In a dynamic compression test deformation is found to be non uniform due to friction. In cross sections the test specimens form a shear deformation zone. The width of this zone varies with both materials under test and the test conditions. The zone widths are found to decrease with both decreasing test temperature and increasing strain rate. The effects of friction can be removed by the application of the Cook and Larke method if the material microstructures are consistent. Tests results from a series of plain-carbon steel test specimens are presented in the form of load-time data, micro-structural examinations of the sectioned specimens, micro-hardness measurements taken across the deformation zones and Cook and Larke analysis.
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