High Strain Rate Metal Plasticity

Lea, Lewis; Walley, S. M.

doi:10.1007/978-3-662-53605-6_219-1

Encyclopedia of Continuum Mechanics 2018

DOI: 10.1007/978-3-662-53605-6_219-1

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High Strain Rate Metal Plasticity

Lewis Lea

S. M. Walley

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2020

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“…However, at strain rates of about 10 4 s −1 there is an abrupt change 2,3 , above which the material strength rises around 100 times more quickly. Despite originally being observed in 1984 2 , the physical nature of the transition remains controversial [3][4][5] . Studies of the effect have been limited by a lack of experimental data above the transition which can separate instantaneous strength contributions 2,[5][6][7] (e.g., due to viscous effects or phonon drag) from structural strength contributions 1,5,8 (e.g., due to changes in dislocation structure).…”

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

2020

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Plastic deformation is a fundamentally important physical process, ultimately determining how materials can be used. Metal plasticity is governed by dislocation dynamics and lattice twinning. Although many continuum constitutive models exist, plasticity is now known to occur in discrete events arising from the self-organisation of dislocations into ‘avalanches’ under applied stress. Here we extend avalanche plasticity to high strain rates, by introducing time limitation to self-organisation. At high rates large avalanches fail to form; the system must self-organise around new constraints. Various macroscopic consequences include an increasing rate of work hardening with strain rate. We perform new measurements on high purity copper that distinguish between instantaneous and permanent strength contributions across a strength transition at 104 s−1, showing the transition to be a change in structural evolution. Strong model agreement validates our time limited self-organisation approach. Our work results in a unified, physically realistic framework for plasticity, with wide applicability.

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

2020

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High Strain Rate Metal Plasticity

Cited by 1 publication

References 113 publications

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

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

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