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Although Nitinol devices are extensively used in the medical industry, there is a fundamental gap in the amount of high-quality quantitative experimental data detailing strain localization.The numerous applications of shape memory alloys provide the motivation to understand the deformation and failure mechanisms of these materials, particularly their fatigue and fracture behavior.By using an in-situ optical technique called Digital Image Correlation (DIC), quantitative measures of strain localization in Nitinol are presented for the first time in both deformation and failure modes.
Thus, they have the properties of both metals and ceramics.
Ni –Ti alloy (Nitinol) Cu –Al –Ni alloy Cu –Zn –Al alloy Au –Cd alloy Ni –Mn –Ga and Fe based alloys The change of shape of a material at low temperature by loading and regaining of original shape by heating it, is known as shape memory effect.
The lack of adequate sensing technologies make it very challenging to measure bending of the flexible instruments, and to measure tool-tissue contact forces of the both flexible and rigid instruments during MIST.
Therefore, it requires the development of the cost effective miniature actuators and strain/force sensors.
A group of metallic alloys which shows the ability to return to their original shape or size i.e., alloy appears to have memory when they are subjected to heating or cooling are called shape memory alloys.