A Computational
Viscoelasticity/damage/plasticity Model For
High-explosive Materials
Author(s)
P. Rangaswamy & R. M. Hackett
Abstract
It is important to be able to accurately predict the behavior of high-explosive
(HE) materials because of the sensitivity with which they respond in the
environment in which they are designed to perform, and because they are also
extremely sensitive to accidental mechanical shock, which might occur during
handling. Thus it is imperative that a capability exists to develop a constitutive
material model and simulate the response of HE materials subjected to a variety
of thermomechanical loading conditions, a response that is characterized as
highly complex. It has been demonstrated through uniaxial strain-rate
experiments conducted at the Los Alamos National Laboratory (LANL) that the
initial response of HE material is rate-dependent, with the growth of microcracks
continuing under load until the yield strength is reached. In a material such as
this, the initial stages of deformation involve both elastic and viscous
mechanisms. It has been postulated that this observed behavior could be
categorized as nonlinear viscoelasticity, coupled with continuing microcracking.
A computational material model containing viscoelasticity, internal damage
accumulation and rate-dependent plasticity has been formulated for the purpose
of simulating the behavior of these types of material systems. The formulation
has been incorporated as a user-defined material (UMAT) into the ABAQUS
finite element code. It is demonstrated in this paper how the material model can
be employed by calibrating it to the experimental response of the material Mock
900-21, a high-explosive material mock utilized at LANL.
Keywords: computational, viscoelasticity, damage, fracture mechanics,
plasticity, user material model.
Keywords
computational, viscoelasticity, damage, fracture mechanics,
plasticity, user material model.
Related Book
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