A Statistical Theory of Polycrystalline Plasticity
- Creators
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Ortiz, M.
- Popov, E. P.
Abstract
The plasticity and viscoplasticity of polycrystalline materials are studied analytically in terms of lattice dislocations, with the principal effects attributed to non-extended obstacles. Non-equilibrium statistical mechanics is used to describe the evolution of the dislocation structures during loading and unloading processes. A plausible variation in the probability density function for mobile dislocations for such processes is suggested. The proposed material model is in good qualitative agreement with several observed phenomena that previously could not be quantified on the basis of the dislocation theory. Numerical examples illustrate the effect of the rate of loading, the variations in the recovery effect as it relates to the extent of load reversal, and a means for treating materials that exhibit a yield plateau. In the limit, the proposed model yields results for inviscid plasticity.
Additional Information
© 1982 Royal Society. (Communicated by O. C. Zienkiewicz, - Received 15 May 1981) This paper was motivated by general studies of seismic behaviour of structural components being conducted at the University of California, Berkeley, and is prepared with financial assistance from the National Science Foundation, grant PFR-7908984. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the National Science Foundation.Additional details
- Eprint ID
- 84155
- Resolver ID
- CaltechAUTHORS:20180105-154320925
- PFR-7908984
- NSF
- Created
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2018-01-08Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field
- Caltech groups
- GALCIT