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Author(s): M. Raguraman & A. Deb
Abstract:
This paper deals with the simulation-driven study of the impact of hardened steel
projectiles on thin aluminium target plates using explicit finite element analysis
as implemented in LS-DYNA.
The evaluation of finite element modelling
includes a comprehensive mesh convergence study using shell elements for
representing target plates and the solid element-based representation of ogivalnosed
projectiles.
A user-friendly automatic contact detection algorithm is used
for capturing interaction between the projectile and the target plate.
It is shown
that the proper choice of mesh density and strain rate-dependent material
properties is crucial as these parameters significantly affect the computed
residual velocity.
The efficacy of correlation with experimental data is adjudged
in terms of a ‘correlation index’ defined in the present study for which values
close to unity are desirable.
By simulating laboratory impact tests on thin
aluminium plates carried out by earlier investigators, extremely good prediction
of experimental ballistic limits has been observed with correlation indices
approaching unity.
Additional simulation-based parametric studies have been
carried out and results consistent with test data have been obtained.
The
simulation procedures followed in the present study can be applied with
confidence in designing thin aluminium armour plates for protection against low
calibre projectiles.
Keywords:
residual velocity, ballistic limit, projectile, aluminium plate, finite
element modelling, LS-DYNA.
...
Pages: 10
Size: 748 kb
Paper DOI: 10.2495/SU060211
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