Dynamic Strength of Iron at High Pressures and Strain Rates

Gandhi, Vatsa; Ravindran, Suraj; Ravichandran, Guruswami

doi:10.1103/physrevlett.128.015705

Title: Dynamic Strength of Iron at High Pressures and Strain Rates

Journal Article · 06 January 2022 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.128.015705 · OSTI ID:1899357

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California Institute of Technology (CalTech), Pasadena, CA (United States); Institute for Shock Physics, Washington State University
California Institute of Technology (CalTech), Pasadena, CA (United States)

Accurate modeling of meteorite impacts, and deformation of planetary cores require characterization of the flow strength and in-elasticity of iron in its different phases. In this letter, we investigate the flow strength of both the ambient α-phase and high-pressure ϵ-phase of iron at strain-rates of 1 × 10⁵ s^–1 and pressures up to 42 GPa using high pressure - pressure shear plate impact experiments. We report the strength of the ϵ-iron to be significantly higher than α-phase but consequently one order smaller than the previously reported dynamic strength at high pressures. As a result, the complete stress-strain response of the ϵ-phase is reported for the first time.

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Research Organization:: Washington State Univ., Pullman, WA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)

Grant/Contract Number:: NA0003957

OSTI ID:: 1899357

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 128; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Dynamic Strength of Iron at High Pressures and Strain Rates

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