Bulletin of the American Physical Society
18th Biennial Intl. Conference of the APS Topical Group on Shock Compression of Condensed Matter held in conjunction with the 24th Biennial Intl. Conference of the Intl. Association for the Advancement of High Pressure Science and Technology (AIRAPT)
Volume 58, Number 7
Sunday–Friday, July 7–12, 2013; Seattle, Washington
Session Z6: ME.2 Composites and Polymers II |
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Chair: Rick Gustavsen, Los Alamos National Laboratory Room: Cascade II |
Friday, July 12, 2013 11:00AM - 11:15AM |
Z6.00001: High-density Polyethylene Damage at Extreme Tensile Conditions Eric Brown, Jevan Furmanski, Kyle Ramos, Dana Dattelbaum, Brian Jensen, Adam Iverson, Carl Carlson, Kamel Fezzaa, Carl Trujillo, Daniel Martinez, George Gray, Brian Patterson In situ and post mortem observations of the dynamic tensile failure and damage evolution of high-density polyethylene (HDPE) are made during Dynamic-Tensile-Extrusion (Dyn-Ten-Ext) loading. The Dyn-Ten-Ext technique probes the tensile response of materials at large strains (\textgreater 1) and high strain-rates (\textgreater 10,000/s) by firing projectiles through a conical die. Depending on the extrusion ratios and velocities, HDPE damage varies from gross deformation with substantial internal damage, to a stable jet with finite particulation, to catastrophic fragmentation. Postmortem sectioning elucidates a mechanism of internal damage inception and progression oblique to the extrusion axis. X-ray computed tomography corroborates a shear damage mechanism with an internal damage zone aligned with the extrusion axis. In situ measurements of damage are made with the impact system for ultrafast synchrotron experiments (IMPULSE) designed for using the advanced imaging and X-ray methods available at the Advanced Photon Source. Time resolved phase-contrast imaging elucidates the evolution of damage features during dynamic loading that is observed in post mortem sectioning and tomography. [Preview Abstract] |
Friday, July 12, 2013 11:15AM - 11:30AM |
Z6.00002: Shock Compression of Heterogeneous PMMA/Glass Particulate Composite Michael Rauls, Guruswami Ravichandran Understanding the transmission of shock waves in heterogeneous materials is of considerable interest in impact and blast applications. The structure and propagation of shock waves in heterogeneous solids is related to their microstructure and material properties. Shock wave experiments conducted on a model particulate composite consisting of glass spheres in a PMMA matrix are presented. The composite is prepared by a compression molding process to fuse PMMA powder with randomly distributed glass spheres. The specimens are subjected to normal plate impact using a powder gun at velocities in the range of 1 to 2 km/s. The particle velocity at the rear surface is measured using a VISAR or PDV system. The measured velocity profiles are examined in relation to the microstructure of the particulate composite. Exploration of the heterogeneity of the shock front is also explored using a multi-point velocity measurement system. The effect of sphere size and density on the propagation of shock waves in the model composite is discussed. [Preview Abstract] |
Friday, July 12, 2013 11:30AM - 11:45AM |
Z6.00003: Thin film metal thermistors with microsecond time response for shock temperature measurements of polymers Nicholas Taylor, David Williamson, Andrew Jardine Equations of state can be used to predict the relationship between pressure, volume and temperature. However, in shock physics, they are usually only constrained by experimental observations of pressure and volume. Direct observation of temperature in a shock is therefore valuable in constraining equations of state. Bloomquist and Sheffield (1980, 1981) and Rosenberg and Partom (1984) have attempted such observations in PMMA. However, their results disagree strongly above 2~GPa shock pressure. Here we present an improved fabrication technique, to examine this outstanding issue. We make use of the fact that the electrical resistivity of most metals is a known function of both pressure and temperature. If the change in resistance of a thin metal thermistor gauge is measured during a shock experiment of known pressure, the temperature can be calculated directly. The time response is limited by the time taken for the gauge to reach thermal equilibrium with the medium in which it is embedded. Gold gauges of thickness up to 200~nm have been produced by evaporation, and fully embedded in PMMA. These reach thermal equilibrium with the host material in under 1~$\mu$s, allowing temperature measurement within the duration of a plate impact experiment. [Preview Abstract] |
Friday, July 12, 2013 11:45AM - 12:15PM |
Z6.00004: Dynamic fragmentation in ductile materials / new theoretical meshfree method / multiscale modeling Invited Speaker: Michael Ortiz |
Friday, July 12, 2013 12:15PM - 12:30PM |
Z6.00005: ABSTRACT WITHDRAWN |
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