir in order to avoid sample melting during the initial pressure loading. In addition, target ripple patterns are designed to allow for differentiation of various Pb strength models, even when accounting for current uncertainties in model parameters. Finally, we develop a new Pb strength model to account for its change from the fcc phase at ambient conditions to the bcc phase at high pressures. In this talk, we present the design and initial results of our Pb strength experiments on NIF. [Preview Abstract] |
Wednesday, July 12, 2017 10:15AM - 10:45AM |
O7.00005: The Science of Cost-Effective Materials Design -- A Study in the Development of a High Strength, Impact Resistant Steel. Invited Speaker: Rachel Abrahams Intermediate alloy steels are widely used in applications where both high strength and toughness are required for extreme/dynamic loading environments. Steels containing greater than 10{\%} Ni-Co-Mo are amongst the highest strength martensitic steels, due to their high levels of solution strengthening, and preservation of toughness through nano-scaled secondary hardening, semi-coherent hcp-M$_{\mathrm{2}}$C carbides. While these steels have high yield strengths ($\sigma_{\mathrm{y0.2\% }}$ \textgreater 1200MPa) with high impact toughness values (CVN@-40 \textgreater 30J), they are often cost-prohibitive due to the material and processing cost of nickel and cobalt. Early stage-I steels such as ES-1 (Eglin Steel) were developed in response to the high cost of nickel-cobalt steels and performed well in extreme shock environments due to the presence of analogous nano-scaled hcp-Fe$_{\mathrm{2.4}}$C epsilon carbides. Unfortunately, the persistence of W-bearing carbides limited the use of ES-1 to relatively thin sections. In this study, we discuss the background and accelerated development cycle of AF96, an alternative Cr-Mo-Ni-Si stage-I temper steel using low-cost heuristic and Integrated Computational Materials Engineering (ICME)-assisted methods. The microstructure of AF96 was tailored to mimic that of ES-1, while reducing stability of detrimental phases and improving ease of processing in industrial environments. AF96 is amenable to casting and forging, deeply hardenable, and scalable to 100,000kg melt quantities. When produced at the industrial scale, it was found that AF96 exhibits near-statistically identical mechanical properties to ES-1 at 50{\%} of the cost. [Preview Abstract] |
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