Comparison of uniaxial deformation in shock and static loading of three rocks


  • W. F. Brace,

  • A. H. Jones


Deformation of a granite, a tonalite, and a limestone in a plane shock wave is compared with triaxial deformation at 10−5 sec−1 under the constraint of uniaxial strain. For granite and for limestone at moderate pressure, the stress-strain relation is nearly identical in the two tests; strain under these conditions was elastically recoverable. For the limestone at high pressure and for the tonalite at all pressures, volume decreases permanently. This permanent deformation, compared here for shock and slow strain-rate tests, had approximately the same strain-rate dependence as has been observed typically in fracture of rocks under triaxial conditions.