Bulletin of the American Physical Society
19th Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 60, Number 8
Sunday–Friday, June 14–19, 2015; Tampa, Florida
Session V6: Particulate, Porous and Composite Materials VI |
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Chair: Mukul Kumar, Lawrence Livermore National Laboratory, Leora Cooper, Massachusetts Institute of Technology Room: 8/9/10 |
Thursday, June 18, 2015 3:45PM - 4:00PM |
V6.00001: (U) Influence of Initial Density on the Shock Densification Response of CeO2 David Fredenburg, Robert Scharff, Eric Chisolm The effect of initial density on the shock densification of CeO2 powder is investigated. Specifically, the compaction response of CeO2 at initial porous densities of 4.0 and 2.3 g/cm3, corresponding to 55 and 33 percent of the theoretical crystal density are examined. The compression data is then correlated to an equation of state and strength-based P-alpha compaction model to determine the applicability of the model to porous CeO2. [Preview Abstract] |
Thursday, June 18, 2015 4:00PM - 4:15PM |
V6.00002: Comparison of Models for Shock Compaction of Porous Cerium Oxide Mark Short, Anthony Fredenburg Continuum engineering models are often used to describe the shock compaction of porous materials. These range in complexity and include snowplow, p-alpha and multi-phase continuum models. We will discuss the relative performance of various compaction models in a series of one- and two-dimensional validation tests that involve high explosive drive of porous cerium oxide. [Preview Abstract] |
Thursday, June 18, 2015 4:15PM - 4:30PM |
V6.00003: Dynamic Compaction of Yttria-Stabilized Zirconia with the addition of Carbon Nanotubes Peter Sable, John Borg, Jeff LaJeunesse, Merit Schumaker, Greg Kennedy, Naresh Thadhani Yttria-stabilized zirconia (YSZ) is a versatile ceramic utilized for its hardness as well as thermal stability. In these experiments, carbon nanotubes (3{\%} and 5{\%} by weight) were added to powdered YSZ before it was statically compacted. These compacted samples were then dynamically compressed and monitored using a Photon Doppler Velocimetry (PDV) system. The objective was to better develop an understanding of how CNT affects the initial shock response of the powder system. Experiments indicate the CNT both steepen the rise and increase the Hugoniot state of the YSZ-CNT system as compared to YSZ alone. Additionally, the PDV data is in good agreement with simple hydrocode simulations. The results of experiments and simulations are discussed. [Preview Abstract] |
Thursday, June 18, 2015 4:30PM - 4:45PM |
V6.00004: Dynamics of laser ablative shock waves from one dimensional periodic structured surfaces Prem Kiran Paturi, Leela Chelikani, Venkateshwarlu Pinnoju Spatio-temporal evolution of Laser ablative shock waves (LASWs) from one dimensional periodic structured surfaces (1D-PSS) of Aluminum is studied using time resolved defocused shadowgraphy technique. LASWs are generated by focusing 7 ns pulses from second harmonic of Nd:YAG (532 nm, 10 Hz) laser on to 1D-PSS with sinusoidal and triangular modulations of varying periodicity. An expanded He-Ne laser (632.8nm) is used as probe beam for shadowgraphy. Evolution of ablative shock front (SF) with 1.5 ns temporal resolution is used to measure position of the SF, its nature, density and pressure behind the SF. The effect of surface modulation on the LASW and contact front dynamics was compared to those from a flat surface (FS) of Aluminum. SWs from FS and PSS obeyed Taylor's solution for spherical and planar nature, respectively. The velocity of SF from 1D PSS had a twofold increase compared to the FS. This was further enhanced for structures whose periodicity is of the order of excitation wavelength. Variation of SF properties with varying periodicity over a range of 3.3 $\mu $m to 0.55 $\mu $m has the potential to tailor shockwaves of required parameters. [Preview Abstract] |
Thursday, June 18, 2015 4:45PM - 5:15PM |
V6.00005: The Stress and Ballistic Properties of Granular Materials Invited Speaker: William Proud Granular materials are widespread in nature and in manufacturing. Their particulate nature gives them compressive strength of a similar order of magnitude as many continuous solids, while also giving a vanishing small tensile strength and a variable shear strength which is highly dependent on loading conditions. Previous studies have shown the effect of composition, morphology and particle size. However, compared to metals and polymers, granular materials are not so well characterised or understood. The talk will present some recent results in this study of granular materials and show how these studies fit within the wider context of this area. In particular studies which examine the changes in stress transmission and ballistic response will be emphasized. [Preview Abstract] |
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