Experimental investigation of the behavior of granular media

Document Type

Conference Proceeding

Publication Date

12-1-1992

Abstract

The objective of this work is to determine the experimental parameters necessary for establishing the micromechanical foundation for a constitutive law for granular media. These parameters include the hardening characteristics of the yield surfaces of a granular medium under various levels of prestrain, and the observed normality and flow rules. For this, a number of experiments was performed under specific stress paths on hollow cylindrical specimens composed of glass beads. Yielding was defined as the point at which irreversible geometric deformation occurs in the material. The experimental procedure followed is similar to that proposed by the late Prof. Phillips (Phillips 1968) for aluminum which is widely used for testing engineering materials. In a first stage a series of drained monotonic radial shear stress tests were performed to establish the strength-deformation and symmetry characteristics of the material. These were followed by a series of tests that determined the shape of the initial and subsequent yield loci. The second series of experiments was performed along specific stress paths in the axial and torsional directions. It was found that the yield surfaces of granular media distort in the direction of prestraining by forming an apex while they flatten in the opposite direction. Another important phenomenon observed is the presence of significant reversible (elastic) volumetric strains at strain loading of the order of 10-4. All of the above described phenomena can be interpreted by the changes that occur in the structure of the material during prestraining, in particular with the development of an anisotropic texture during prestraining.

Identifier

0026964086 (Scopus)

ISBN

[0791810984]

Publication Title

American Society of Mechanical Engineers Materials Division Publication MD

First Page

93

Last Page

106

Volume

37

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