You can use the concept of unit cell modeling. Unit cell modelling assumes regular arrangement of particles at equal interval like atoms in SC , BCC and FCC structure. If you know the particle size and volume fraction you can calculate the dimensions of the unit cell . The particle matrix properties shall be assigned to the respective region of the unit cell. The necessary boundary conditions shall be applied. The stress and deformation can be studied by applying load on the face of the unit cell.

However , nowadays, micro-structure based models are used for the prediction of properties. for details pls refer to Journal of Materials Processing Technology - J MATER PROCESS TECHNOL 01/2008; 207(1):53-62. DOI:10.1016/j.jmatprotec.2007.12.077