Half-hard copper PTW model parameters for plastic deformation calibrated to strain rates from 10⁻³ -10⁷/s

Technical Report · Mon Dec 11 04:00:00 EST 2023

DOI:https://doi.org/10.2172/2229657· OSTI ID:2229657

Sjue, Sky K. ^[1]

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1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

This document demonstrates a calibration of the Preston-Tonks-Wallace (PTW) model of plastic deformation that fairly accurately reproduces the flow stress of half-hard copper across strain rates varying by a factor of more than ten billion. The experiments included are quasistatic compression at low rates, Split Hopkinson Pressure Bar (SHPB) compression at intermediate rates, and arrested Richtmyer-Meshkov instability (RMI) growth at high strain rates. The temperatures vary from liquid nitrogen (77 K) to around 500 K. The largest true strains obtained are approximately 0.5. It would be interesting to compare the results to copper deformation data at higher pressures and higher strains.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: 89233218CNA000001
• OSTI ID: 2229657
• Report Number(s): LA-UR--23-33651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE