Effect of stress state on the stress-induced martensitic transformation in polycrystalline Ni-Ti alloy |
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Authors: | Kurt Jacobus Huseyin Sehitoglu Mark Balzer |
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Affiliation: | (1) Department of Mechanical and Industrial Engineering, University of Illinois at Urbana—Champaign, 61801 Urbana, IL |
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Abstract: | The effect of stress state on the character and extent of the stress-induced martensitic transformation in polycrystalline
Ni-Ti shape memory alloy has been investigated. Utilizing unique experimental equipment, uniaxial and triaxial stress states
have been imposed on Ni-Ti specimens and the pseudoelastic transformation strains have been monitored. Comparisons between
tests of differing stress states have been performed using effective stress and effective strain quantities; a strain offset
method has been utilized to determine the effective stress required for transformation under a given stress state. Results
of the tests under different stress states indicate that (1) despite the negative volumetric strain associated with the austenite-to-martensite
transformation in Ni-Ti, effective stress for the onset of transformation decreases with increasing hydrostatic stress; (2)
effective stressvs effective strain behavior differs greatly under different applied stress states; and (3) austenite in Ni-Ti is fully stable
under large values of compressive hydrostatic stress. |
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