During stress wave propagation through a composite material, the wave velocities through the fibre and matrix are different because of the differences in the respective moduli and densities. The stresses and strains generated in the constituent material are accordingly related to the wave velocities. In a typical split Hopkinson pressure bar (SHPB) experiment, the composite coupon is held in between the incidence and transmitter bars and a global response is obtained. While this provides a basis of comparison between various material systems, the information is not sufficient to predict failure of the composite precisely. Knowledge of the individual responses of the fibres and the matrix is needed for accurate failure analysis. However, the existing SHPB formulations are not capable of extracting individual responses from a regular test set-up. In the current investigation, a new set of mathematical formulations has been derived from the momentum concept so that the individual strain and stress responses of the fibres and the matrix can be estimated from regular SHPB tests. Coaxial cylindrical coupons have been designed and fabricated for this purpose. Test results indicate that there is good correlation between the predicted and experimental data, especially at lower strain rates. Details of the mathematical derivations and experimental procedures are described in the paper.
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