Thermomechanical characteristics of Nitinol
Johnson, John Michael
Edwards, Glen R.
MetadataShow full item record
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 pre-strain. 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 C. A model of a shipboard device utilizing a shape memory alloy is constructed and studied to compare with pure tensile data.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Thermal stress and bowing of a tube subjected to a temperature distribution independent of tube length. Haworth, William Perry (Monterey, California: U.S. Naval Postgraduate School, 1964);The theorem of least work was used to investigate the stress pattern and bowing, i,e, uniform curvature, of an initially straight thin tube subjected to a steady temperature distribution independent of the longitudina ...
Stress corrosion cracking and hydrogen embrittlement of thick section high strength low alloy steel. Needham, William Donald (1986);An experimental study was conducted to evaluate the corrosion performance of weldments of a high strength low alloy(HSLA) steel in a simulated seawater environment. This steel, designated HSLA80, was developed by the United ...
Taleff, Eric M.; Green, W. Paul; Kulas, Mary-Anne; McNelley, Terry R.; Krajewski, Paul E. (Elsevier, 2005);Solute-drag (SD) creep in Class I alloys is characterized by several features. Among these is the presence of “inverse” creep transients, which are unique to these solid-solution alloys and the SD creep mechanism. Creep ...