Thermomechanical behavior of superelastic wires undergoing sequential martensitic transformation was investigated by two recently developed in-situ experimental methods (in-situ neutron diffraction and combined ultrasonic and electric resistance measurements) capable of detecting and recognizing the activity of various deformation/transformation processes in and theoretically by micromechanical modeling. An earlier model of SMA polycrystal transformation is further developed, so it accounts for the strains due to the R-phase related deformation processes in activated . A continuous variation of the rhombohedral distortion angle of the R-phase structure with temperature and stress is newly introduced as a legitimate deformation mechanism. Simulation results for bars and wires exposed to three types of thermomechanical tests—mechanical loading at constant temperature, cooling under constant stress, and recovery stress tests are presented and confronted with results.
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July 2006
Special Section On Damping Of Shape Memory Alloys, Composites, And Foams
Stress-Strain-Temperature Behavior Due to Transformation in Polycrystals
V. Novák,
V. Novák
Institute of Physics
, ASCR, Na Slovance 2, Prague, 18221, Czech Republic
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P. Lukáš,
P. Lukáš
Nuclear Physics Institute
, ASCR, 250 68 Řež, Czech Republic
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M. Landa
M. Landa
Institute of Thermomechanics
, ASCR, Dolejškova 5, Prague 8, 18000, Czech Republic
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P. Šittner
V. Novák
Institute of Physics
, ASCR, Na Slovance 2, Prague, 18221, Czech Republic
P. Lukáš
Nuclear Physics Institute
, ASCR, 250 68 Řež, Czech Republic
M. Landa
Institute of Thermomechanics
, ASCR, Dolejškova 5, Prague 8, 18000, Czech RepublicJ. Eng. Mater. Technol. Jul 2006, 128(3): 268-278 (11 pages)
Published Online: February 26, 2006
Article history
Received:
August 26, 2005
Revised:
February 26, 2006
Citation
Šittner, P., Novák, V., Lukáš, P., and Landa, M. (February 26, 2006). "Stress-Strain-Temperature Behavior Due to Transformation in Polycrystals." ASME. J. Eng. Mater. Technol. July 2006; 128(3): 268–278. https://doi.org/10.1115/1.2204945
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