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Time limited self-organised criticality in the high rate deformation of face centred cubic metals

Engineering and Technology

Time limited self-organised criticality in the high rate deformation of face centred cubic metals

L. Lea, L. Brown, et al.

Discover groundbreaking research by Lewis Lea, Lawrence Brown, and Andrew Jardine at The Cavendish Laboratory, as they unveil the intricacies of high strain rate plasticity in FCC metals. Their innovative approach connects structural changes in strength with avalanche plasticity theory, reshaping our understanding of material behavior at extreme rates.

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Playback language: English
Abstract
This paper investigates the high strain rate plasticity of face-centered cubic (FCC) metals, focusing on a strength transition around 10⁴ s⁻¹. The authors extend avalanche plasticity theory to high strain rates by introducing time limitations to self-organisation. Experiments on high-purity copper distinguish instantaneous and permanent strength contributions, demonstrating that the transition is structural in nature. A model linking changes in mechanical threshold to the inability of large avalanches to form rapidly is validated by strong model agreement with experimental data. The work provides a unified framework for plasticity.
Publisher
Communications Materials
Published On
Dec 01, 2020
Authors
Lewis Lea, Lawrence Brown, Andrew Jardine
Tags
high strain rate plasticity
face-centered cubic metals
avalanche plasticity theory
instantaneous strength
structural transition
mechanical threshold

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