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Further Development of the Tamped Richtmyer-Meshkov Instability Method and Application to Molybdenum Dynamic Strength Calibration and Tabulation

Journal Article · · Journal of Dynamic Behavior of Materials
 [1];  [2];  [3];  [4];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States); Texas A & M Univ., College Station, TX (United States)
  3. Georgia Institute of Technology, Atlanta, GA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
The high pressure and high strain rate dynamic strength of Mo is experimentally and computationally investigated in the 3–20 GPa stress, 50–600 C temperature, and 105–106 /s strain rate regimes using a modified tamped Richtmyer-Meshkov instability (RMI) method. Modifications to the tamped RMI method include a method to determine loading states during strain, a new strength calibration function based on interface shape, and a robust uncertainty quantification method. These modifications improve fidelity of the tamped RMI method, allowing evaluation of the compensating effects of pressure hardening, strain rate hardening, strain hardening, and thermal softening. The new calibration function based on interface shape is not limited to sinusoidal corrugations and could be applied to additional interface shapes. Plate impact experiments are performed at Argonne National Laboratory’s Advanced Photon Source’s Dynamic Compression Sector operated by Washington State University (DCS), driving a planar shock front through a corrugated Mo-D2O or Mo-C8F18 interface, forcing the corrugation to significantly deform. The extent of interfacial deformation, RMI growth, is experimentally observed using X-ray phase contrast imaging at the DCS. RMI jet lengths and jet shapes are extracted from the experimental radiographs, then used to calibrate numerical simulations performed with the Sandia National Laboratories (SNL) hydrocode CTH. Mo yield strength, Y, as a function of shock pressure, P, strain rate, $$\dot{\varepsilon }$$, accumulated strain, ϵ, relative volumetric compression, RD, and temperature, T, is determined for each impact experiment and presented. The calibrated Mo yield strength values range 1.2–1.8 GPa, with strength generally decreasing as the impact stress increases. This trend is likely caused by thermal softening or strain localization. The tabular yield strength versus loading condition data presented in this paper can be used to fit complex strength models.
Research Organization:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States); Washington State Univ., Pullman, WA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
AC02-06CH11357; NA0003525; NA0003957
OSTI ID:
3020550
Journal Information:
Journal of Dynamic Behavior of Materials, Journal Name: Journal of Dynamic Behavior of Materials; ISSN 2199-7454; ISSN 2199-7446
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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  • Guo, Shuyue; Voorhees, Travis; Sapp, Adam
  • 23rd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter - Chicago, Illinois, United States of America - June - 2023 https://doi.org/10.2172/2430932
conference June 2023

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