About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Mechanics at the Extremes: Bridging Length-Scales From Nanoscale to Bulk
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| Presentation Title |
Exploring Strength Upturn: Advancements in High Strain Rate Nanoindentation |
| Author(s) |
Rajaprakash Ramachandramoorthy |
| On-Site Speaker (Planned) |
Rajaprakash Ramachandramoorthy |
| Abstract Scope |
The strength upturn phenomenon - a sharp rise in flow stress at strain rates above ~1000/s - critically affects material performance in crash dynamics and high-speed manufacturing. Despite its importance, existing individual mechanical testing methods cannot span the full strain rate range (10–100000/s) where this upturn occurs, complicating the interpretation and post-deformation analysis.
In this presentation, our work on recent advancements in high strain rate nanoindentation instrumentation, which enables, for the first time, constant indentation strain rates of up to 100000/s, will be presented. The mechanical response of crystalline metals, intermetallics, and amorphous materials will be presented to reveal how the upturn manifests across different classes of materials, supported by detailed post-mortem characterization. Additionally, new developments and preliminary results on extending these techniques to simple stress states like uniaxial compression at similar high strain rates, and with cryogenic temperatures, to further probe the underlying material physics will be presented.
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| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, |