Determination of the dynamic response of brittle composites by the use of the split Hopkinson pressure bar

In this work a split Hopkinson pressure bar (SHPB) setup was used to test brittle, polymeric-matrix composite materials. To provide a consistent and accurate way of performing data analysis, a scheme including dispersion correction, selection of starting points, stress homogeneity and limiting strain rate has been developed. Special emphasis is placed on determining stress homogeneity numerically and experimentally, which is used as a basis for the data analysis procedure. The number of frequencies needed for adequate dispersion correction in the SHPB was found to be a substantial function of the Nyquist frequency of the data acquisition system. Experimental results for a unidirectional graphite/epoxy composite material from quasi-static and SHPB tests are provided. (C) 1999 Elsevier Science Ltd. All rights reserved.