An Improved Criterion To Minimize FE
Mesh-dependency In Concrete Structures
Subjected To Blast And Impact Loading
Author(s)
H. G. Kwak & H. G. Gang
Abstract
In the context of an increasing need for reliability and safety in
concrete structures under blast and impact loading conditions, the behavior
of concrete under high strain rate condition has been an important issue. Since
concrete subjected to impact loading associated with high strain rate shows quite
different material behavior from that in the static state, several material models
are proposed and used to describe the high strain rate behavior under blast and
impact loading. In the process of modelling, in advance, mesh dependency in the
used finite element (FE) is the key problem because simulation results under
high strain-rate condition are quite sensitive to applied FE mesh size. It means
that the accuracy of simulation results may be deeply dependent on FE mesh size
in simulations. This paper introduces an improved criterion which can minimize
the mesh-dependency of simulation results on the basis of the fracture energy
concept, and HJC (Holmquist Johnson Cook), CSC (Continuous Surface Cap)
and K&C (Karagozian & Case) models are examined to trace their relative
sensitivity to the used FE mesh size. To coincide with the purpose of the
penetration test with a concrete plate under a projectile (bullet), the residual
velocities of projectile after penetration are compared. The correlation studies
between analytical results and the parametric studies associated with them show
that the variation of residual velocity with the used FE mesh size is quite reduced
by applying a unique failure strain value determined according to the proposed
criterion.
Keywords: high strain rate concrete, penetration simulation, failure strain,
mesh-dependency, fracture energy.
Keywords
high strain rate concrete, penetration simulation, failure strain,
mesh-dependency, fracture energy
Related Book
Other papers in this volume
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