Author
Thomson, S
Howell, P
Ockendon, J
Ockendon, H
Journal title
AIP Conference Proceedings
DOI
10.1063/1.4971552
Volume
1793
Last updated
2022-07-31T19:35:55.69+01:00
Page
1-8
Abstract
Isentropic compression experiments (ICE) are a way of obtaining equation of state information for metals undergoing violent plastic deformation. In a typical experiment, millimetre thick metal samples are subjected to pressures on the order of 10 – 102 GPa, while the yield strength of the material can be as low as 10−2 GPa. The analysis of such experiments has so far neglected the effect of shear strength, instead treating the highly plasticised metal as an inviscid compressible fluid. However making this approximation belies the basic elastic nature of a solid object. A more accurate method should strive to incorporate the small but measurable effects of shear strength. Here we present a one-dimensional mathematical model for elastoplasticity at high stress which allows for both compressibility and the shear strength of the material. In the limit of zero yield stress this model reproduces the hydrodynamic models currently used to analyse ICEs. Numerical solutions of the governing equations will then be presented for problems relevant to ICEs in order to investigate the effects of shear strength compared with a model based purely on hydrodynamics.
Symplectic ID
691594
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Publication type
Conference Paper
ISBN-13
9780735414570
Publication date
13 Jan 2017
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