Abstract
Hysteretic behavior of unidirectional TiNi SMA/Epoxy composites subjected to a single isothemal loading and unloading cycle has been analyzed using a three-dimensional micromechanical unitcell model. The multiaxial constitutive equations developed in the previous study were applied to the description of the stress-induced rhombohedral and martensitic transformations of the SMA fibers embedded in the epoxy matrix. It was clearly observed that the global behavior of the SMA composites was governed by the pseudoelastic property of the SMA fibers. The hysteretic responses of SMA composites were significantly influenced by the SMA fiber volume fraction. For a high volume fraction of the SMA fibers, the rhombohedral transformation of the embedded SMA fibers characterized a pseudoelasticity-like behavior of SMA composites. This predication indicates a feature unique to the multiaxial SMA constitutive model developed in the previous report.
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