Modelling of granular materials in the autodyn hydrocode

Two methods for creating a two-component material in Autodyn are described. In the first approach we fill two separate subgrids with different materials whereas the second method fills one subgrid with two different materials. Both methods rely on the use of special user subroutines to create an Autodyn version with extended functionality. Instructions for using the extended Autodyn program are provided and the implementation is discussed and documented.