Development of a dropweight system was used to obtain stress–strain data for polymeric materials under high strain rate impact. The system consisted of a combination of a high-speed camera and a dropweight instrumented with an accelerometer. Sample deformation during impact was recorded photographically, and the images were then scanned into a PC in order to measure sample deformation strain. The combination of the accelerometer signal and the camera results allowed sample deformation stress to be measured. The stress–strain curves enable the energy of fracture and the temperature rise of the polymer to be calculated. In addition, the high-resolution images enable the flow mechanism and the deformation mode to be viewed clearly.
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Lee et al. (2004) studied this question.