Cemented Particulate Materials: From Grain-to-Grain Contact to Macro-Behavior.
Final rept. 1 Jan 93-31 Dec 95,
STANFORD UNIV CA DEPT OF GEOPHYSICS
Pagination or Media Count:
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 concretes behavior.
- LOAD DISTRIBUTION
- SHOCK WAVES
- ELASTIC PROPERTIES
- GRAIN SIZE
- SHEAR STRESSES
- PLASTIC PROPERTIES
- NUCLEAR EXPLOSION DETECTION
- EPOXY RESINS
- GRANULAR MATERIALS
- Ceramics, Refractories and Glass