Dynamic Compression Failure Of Two Metals At
0.5 And 1.5 GPa
Author(s)
H. Couque
Abstract
The influence of pressure on dynamic failure under compression of a highstrength
tungsten alloy and a hardening steel was investigated. Two dynamic
compression tests were employed. The first one, a symmetric Taylor test,
provides low pressure data while the second one, a modified version of the hat
test called the hydrodynamic hat test, generates data at pressures up to 1.5 GPa.
Failure strain data were obtained from numerical simulations of the tests. For
both metals, the increase of pressure was found to lower the failure strain
associated with adiabatic shear banding preceding shear failure. These results are
interpreted through a reduction of the plastic work being converted in heat with
the increase of pressure delaying adiabatic shear band formation.
1 Introduction
The knowledge of the dynamic failure mechanisms for metals subjected to
combined compression and pressure is of interest for the interpretation of
ammunition penetration process and ship formation during machining. Bai and
Dodd suggested that the compression failure strain increases up to a critical
pressure of 0.4 GPa [1] based on the interpretation on the failure mechanisms
following adiabatic shear band (ASB) formation in steel and copper. This
increase is interpreted through high pressures delaying void nucleation and
growth within the shear band. This analysis goes along with post-mortem
observations of armor steels revealing ASB without failure. With regard to the
influence of pressure on ASB formation, it is only recently that the influence of
pressure has been investigated with the introduction of a hydrodynamic hat
specimen designed to generate data at a pressure of 1.5 GPa [2].
Keywords
Related Book
Other papers in this volume
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