Emu predicts the
deformation and failure of bodies and structures under dynamic loading
-- especially failure due to fracture.
It can model any number of fractures and allows them to grow in
Emu is the first code
based on the peridynamic theory of solid mechanics. The peridynamic
theory replaces all of the equations of the conventional theory of
continuum mechanics. It
uses integral, rather than differential equations.
The integral equations remain valid regardless of any fractures
or other discontinuities that may emerge in a body due to loading. In
contrast, the differential equations of the classical theory break down
when such a discontinuity appears. So, the underlying mathematical model
in Emu is very different from what is found in finite element codes.
Because Emu uses this
alternative set of underlying equations, cracks emerge spontaneously as
a result of the equations of motion and material model.
The cracks grow in whatever direction is energetically favorable
for growth. The code does
not use stress intensity factors, and it does not require a separate law
that tells cracks when and where to grow.
Also, Emu is meshfree -
it does not use elements, and there are no geometrical objects
connecting the grid points. Therefore,
there is no need for a mesh generator when modeling complex structures.
Emu is currently in the
research and development stage and is being licensed to a few