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Ramp-release experiments for strength measurements: Strain-rate dependence

Floyd, Emma [AWE plc, Reading (United Kingdom)] (ORCID:0000000162574905)·Eggert, Jon H. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000157307108)·McGuire, Christopher McGuire P. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000154824978)·Volz, Travis J. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000182249368)·Smith, Raymond F. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000256755731)·Celliers, Peter M. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000176001227)·McNaney, James M. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000335269379)·Fratanduono, Dayne E. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000302483627)·Gorman, Martin G. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000195676166)·Briggs, Richard [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000345885802)·Brown, Justin L. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)] (ORCID:0000000304408719)·Rothman, Steve D. [AWE plc, Reading (United Kingdom)] (ORCID:0000000288708921)·Ali, Suzanne J. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000318233788)
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Abstract

This paper presents an enhanced analysis method for investigating material properties at high strain rates, extending the capability of established experimental techniques to gain more information. The ramp-release method has been applied to many experiments reported at high (≈10 5 − 10 6 s −1 ) strain-rates. More recent data gathered at the National Ignition Facility (NIF) has enabled higher (≈10 8 s −1 ) strain-rates to be studied. Here, we present an initial application of ramp-release analysis to NIF ramp-compression data, illustrating both the opportunities and the practical challenges of extending these methods to laser-driven platforms. The higher strain-rates accessed at the NIF mean that there is more strain-rate enhancement to strength, and the experimental configuration means that this enhancement is more readily seen in the data. This is enabled by the capability of avoiding peak-compression attenuation through the sample thickness with a designed hold period made possible by the pulse-shaping capability of NIF. We propose that this combination of experimental conditions and an enhanced analysis method enables the strain-rate enhancement to strength to be studied, and potentially for this to inform physics models at smaller scales than the continuum.

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Floyd, Emma [AWE plc, Reading (United Kingdom)] (ORCID:0000000162574905), Eggert, Jon H. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000157307108), McGuire, Christopher McGuire P. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000154824978), Volz, Travis J. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000182249368), Smith, Raymond F. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000256755731), Celliers, Peter M. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000176001227), McNaney, James M. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000335269379), Fratanduono, Dayne E. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000302483627), Gorman, Martin G. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000195676166), Briggs, Richard [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000345885802), Brown, Justin L. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)] (ORCID:0000000304408719), Rothman, Steve D. [AWE plc, Reading (United Kingdom)] (ORCID:0000000288708921), Ali, Suzanne J. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000318233788). 2026-05-12. Ramp-release experiments for strength measurements: Strain-rate dependence. https://doi.org/10.1063/5.0325594

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