Magnetostrictive composites have found increasing use as a tagging agent for structural integrity monitoring. A simple magnetic model based on Heisenberg–Weiss theory is put forth that provides guidance as to the physical parameters that govern the magnetic response of a Terfenol-D impregnated composite specimen in tension. Further, the model provides an effective analytic parameterization of the magnetic response, resulting from unidirectional tension, and affords estimates of these parameters.
Conventional non-destructive evaluation (NDE) methods are not very effeclive in monitoring the material conthtions of advanced composite and adhesive joints. A technology that has been proposed to enhance the inspectability of advanced composites is the particle tagng technique. Two theoretical models were recently proposed to characterize the damic behavior offerromagnetic and magnetosttictive tagging particles. These theoretical models concerning the development of an active tagging technique with embedded ferromagnetic and magnetostrictive particles and magnetic excitation are now experimentally verified. The experimental results ofthe active particle tagging shows a variation in the dynamic response of the specimens when defects and/or damage are presents. The sensory signature from a tagged polymer is extracted as a result ofthe interaction between the embedded particles and their host matrix. A study of various types of composites and tagging particles for passive and active tagging vas performed. Experimental validation ofconcepts for tagging ofstmctural materials for on-site inspection prior to installation have also been explored. The on-site particle tagging inspection has been verified on laboratory specimens obtained from industiy and vas sho to be very efficient.
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