Accession Number : AD0838289

Title :   DYNAMIC PROPERTIES OF ROCKS.

Descriptive Note : Final rept. 3 Oct 66-3 Feb 68,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CA POULTER LABS

Personal Author(s) : Rosenberg, J. T. ; Ahrens, T. J. ; Petersen, C. F.

Report Date : JUL 1968

Pagination or Media Count : 72

Abstract : High strain rate (1,000,000 to 100,000,000/sec) release adiabats and the principal Hugoniots of a water-saturated tuff and of fused quartz (representative of the primary solid constituent of tuff) were measured at stresses below 500 kbar in one-dimensional shock-wave experiments using explosively accelerated flyer plates. Results suggest that both materials undergo shock-induced transformations which are at least partially irreversible on the time scale of the experiments. Between 135 and 470 kbar, fully water-saturated NTS Rainier Mesa tuff (initial density 1.9 to 2.1 g/cucm, moisture content 13% to 17%) was found to support a single, stable, plastic shock. However, anomalously low compressibility along the Hugoniot at stresses between 100 and 400 kbar indicates shock-induced phase transformations in some constituents; these are probably allotropic transformations from four- to sixfold coordinated silicate glasses. (Author)

Descriptors :   (*ROCK, MECHANICAL PROPERTIES), SHOCK WAVES, QUARTZ, STRESSES, PETROGRAPHY, COMPRESSIVE PROPERTIES, THERMAL DIFFUSION, GLASS, HEAT, REFRACTIVE INDEX, PARTICLES, VELOCITY, PHASE STUDIES, SILICATES, MOISTURE, DEFORMATION, PRESSURE, ETHANOLS, GLYCEROLS.

Subject Categories : Geology, Geochemistry and Mineralogy
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE