Abstract
Taylor tests are a mean to investigate the dynamic plastic and failure behaviour of metals under compression. By taking in account the strengthening occurring at high strain rates, the Taylor final diameter of a pure nickel impacted at 453 m/s have been numerically reproduced by 13%. Through post-mortem observations of the specimen impacted at 453 m/s, a recrystallization process has been found to occur resulting in a softening of the pure nickel. Subsequent numerical simulations taking in account this softening have been found to reduce the difference between experimental and numerical diameter by 10%.
Highlights
There are known challenges with the numerical simulation of large plastic deformation of metals generated under high strain rates [1]
Such challenge has been answered by taking in account the strengthening occurring in the viscous regime with the use of adequate constitutive models such as the Zerrilli Amstrong or modified JohnsonCook models [2]
A numerical investigation has been conducted to establish that the Teflon supports did not interfere during the plastic deformation of the Taylor specimens made of aluminium for a test conducted at an impact speed of 335 m/s [8]
Summary
There are known challenges with the numerical simulation of large plastic deformation of metals generated under high strain rates [1]. One of the challenges is the stabilization of plastic deformation when the viscous behavior of the dislocations prevailed. Such challenge has been answered by taking in account the strengthening occurring in the viscous regime with the use of adequate constitutive models such as the Zerrilli Amstrong or modified JohnsonCook models [2]. A challenge remains with regard to the accuracy of the simulations. This challenge has been quantified with the numerical simulations of symmetric Taylor tests conducted with a pure nickel. At an impact speed of 453 m/s, the numerical simulation was found to underestimate the final diameter of the Taylor specimen by 13% [2]
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