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Pressure-volume release path model for SOC and TNSOR. [Shock wave propagation through rocks]

Description: In most numerical codes which simulate shock wave propagation through rocks the stresses which drive the grid are separated into a mean stress and deviatory components. The mean stress (P = -/sup 1///sub 3/ t/sub ii/) is measured as a function of volume on small samples in the laboratory which is normally called the hydrostat. Repeating these measurements on many samples, unloading each sample from a different mean stress, will produce a single loading pressure-volume curve and a series of unlo… more
Date: December 18, 1972
Creator: Terhune, R.; stephens, D. & Petersen, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nature of simultaneous processes in plastic deformation

Description: The nature of two simultaneous processes is analyzed in detail. It is found that the experimental activation enthalpy increases with temperature for parallel processes and decreases with temperature for consecutive processes. Similarly the activation volume increases with pressure for consecutive processes and decreases with pressure for parallel processes. The creep rate stress exponent increases with stress for parallel processes and decreases with stress for consecutive processes. Each activ… more
Date: January 1, 1972
Creator: Li, J.C.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Studies of low temperature phase transformations in high field superconductors and the phonon spectrum and mechanical properties of vanadium. Final report

Description: Extensive studies of the structure and phase transformations of high field superconductors of the BETA -tungsten type were made. A phase transformation was discovered at 43 deg K in Nb/sub 3/Sn and the structure of the low temperature phase was measured. The details of the transformation in terms of the formation of the low temperature tetragonal phase from the high temperature cubic phase was investigated both by x-ray observations and optical microscopy below 40 deg K. The complete phonon dis… more
Date: January 1, 1972
Creator: Batterman, B.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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