  Modeling dynamics fracture in materials involves usage of hydrodynamic codes
which solve basic conservation laws of mass, energy and momentum in space and
time. This requires appropriate models to handle elastic-plastic deformation,
equation of state, material strength, and fracture. Nucleation and Growth (NAG)
damage model is a micro-physical model which computes amount of damage in the
material by accounting for phenomena like nucleation, growth and coalescence of
voids or cracks. The NAG model involves several material model parameters, such
as nucleation threshold, growth threshold, etc. Traditionally these parameters
are fitted to experimental void volume distributions. In the present paper we
fit these parameters to molecular dynamics (MD) simulations of void nucleation
and growth and use the fitted parameters in hydrodynamic simulations in a
multi-scale computational approach. Cubic metallic single crystals are
subjected to isotropic deformation and the nucleation of voids and their growth
were post-processed from the simulations. These results are used in an in-house
Particle Swarm Optimization (PSO) code to obtain NAG parameters for materials
of our interest. Using these parameters in a 1D hydrodynamic code developed
in-house, fracture parameters such as spall strength and thickness are
obtained. The results are validated with published experimental data for Mo, Nb
and Cu which have been simulated using the multi-scale model. This paper
describes the application of the multi-scale model to obtain the NAG fracture
model parameters of Al and its spall data. The results are compared with
published experimental results in single crystal Al.
