Development of a Shape-Memory-Alloy-Based Overheating Protection System

Abstract

Shape Memory Alloys (SMAs) are a class of metallic alloys that have the ability to return to their original shape after being deformed. NiTi (nickel–titanium) alloy a type of shape memory alloy that possesses unique properties such as remembering its shape, biocompatibility, and super-elasticity. These SMAs have the ability to deform when heated and regain their original shape when allowed to cool. The disadvantage of a fuse is that it can only be used once. By replacing a wire that melts with a NiTi shape memory alloy, we can turn it into a switch that opens when an excessive current (which leads to an increase in temperature of the wire) is applied. Magnets keep the circuit closed. When the wire heats up, the spring-shaped coil shrinks, which opens the circuit. The circuit can then be closed manually once the problems are rectified.

Keywords

• shape memory alloys (SMAs)
• overheating
• deformation
• electricity conductance analysis