A tensile version of the split Hopkinson bar, suitable for dynamic testing of laminated composite materials, is introduced. A pulse duration of 200-250 microseconds and peak strain rates of up to 350 s-1 are obtained. Tests performed on a quasi-isotropic lay-up of graphite-epoxy show good repeatability. To determine the significance of rate-dependency, static tests were also performed using an identical specimen configuration as in the dynamic tests. Comparison of the Hopkinson bar tests to those performed at a quasi-static rate on a hydraulic test machine shows the rate-dependency of this lay-up of graphite-epoxy. Tensile strength and fracture strain are found to be higher for dynamic testing.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Mechanics of Materials
- Mechanical Engineering
- Materials Chemistry