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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 complex patterns. 

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 “alpha” users.
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If you have any questions or comments regarding the information on this page,
please contact:  Stewart Silling.

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