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Micromechanics of Tension‐Compression Asymmetry of Polycrystalline Shape‐Memory‐Alloys
Author(s) -
Hackl K.,
Zhang W.,
SchmidtBaldassari M.,
Hoppe U.
Publication year - 2004
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.200400729
Subject(s) - micromechanics , shape memory alloy , materials science , asymmetry , compression (physics) , crystallite , nickel titanium , tension (geology) , context (archaeology) , diffusionless transformation , stress (linguistics) , deformation (meteorology) , phase (matter) , energy minimization , martensite , mechanics , composite material , thermodynamics , metallurgy , microstructure , physics , chemistry , geology , composite number , computational chemistry , quantum mechanics , paleontology , linguistics , philosophy
The asymmetry associated with martensitic transformations observed in tension/compression experiments of shape‐memory‐alloys (SMAs) is investigated on the basis of a recently suggested micromechanical model. The approach is based on crystallographic theory and utilizes a framework of energy minimization in a finite deformation context. Polycrystalline NiTi under tension demonstrates smaller phase‐transformation start‐strain, differe phase‐transformation stress‐levels and flatter phase‐transformation stress‐strain slopes than that under compression in our numerical simulation. The phase‐transformation start‐stress is followed to have a linear relationship with respect to the temperature within a certain range. These results agree well with experimental results reported in the literature.