Accession Number : ADA316117

Title :   Non-Invasive, Photochromic-Tracer Studies of Particulate Suspensions and Granular Media.

Descriptive Note : Final rept. 1 Jun 95-31 Jul 96,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF APPLIED MECHANICS AND ENGINEERING SCIENCES

Personal Author(s) : Goddard, J. D.

PDF Url : ADA316117

Report Date : 01 SEP 1996

Pagination or Media Count : 7

Abstract : This is a summary of research performed under the subject AFOSR grant on the micromechanics, continuum mechanics and transport properties of granular media and geomaterials. It has involved the development of new theoretical models of microstructure, numerical simulation of granular assemblages, and experimental observation on model systems. The overall goal of the work is to provide a sound microstructural basis for understanding continuum behavior and elucidating structurally and geologically important phenomena such as the propagation of acoustic and seismic waves, the quasi-static yield of granular media, the structural stability of soils and their liquefaction, and the non-invasive testing of geomaterials. The three and one half year effort has involved the Principal Investigator, a postdoctoral research associate, one Ph.D. research assistant and various M.S. research assistants supported in part by the AFOSR grant. This has involved the development and application of an improved computer simulation for idealized granular assemblages to the prediction of dilatancy, scalar conductivity and yield surfaces, continuing development of experimental methods for granular media, and the inception of related work on continuum-mechanical mixture theories for fluid-particle systems and porous media.

Descriptors :   *CONTINUUM MECHANICS, *PARTICULATES, *MICROMECHANICS, *GRANULAR MATERIALS, *TRACER STUDIES, *PHOTOCHROMISM, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, STABILITY, MICROSTRUCTURE, MODELS, CONDUCTIVITY, STRUCTURAL PROPERTIES, NUMERICAL ANALYSIS, GEOLOGY, SURFACES, TRANSPORT PROPERTIES, SOILS, SEISMIC WAVES, ACOUSTICS, SCALAR FUNCTIONS, STATICS, LIQUEFACTION, POROUS MATERIALS.

Subject Categories : Mechanics
      Radiation and Nuclear Chemistry
      Geology, Geochemistry and Mineralogy
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE