Accession Number : ADA310331

Title :   Cemented Particulate Materials: From Grain-to-Grain Contact to Macro-Behavior.

Descriptive Note : Final rept. 1 Jan 93-31 Dec 95,

Corporate Author : STANFORD UNIV CA DEPT OF GEOPHYSICS

Personal Author(s) : Dvorkin, Jack

PDF Url : ADA310331

Report Date : 20 APR 1996

Pagination or Media Count : 113

Abstract : The overall objective of the proposed research was to provide a quantitative description of the microstructural, as well as macroscopic mechanical behavior of particulate materials with intergranular cementation in a wide range of strain amplitudes and for various types of the cementation material. By cementation, a material is meant which fills the space between two surfaces that are (a) separated or (b) contact directly. This objective was achieved by deriving microstructural contact laws for the combination of two cemented elastic spherical grains subject to normal, shear, or torsional loading. The cement was treated as an elastic, elastic-plastic, purely plastic, and viscous material. The macroscopic constitutive laws were derived from the above microstructural contact laws by using the formulas which relate the effective moduli of the random packing of identical spheres to the normal and tangential contact stiffnesses. The theoretical solutions were positively supported by experiments performed on artificial cemented aggregates, as well as by other experiments performed of real cemented rocks. The main relevance to the Air Force mission is through a quantitative description of cemented geomaterials such as asphalt cement. The results have been used at the Wright laboratory to model asphalt concrete's behavior.

Descriptors :   *CEMENTS, LOAD DISTRIBUTION, MICROSTRUCTURE, DEFORMATION, SHOCK WAVES, STIFFNESS, ELASTIC PROPERTIES, ASPHALT, CONCRETE, GRAIN SIZE, STRAIN(MECHANICS), ROCK, POROSITY, AGGREGATES(MATERIALS), SHEAR STRESSES, PLASTIC PROPERTIES, PARTICULATES, NUCLEAR EXPLOSION DETECTION, EPOXY RESINS, VISCOSITY, TORSION, GRANULAR MATERIALS, ELASTOPLASTICITY.

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE