Numerical Simulations On Adiabatic Shear
Behaviour Of 921A Steel Pure Shear
Hat-shaped Specimens
Author(s)
J. C. Li, X. W. Chen & G. Chen
Abstract
The adiabatic shear behaviour of a specimen is observed, based on a series of
numerical simulations of SHPB test using 921A steel pure shear hat-shaped
specimens in the present paper. The initiation and the propagation of an adiabatic
shear band (ASB) and the relative distribution of temperature field in the
specimen are analyzed. It is found that ASB is formed as the spread of an
unstable zone with high temperature and high strain in the two ends of the Shear
Zone. The spread speed of an ASB is related to the loading rate V0, whilst the
width of ASB is nearly independent of the loading rate. All the ASBs are
deformed bands corresponding to various values of V0.
Keywords: SHPB, pure shear hat-shaped specimen, adiabatic shear
deformation, numerical simulation.
1 Introduction
Adiabatic shear deformation usually occurs in the high-speed deformations such
as high-speed impact and penetration, etc. Adiabatic rising-temperature will lead
the thermal softening effect and thus adiabatic shear band (ASB) occurs in the
material. An ASB usually has a width of 10–100μm, in which the shear strain,
shear strain rate and temperature can achieve a value of 1–102, 105–107s-1, and
102–103K, respectively.
Meyers et al. [1] designed a pure shear hat-shaped specimen as shown in
Figure 1, in which the Shear Zone deforms as a pure shear deformation when the
specimen undergoes compressive loading. This hat-shaped structure has been
used widely to study the adiabatic shear behaviour of material. Accompanied
Keywords
SHPB, pure shear hat-shaped specimen, adiabatic shear deformation, numerical simulation
Related Book
Other papers in this volume
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