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Preisach modeling of hysteresis for a pseudoelastic Cu-Zn-Al single crystal
Ortín, Jordi, 1959-
Universitat de Barcelona
Stress-strain trajectories associated with pseudoelastic behavior of a Cu¿19.4 Zn¿13.1 Al (at.%) single crystal at room temperature have been determined experimentally. For a constant cross-head speed the trajectories and the associated hysteresis behavior are perfectly reproducible; the trajectories exhibit memory properties, dependent only on the values of return points, where transformation direction is reverted. An adapted version of the Preisach model for hysteresis has been implemented to predict the observed trajectories, using a set of experimental first¿order reversal curves as input data. Explicit formulas have been derived giving all trajectories in terms of this data set, with no adjustable parameters. Comparison between experimental and calculated trajectories shows a much better agreement for descending than for ascending paths, an indication of a dissymmetry between the dissipation mechanisms operative in forward and reverse directions of martensitic transformation.
Ciència dels materials
Equacions d'estat
Regla de les fases i equilibri
Transformacions de fase (Física estadística)
Materials science
Equations of state
Phase rule and equilibrium
Phase transformations (Statistical physics)
(c) American Institute of Physics, 1992
American Institute of Physics

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