Influence Of The Constitutive Relation In
Numerical Simulations Of The Perforation Of
Steel Plates
Author(s)
S. Dey, T. Børvik, O. S. Hopperstad & M. Langseth
Abstract
In the present study, the influence of the constitutive relation in numerical
simulations of the perforation of steel plates has been studied using the nonlinear
finite element code LS-DYNA. Two well-known constitutive relations
found in the literature are combined with a fracture criterion, and these models
have been used in the simulations. The different models have been calibrated and
validated for the target material Weldox 460 E using experimental data obtained
from tensile tests where the effects of strain rate, temperature and stress
triaxiality were taken into account. Numerical simulations of the perforation
process indicate that the physical mechanisms can be qualitatively well predicted
independently of the chosen constitutive relation, but quantitatively more severe
differences appear.
Keywords: high-strength steel, Johnson-Cook, Zerilli-Armstrong, ballistic
penetration, LS-DYNA.
1 Introduction
In order to model the mechanical response of structures exposed to ballistic
impacts, it is necessary to establish reliable constitutive relations and failure
criteria as functions of large strains, high strain-rates, high temperatures, varying
stress states and history of loading, in addition to accumulation of damage and
mode of failure. A complete description that includes all these phenomena is
however difficult to obtain, and certainly the model will become more complex
by increasing the number of phenomena involved. To simplify the modelling it is
necessary to introduce assumptions according to the problem investigated.
Keywords
high-strength steel, Johnson-Cook, Zerilli-Armstrong, ballistic
penetration, LS-DYNA.
Related Book
Other papers in this volume
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