Accession Number : ADA306399

Title :   Constitutive and Localization Models for Assemblies of Circular Disks.

Descriptive Note : Final rept. 1 Nov 91-31 Oct 95,

Corporate Author : STANFORD UNIV CA

Personal Author(s) : Borja, Ronaldo I. ; Wren, Jon R.

PDF Url : ADA306399

Report Date : 31 DEC 1995

Pagination or Media Count : 205

Abstract : The complex response of a granular material to loading and unloading results directly from its particulate nature. The independent particle motions affect load transferal among neighboring grains and alters the microstructure of the material. Constituent particles typically transfer load through shear and normal forces at contacts with neighboring particles, causing the overall stress to be unevenly distributed in the material. This research focuses on the development of a mathematical model to derive the response of a macroscopic point in a granular material from the overall response of collection of particles. The formulation describes a methodology for deriving the macroscopic constitutive law from an implicit generation of the micromechanical response of the assembly using a quasi-static, and not a dynamic approach. The quasi-static approach is more appropriate for a broader class of engineering applications where inertia affects are negligible. The influence of pore fluid on the response of the assembly is also investigated in this research.

Descriptors :   *SOIL MECHANICS, MATHEMATICAL MODELS, MICROSTRUCTURE, INERTIA, DYNAMICS, RESPONSE, PARTICULATES, TRANSFER, STATICS, GRANULAR MATERIALS, UNLOADING.

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE