Dynamic mechanical properties of polycrystalline graphites and a 2D-C/C composite by plate impact

Abstract

In order to obtain dynamic mechanical properties of carbon materials, i.e., two kinds of polycrystalline graphites and a C/C composite, plate impact experiments with simultaneous three poly vinylidene difluoride (PVDF) stress gauges were conducted using a one-stage powder gun system. By this measurement system, Hugoniot curves, rarefaction wave velocities and stress–strain (S–S) curves could be obtained. The Hugoniot curves were valid, rarefaction wave velocities increased with the plateau stress in the specimen, and the slope of the S–S curve was consistent with that of the Hugoniot curve. These dynamic mechanical properties of the carbon materials are useful not only for the understanding of the dynamic behavior but also for impact fracture behavior.