Abstract
Most materials show a significant change in mechanical behaviour as the rate of strain (the deformation rate) is increased1 (see High Strain Rate Effects). This is particularly evident at the high strain rates (>102 s −1) which occur under impact or explosive loading conditions. For polymeric materials, both the elastic modulus and the flow stress can increase substantially with strain rate. The split-Hopkinson pressure bar (SHPB) technique is the best established method for determining these dynamic properties of solids at high strain rates in the range of about 102 to 104 s−1 (see refs. 2 and 3). In its various forms, the SHPB technique can produce stress/strain/strain rate data in compression, tension and torsion.
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