Bulletin of the American Physical Society
21st Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 64, Number 8
Sunday–Friday, June 16–21, 2019; Portland, Oregon
Session U3: AETD: Temperature Diagnostics 2 |
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Chair: Dan Dolan, SNL Room: Pavilion East |
Thursday, June 20, 2019 3:15PM - 3:30PM |
U3.00001: Microscale In-situ High-speed Imaging of Temperature and Deformation Fields Amirreza Keyhani, Yang Rong, Min Zhou A novel capability (MINTED, or microscale in-situ imaging of temperature and deformation fields under dynamic loading) for time-resolved and space-resolved measurements of the temperature and deformation fields at the microstructure level for dynamic conditions is developed. The system cohesively integrates a state-of-the-art high-speed infrared (IR) camera and a high-speed visible light (VL) camera in a Kolsky bar apparatus. To simultaneously capture deformation and temperature fields at normal incidence with joint microsecond time and micrometer scale spatial resolutions, the VL and IR emissions from the sample are separated by a dichroic beam splitter. The beam splitter reflects visible spectrum into the VL camera and transmits the IR spectrum into the IR camera. This is a general capability that can be used to study deformation, failure and heating in materials. To demonstrate the capabilities of the MINTED system, experiments were performed on sucrose granules, which are widely used as a simulant of energetic crystals. The deformation and temperature fields provide detailed first-time insight into the processes of fracture, friction, shear localization, and hotspot development in the microstructures. [Preview Abstract] |
Thursday, June 20, 2019 3:30PM - 3:45PM |
U3.00002: Raman Thermometry Measurements of Shocked Explosives Shawn McGrane, Tariq Aslam Shock temperature in high explosives is an important, but poorly constrained, parameter necessary for including temperature dependent reaction rates in reactive burn modeling. We used attenuated detonation waves to shock the explosives PBX 9501, PBX 9502, and nitromethane and nanosecond Stokes/anti-Stokes Raman thermometry to measure the shock temperatures. Velocimetry was used to characterize the shock states. We will report on the methods, experimental results, and comparison to theoretical predictions. We will also detail efforts to obtain spatially resolved shock temperatures with line imaging. [Preview Abstract] |
Thursday, June 20, 2019 3:45PM - 4:00PM |
U3.00003: Influence of Temperature Effects on the Dynamic Tensile Extrusion of Molybdenum Carl Trujillo, George Gray III, Michael Burkett, Ellen Cerreta, Daniel Martinez, Veronica Livescu The Dynamic Tensile Extrusion experimental technique was developed at Los Alamos National Laboratory (LANL) to evaluate tensile response of materials when subjected to large plastic strains at elevated strain rates. Using this technique, molybdenum specimens were accelerated up to 550 m/s and at temperatures of 21\textdegree C and 275\textdegree C before extrusion through a high strength die and recovered. A combination of in-situ diagnostics including: High Speed Imaging, Photon Doppler Velocimetry (PDV) and High-Speed Infrared Camera, were used to capture dynamic extruded material topologies, extrusion velocity history and specimen surface temperature. Post mortem microscopy measurements were used to compare the original and extruded material microstructures to assess the deformation process and the plastic strains realized during the process. Experimental data was used to validate hydrocode strength and damage evolution models. Post-test metallography characterized the plastic instabilities resulting in particulation and damage evolution during the dynamic tensile extrusion process. Quantitative examination of the influence of temperature, texture, and extrusion velocity will be presented. . [Preview Abstract] |
Thursday, June 20, 2019 4:00PM - 4:15PM |
U3.00004: Debye-Waller Temperature Measurement of Shock Compressed Solids Andrew Higginbotham, Ashley Poole, Andrew Comley, Emma Floyd, John Foster, Caroline Lumsdon, David McGonegle, Anthony Meadowcroft, Steve Rothman, Justin Wark The accurate measurement of temperature during laser compression of solids remains a significant barrier to full determination of material response during high strain-rate deformation. Given the importance of such experiments in fields as diverse as physics, inertial confinement fusion efforts, and the search for new metastable materials, a solution to this elusive element of equation of state is increasingly pressing. This is compounded by the ever-increasing body of work which makes use of off-Hugoniot compression to reach novel states as the Rankine-Hugoniot relations can no longer be relied upon to constrain P-T conditions. We present work conducted on the UK’s Orion laser aimed at investigating the potential for utilising the Debye-Waller effect present in x-ray diffraction signals to infer temperature. This approach has the advantage that it is fully complementary to existing structural diagnostics, simply making use of hitherto (often) neglected intensity information within the pattern. We will show experimental results and supporting molecular dynamics simulations and discuss the potential for this technique to be employed more widely in laser plasma and free electron laser environments. [Preview Abstract] |
Thursday, June 20, 2019 4:15PM - 4:30PM |
U3.00005: Temperature measurements to complete equations of state Minta Akin, Ryan Crum, Yekaterina Opachich, Eric Dutra, David Brantley, Dawn Graninger, Markus Daene, Philip Myint, Ricky Chau We report on progress toward obtaining a complete equation of state for materials such as LiF, Sn, and Fe by determining bulk temperature under dynamic compression. This effort uses simultaneous radiance and reflectance measurements using streak spectroscopy and optical pyrometry, coupled with advanced models of heat transport at high pressure. T is determined through comparison of reflected and emitted light, enabling an emissivity-corrected graybody emission calculation of interface temperatures evolving in time. Simulations are used to determine the relative sensitivity of temperature gradients within and across materials, the effects of poorly constrained temperature and thermal diffusivity values in equation of state models, and the effects of release wave propagation upon the interface and heat transport measurements. [Preview Abstract] |
Thursday, June 20, 2019 4:30PM - 4:45PM |
U3.00006: ABSTRACT WITHDRAWN |
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