Delamination Detection of a Laminated Beam Using Magnetostrictive Composite Sensor and Actuator

Abstract

This article presents an analytical dynamic model to study the feasibility of sensing a delamination embedded in a cantilever laminated composite beam, which is bonded with an integrated or distributed magnetostrictive layer. The model that includes parameters characterizing a delamination is developed using the classical beam theory and the assumption of constant peel and shear strains through the bond line thickness. A movable sensing and actuation coil is employed to excite the beam system and then to measure the magnetic flux passing through the sensing and actuation coil. Two types of moveable sensing and actuation coil, namely integrated sensing and actuation coil and separated sensing and actuation coil, are introduced in this investigation. Using the present model, the magnetic flux passing through the coil is predicted. Thus, by monitoring the difference of the predicted magnetic flux passing through the coils which encircles the beams with and without a delamination, the presence, location, and size of the delamination embedded in a laminated composite beam will be identified. Finally, a numerical study is conducted to investigate the influence of major parameters on delamination detection sensitivity, and a comparison of the first-and third-order frequencies between the present analytical and finite element analysis models is carried out to verify the present analytical model.KEY WORDS: analytical model, delamination detection, magnetostrictive composite beam, movable sensing and actuation coil (MSAC).

Damage detection of unidirectional carbon fiber–reinforced laminates with embedded magnetostrictive particulates: A preliminary study

“…A dilemma with delamination is finding a way to discover when a void has developed without disassembling the laminate and studying the individual plies. A vast amount of research has been conducted to develop new ways of testing and locating delaminations in composite laminates (Chu and Yum, 2001;Petculescu et al, 2007;Tan and Tong, 2007). For example, modally selective, low-frequency, antisymmetric Lamb-wave transducers were affixed to composite specimens to determine the size and location of previously known, embedded damages.…”

Detection of damage precursors with embedded magnetostrictive particles

“…Experimentally, the feasibility of embedded MS particles for detecting large-scale damage such as voids and delaminations in composite laminates has been well established (Calkins et al, 2007; Myers and Anjanappa, 2008; Tan and Tong, 2007). Analytical and numerical models also exist to characterize the response of MS particles with respect to external magnetic field or load (Calkins et al, 2007; Carman and Mitrovic, 1995; Dapino et al, 2000, 2002; Datta et al, 2008; Myers et al, 2012; Zhou et al, 2013).…”