A numerical study of Rayleigh-Taylor instability in aluminum and steel plates Page: 2 of 32
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LA--11192-MS
DE88 010475
A NUMERICAL S'T'UDY OF RAYLEIGH-TAYLOR
INSTABILITY IN ALUMINUM AND STEEL PLATES
by
Bart J. Daly
ABSTRACT
The SCRAM code is applied to the study of Rayleigh-Taylor
instability in metal plates, and comparisons of these computer re-
suIts are made with experimental data for 1100-0 aluminum, 6061-T6
aluminum, and 304 stainless steel. Various models for the pressure,
temperature, and strain-rate dependencies of the flow stress are
compared in the computer calculations. The coefficients that are
required in these models to give good agreement with the experi-
mental results are generally close to values that were determined
from previous experimental comparisons. The sensitivity of the
computed results to modeling parameters, to variations in the hard-
ening modulus, and to the amplitude and wavelength of the pertur-
bations in the plate surface is examined. Very little growth in ampli-
tude occurs if either the initial amplitude or the wavelength is suffi-
ciently small. The growth rate increases monotonically with increas-
ing initial amplitude. There appears to exist a wavelength of maxi-
mum growth, such that the growth rate increases rapidly with wave-
length up to this wavelength, but than decreases slowly as the wave-
length is further increased.
I. INTRODUCTION
Blewetti and Barnes et al.2 describe a series of experiments that were per-
formed to determine the growth rate of surface waves in plates composed of 1100-0
aluminum, 6061-T6 aluminum, and 304 stainless steel. In these tests the plates
were accelerated by high explosives (H.E.). The entire apparatus was enclosed in a
vacuum chamber, and a vacuum was maintained between the H.E. and the plate
(Fig. 1) in order to provide a shockless acceleration of the plate. Table I lists the
conditions and results of these experiments. The aluminum plates were 0.254 cm
thick, while the stainless steel plates were 0.190 cm thick. In all but one test the
wavelength of the surface perturbations was 0.508 cm and the amplitude of the1
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Daly, B.J. A numerical study of Rayleigh-Taylor instability in aluminum and steel plates, report, March 1, 1988; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1053550/m1/2/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.