Properties of 2-phases GPL/polymer composites using a mean-field homogenisation. Hybrid 3-phase composites consists on a hierarchical double-scale approach. A crashworthiness test is simulated using the linkage Digimat-CAE/LS-Dyna. A decrease of the crush force peak is noticed for the 3-phases composite. The SEA of the 3-phases composite is improved compared to conventional materials.