Shape recovery of the of nickelide titane plate

Shape memory alloys such as titanium nickelide are currently used in different fields of engineering, construction, and medicine, due to their unique ability to recover significant inelastic deformations upon heating. Titanium nickelide plates as structural elements or medical devices are exposed to complex temperature and force impacts during operation, which leads to a change in the stress-strain state of the material. For example, a plate rigidly clamped on one side significantly changes the surface curvature during thermal cycling under load or as a result of heating after preliminary plastic deformation. Similar exposures are implemented in the devices in which the plate is used as a sensitive element, for example, temperature sensors, electrical contacts, smart ailerons, etc. When designing these elements, it is important to take into account changes in such deformation parameters as curvature, deformation, and shape recovery coefficient. The lack of information on those parameters is observed for titanium nickelide plates. We present the results of the experimental study of the shape reduction of a titanium nickelide plate both during isothermal unloading after plastic deformation and during thermal cycling under the impact of a constant bending force. It is shown that plastic deformation of the plate under isothermal conditions with an increase in the initial radius of the curvature by 3.35 times leads to an increase in the curvature by 4.83 times after pseudoelastic unloading. It is shown that the shape memory effect after isothermal bending of a rectangular titanium nickelide plate increases as the prescribed radius of the curvature decreases. Moreover, the curvature under constant load changes during thermal cycling in a complex way. The results of the study can be used in designing devices based on titanium nickelide plates.

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