<title>Passive and active tagging of reinforced composites for in-process and in-field nondestructive evaluation</title>

Abstract

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.

Experimental fabrication and nondestructive testing of carbon fiber beams for delaminations using embedded Terfenol-D particles

“…Chen and Anjanappa (2006) explored a variation in the sensing circuit setup and developed a single-sided sensing apparatus, which improves the practicability of using this method. Giurgiutiu et al (1996) experimentally validated that there was a variation in the sensing signal when a delamination is present. Tan and Tong (2006) also conducted an experimental investigation using magnetostrictive patches for health monitoring.…”