A Plasticity Theory of Metals Based on the Dislocation Substructures
by
Shiing-Hwa Doong
Department of Mechanical and Industrial Engineering
Abstract
A cyclic plasticity model developed from the microscopic deformation mechanism of metals is suggested. In the development of such a mechanistic model, the dislocation substructure of metals under different loadings is studied. Based on the observed substructure, the deformation mechanism of metals is described. The mechanisms that control the macroscopic mechanical behavior of materials are the change of dislocation substructures, the movement of active dislocations and the change in atomic spacing. By making quantitative assumptions for these mechanisms, a plasticity model is established. When compared to the experimental result, the model is found to be capable of predicting the mechanical behavior of metals under highly complicated loading conditions.
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