PROCESSES OCCURRING IN SHOCK WAVE COMPRESSION OF ROCKS AND MINERALS

Abstract Recent advances in time-resolved shock-wave instrumentation and improved methods for analyzing continuous stress-wave data are providing a clearer picture of the processes of yielding and phase transformation occurring during shock compression of rocks and minerals. The present report reviews the advances in time-resolved shock-wave instrumentation which are currently being used and describes the analysis techniques which have been developed to relate shock-wave profiles to the thermomechanical processes occurring during shock compression. Evidence for complicating features resulting from yielding in silicates and oxides is reviewed and a physical model for phase transitions based on heterogeneous deformation and thermal activation is discussed. New supporting data on the shock compression and relief properties of periclase and calcite are presented and considered in terms of a mechanism of heterogeneous deformation.

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