Smart materials are those having one or more properties that can be significantly changed in a controlled fashion by external stimuli. SMART MACHINES and SMART STRUCTURES are composed of smart materials. Smart materials have been expanded to the materials that receive, transmit, (or)process a stimulus and respond by producing a useful effect that may include a signal that the materials are used up on it., smart materials are an answer to many contemporary problems. In a world of diminishing resources, they promise increased sustainability of goods through improved efficiency and preventive maintenance. In a world of health and safety threats, they offer early detection, automated diagnosis, and even self-repair.
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