A Plasticity Theory of Metals Based on the Dislocation Substructures
Doong, Shiing-Hwa
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https://hdl.handle.net/2142/70158
Description
Title
A Plasticity Theory of Metals Based on the Dislocation Substructures
Author(s)
Doong, Shiing-Hwa
Issue Date
1988
Doctoral Committee Chair(s)
Socie, Darrell F.
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Engineering, Metallurgy
Engineering, Materials Science
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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