The dynamic damage evolution and the damage modified constitutive response for polypropylene-polyamide polymer blends with different compatibilisers are experimentally investigated by a new technique, namely by combining the split Hopkinson pressure bar technique with the back propagation neural network. The results reveal that the damage evolution including the threshold condition for the beginning of damage evolution, are dependent on both strain and strain rate. Thus for viscoelastic materials, particularly for polymer blends or composites, mechanical behaviour with damage evolution should be evaluated in a wide range of strain rates.
