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The 3-D four-direction braid carbon/epoxy composites have been tested in compression under quasi-static loading and high strain rate loading. And the tests were conducted at strain rates up to 2000/s by split Hopkinson pressure bar (SHPB) and MTS in the paper. The loading pulses in split Hopkinson pressure bar apparatus were modified by pulse shaping techniques such that the samples are in dynamic stress equilibrium and deformed at a nearly constant strain rate over most of the dynamic compression duration. The results indicated that the peak stress and stiffness along the transverse direction were larger than those along the thickness direction. In addition the effect of the strain rate on peak stress and the stiffness was also discussed in the paper.

An investigation of the dynamic behavior of 3-D four direction carbon-fibers/epoxy braid composites at various strain rates