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Abstract:
A comprehensive research effort was conducted on constitutive and micromechanical modelling of granular soil. This includes: (1) the development of a new constitutive relation for granular media based on the contact law between two spheres; (2) an experimental investigation on the stress-strain response of a glass bead material with 46 monotonic and cyclic experiments on hollow cylinder specimens, most of them constant mean stress tests to measure deviatoric response and behavior of initial and subsequent yield loci; and (3) numerical simulations of the behavior of granular media using the discrete element method. The proposed constitutive law captures a number of key aspects of the observed stress-strain behavior of granular soils, and it predicts well the experiments on glass beads. Novel aspects of the proposed model include yield cones parallel to the failure envelope, and a basic relation between the field of elastoplastic moduli and the elastic constants of the material.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Final rept. 6 Jan 89-15 May 91 |
| Pages: |
82 |
| Report Date: |
22 MAY 91 |
| Contract Number: |
AFOSR-89-0350 |
| Report Number: |
A190832 |
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