Thermomechanical Characteristics of Nitinol
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The flow stress of a common shape memory alloy, a particular alloy of nitinol, is investigated and presented as a function of temperature and strain. The reversion stress, that stress necessary to maintain a constant strain as a result of a martensitic phase transforming to the parent phase, is presented as a function of temperature and amount of prestrain. This reversion stress is demonstrated to approximate, during the cooling process, the flow stress. The stability of the reversion stress is investigated and is presented as a function of time at 220 deg C. A model of a shipboard device using a shape memory alloy is constructed and studied to compare with pure tensile data.
- Properties of Metals and Alloys