High-throughput quantification of quasistatic, dynamic and spall strength of materials across 10 orders of strain rates

Suhas Eswarappa Prameela; Christopher C Walker; Christopher S DiMarco; Debjoy D Mallick; Xingsheng Sun; Stephanie Hernandez; Taisuke Sasaki; Justin W Wilkerson; K T Ramesh; George M Pharr; Timothy P Weihs

doi:10.1093/pnasnexus/pgae148

Article High-throughput quantification of quasistatic, dynamic and spall strength of materials across 10 orders of strain rates

Suhas Eswarappa Prameela ; Christopher C Walker ; Christopher S DiMarco ; Debjoy D Mallick ; Xingsheng Sun ; Stephanie Hernandez ; Taisuke Sasaki (National Institute for Materials Science) ; Justin W Wilkerson ; K T Ramesh ; George M Pharr ; Timothy P Weihs

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Suhas Eswarappa Prameela, Christopher C Walker, Christopher S DiMarco, Debjoy D Mallick, Xingsheng Sun, Stephanie Hernandez, Taisuke Sasaki, Justin W Wilkerson, K T Ramesh, George M Pharr, Timothy P Weihs. High-throughput quantification of quasistatic, dynamic and spall strength of materials across 10 orders of strain rates. PNAS Nexus. 2024, 3 (5), pgae148. https://doi.org/10.1093/pnasnexus/pgae148

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In this work, we combine two powerful small-scale testing methods, custom nanoindentation, and laser-driven microflyer (LDMF) shock, to measure the dynamic and spall strength of metals. The nanoindentation system is configured to test samples from quasistatic to dynamic strain-rate regimes. The LDMF shock system can test samples through impact loading, triggering spall failure. The model material used for testing is magnesium alloys, which are lightweight, possess high-specific strengths, and have historically been challenging to design and strengthen due to their mechanical anisotropy. We adopt two distinct microstructures, solutionized (no precipitates) and peak-aged (with precipitates) to demonstrate interesting upticks in strain-rate sensitivity and evolution of dynamic strength. At high shock-loading rates, we unravel an interesting paradigm where the spall strength vs. strain rate of these materials converges, but the failure mechanisms are markedly different. Peak aging, considered to be a standard method to strengthen metallic alloys, causes catastrophic failure, faring much worse than solutionized alloys.

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Creative Commons BY Attribution 4.0 International

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

Keyword: magnesium alloy, high-throughput, strain rate, dynamic behavior

Date published: 2024-04-30

Publisher: Oxford University Press (OUP)

Journal:

PNAS Nexus (ISSN: 27526542) vol. 3 issue. 5 pgae148

Funding:

Army Research Laboratory W911NF-12-2-0022 and W911NF-22-2-0014
National Nuclear Security Administration DE-NA0003857

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1093/pnasnexus/pgae148

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Updated at: 2024-11-19 16:31:12 +0900

Published on MDR: 2024-11-19 16:31:12 +0900

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