Recent Developments in Smart Materials and Their Engineering Applications

Abstract

Smart materials have emerged as an important area of research in modern materials science due to their ability to respond dynamically to external stimuli such as temperature, stress, magnetic fields, electric fields, light, or chemical environments. These materials possess the capability to change their physical or chemical properties in a controlled and reversible manner, making them highly valuable for advanced engineering applications. Recent developments in smart materials have significantly expanded their use across various fields including aerospace engineering, biomedical devices, robotics, civil infrastructure, and energy systems. Among the most widely studied smart materials are shape memory alloys, piezoelectric materials, magnetostrictive materials, and electroactive polymers. Shape memory alloys, such as nickel–titanium (NiTi), have the ability to return to their original shape after deformation when exposed to specific temperature conditions. Piezoelectric materials generate electrical energy when subjected to mechanical stress and are widely used in sensors, actuators, and energy harvesting systems. Similarly, electroactive polymers exhibit mechanical deformation when stimulated by electric fields, which makes them suitable for applications in soft robotics and adaptive structures.