Investigations Into the Physical Mechanisms That Facilitate Transformation Hysteresis in Shape Memory Alloys
Hamilton, Reginald F.
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https://hdl.handle.net/2142/83915
Description
Title
Investigations Into the Physical Mechanisms That Facilitate Transformation Hysteresis in Shape Memory Alloys
Author(s)
Hamilton, Reginald F.
Issue Date
2008
Doctoral Committee Chair(s)
Sehitoglu, Huseyin
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
Abstract
Influences of energy dissipative mechanisms are rationalized using a theoretical approach which combines micro-mechanics and thermodynamics into a thermo-mechanical framework. Models are formulated for the thermal and stress hysteresis based on a thermo-mechanical framework so as to shed light into differential hysteresis magnitudes. Current theoretical formulations consider energy dissipation from a phenomenological point view and satisfy the second law of thermodynamics by considering a dissipative potential. In the current study, an earlier thermo-mechanical formulation is advanced beyond phenomenological considerations to include the effects of micro-scale plasticity. With this, the hysteresis models can account for energy dissipation resulting from strain energy relaxation. The current modeling approach provides intuitive predictions of the experimentally observed behavior particularly a growing hysteresis with increasing stress for NiTi alloys.
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