Bulletin of the American Physical Society
2005 14th APS Topical Conference on Shock Compression of Condensed Matter
Sunday–Friday, July 31–August 5 2005; Baltimore, MD
Session U2: Equation of State V |
Hide Abstracts |
Chair: Jow Ding, Washington State University Room: Hyatt Regency Constellation C |
Thursday, August 4, 2005 3:00PM - 3:15PM |
U2.00001: Equations-of-State and Shock Response of Fluorinated Polymers: Influence of Polymer Crystallinity Dana Dattelbaum, David Robbins, Stephen Sheffield, Edward Orler, Rick Alcon, David Stahl Fluoropolymers find wide application in a variety of fields due to their chemical inertness, low coefficient of friction, and ability to withstand high-temperature operating conditions. The presence of fluorine in the polymer backbone, coupled with the propensity of these polymers to adopt linear chains, often result in the presence of complex, multi-phase crystalline structures. We will examine the influence of the degree of crystallinity, and nature of crystalline phase on both static compressive and shock loaded polymer behavior in poly(tetrafluoroethylene) (PTFE), poly(chlorotrifluoroethylene), and poly(chlorotrifluoroethylene-\textit{co}-vinylidene fluoride). The most widely used fluorocarbon polymer for engineering applications is poly(tetrafluoroethylene) (PTFE). PTFE exists in at least four known crystalline phases near room temperature and ambient pressure. Replacing one of the fluorines in the chemical backbone with chlorine results in a polymer with substantially different properties, poly(chlorotrifluoroethylene) or Kel-F 81. The third, related polymer that will be discussed is the high explosive binder, poly(chlorotrifluoroethylene-\textit{co}-vinylidene fluoride) (Kel-F 800) that is used in PBX-9502 formulations. Accompanying static high-pressure diamond anvil cell work will also be presented and compared to dynamic results. [Preview Abstract] |
Thursday, August 4, 2005 3:15PM - 3:30PM |
U2.00002: Response to Unloading and Reloading of Shock Compressed Polymethyl Methacrylate W.D. Reinhart, L.C. Chhabildas Shock properties of polymeric materials have been investigated at low stresses for use as windows for velocity interferometry, binder phases for polymer-bonded explosives, and as adhesives. The shock hugoniot for many polymeric materials also exist. There are distinct advantages in using a low-impedance polymer for impactors on shock experiments, however the loading structure from reshock or release has not been determined. In this study polymethyl-methacrylate (PMMA) is shocked to 45 GPa and recompressed to nearly 100 GPa as well as unloaded from the shocked state. Reloading and unloading wave speeds have been determined from this stress levels. The results from these tests not only will characterize PMMA at these stress states, but will be valuable when PMMA is used to study strength and phase transformation behavior in other materials. *Sandia is a mulitprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy National Nuclear Security Administration under contract DE-AC04-94AL8500. [Preview Abstract] |
Thursday, August 4, 2005 3:30PM - 3:45PM |
U2.00003: Shock Compression in Organic Liquids Glenn Garrett, Lalit Chhabildas, William Reinhart No comprehensive mechanistic study of the shock compression behavior of liquids currently exists. Consequently, the behavior trends of shock compressed liquids has been investigated. This paper reviews the literature data available on a variety of liquids. However, this study will focus on the literature data available on hydrocarbon liquids, CxHy. The results of this analysis will correlate the compressibility of the hydrocarbon to its bonding structure (ring vs straight chain) as well as the length of straight chains for the hydrocarbons. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration ~under contract DE-AC04-94AL85000. [Preview Abstract] |
Thursday, August 4, 2005 3:45PM - 4:00PM |
U2.00004: A Complete Equation of State for Graphite-Diamond-Liquid Carbon Eric Auroux, Olivier Heuze Many issues remain unknown about the state of carbon in detonation products, especially if it is in graphite, diamond structure or liquid or a mixture of these different phases. We propose a complete equation of state for graphite/diamond/liquid carbon based on the fundamental rules of thermodynamic equilibrium. Each phase is defined independently, the phase transition lines are obtained from the Gibbs free energy equality and provide true volume and entropy jumps, and a full description of the thermodynamic properties of binary mixtures and at the triple point. This approach, already used for other materials like Sn or Bi, is newly applied to carbon. It is particularly suited to be used with a gaseous phase to calculate the equilibrium properties of detonation products. Our model is based on classical cold/thermal contributions and heat capacities, and Gr\"{u}neisen assumption. An electronic contribution is useful at high temperature. It reproduces well the experimental transition lines, triple point, and Hugoniot curve. We compare our model to Van Thiel {\&} Ree's model, especially in the neighborhood of the mixted states where they use the Lindemann law and pressure jump. We make this comparison on the basis of very similar physical parameters and show the consequences on the properties of the phase transition. [Preview Abstract] |
Thursday, August 4, 2005 4:00PM - 4:15PM |
U2.00005: Shock Hugoniot compression data for several bio-related materials Kunihito Nagayama, Yasuhito Mori, Yasuhiro Motegi, Motonao Nakahara We have obtained shock Hugoniot compression data for several kinds of bio-related materials up to 1 GPa shock pressure. Materials include pure water, NaCl aqueous solution, gelatine with two different concentrations, and chicken breast meat. Plane shock wave has been induced in these samples by using compressed gas gun. Optical sensitive detection of shock arrival was realized by inclined prism technique developed by our group. Target assembly consists of PMMA driver plate, and each sample was inserted into PMMA-plate container. Most of the experiments have been performed in the symmetric impact condition, i.e., both driver and flyer plate are PMMA. By using impedance mismatching method, shock Hugoniot data has been deduced from the high speed streak camera record. Shock-particle velocity Hugoniot for all the samples are found to summarize as a linear relationship. Furthermore, slope of the relationship is about 2 for all the ssamples. First precise Hugoniot data for biological materials, in this case, chiken meat is found to be in harmony with the other Hugoniot data for the material whose shock impedance is close to living tissues. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700