Instability and Plastic Flow of Soilsby Daniel Pradel, Lockwood-Singh & Assoc, Los Angeles, United States,
Abstract: Materials should according to Drucker's postulate become unstable when the second increment of plastic work is negative. Experimental observations however show otherwise. Based on the condition that a stable material is able to sustain a small perturbation in load, and the requirement that instability requires the second increment of plastic work to be negative, a condition for the mechanical stability of a material with nonassociated flow can be obtained. Experimental data supports the suitability of this condition to predict instabilities created under undrained conditions.
Subject Headings: Plastics | Soil strength | Strength of materials | Load factors | Soil stress
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