Smart materials are those having one or more properties that can be significantly changed in controlled fashion by external stimuli. SMART MACHINES and SMART STRUCTURES are composed of smart materials. Smart materials has been expanded to the materias 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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