Theoretical and experimental investigation of magnetostrictive composite beams

Abstract

Among novel non-destructive evaluation techniques for structural health monitoring, the magnetostrictive (MS)-tagged fiber-reinforced composites stands out as especially suitable due to: (a) distributed sensory properties, (b) non-contact damage detection, and (c) straightforward manufacturing implementation. Experimental data and mathematical modeling of a MS-tagged fiber reinforced composite beam under bending (flexural) loading are presented. A brief review of the state of the art identifies previous work on axially loaded MS composites, but finds no previous work on bending. Description of bending beam design and fabrication is followed by theoretical analysis and by the description of the experimental set-up and equipment used. Several analysis models were used. Test data, with and without applying magnetic bias field between loading cycles, is presented and results are discussed. Numerical values for the stress and strain versus magnetic flux density coefficients are given for both annealed and non-annealed cases. Piezomagnetic coefficients for the MS composite are calculated. The correlation between the results developed in the present paper for bending and previously published results for axial loading is found to be within 10% after correction factors depending on the quantity of the MS material.

Vibration suppression of FGM shells using embedded magnetostrictive layers

“…Many modern techniques have been developed in recent years to meet the challenge of designing controllers that suit the function under required conditions. There have been a number of studies on vibration control of flexible structures using magnetostrictive materials (Anjanappa and Bi, 1994;Bryant et al, 1993;Krishna Murty et al, 1997;Giurgiutiu et al, 2001;Pradhan et al, 2001). Although there have been important research efforts devoted to characterizing the properties of Terfelon-D material, fundamental information about variation in elastomagnetic material properties in a functionally graded shell is not available.…”

Review of in situ fabrication methods of piezoelectric wafer active sensor for sensing and actuation applications

“…Rearrangement of the magnetic dipoles chains of the magnetostrictive molecules through application of strong magnetic field was performed by applying a magnetic field through the thickness of the beam using a pair of magnets to apply a field of 800 Gauss. Giurgiutiu et al 29 studied the piezomagnetic response of composite beam tagged with Terfenol-D powders. The beam was 1000 mm long, and had a 100 mm by 6.5 mm cross section It had 7 layers of woven glass roving 36oz./sq.yd with Atlac 580-05 urethanemodified vinyl ester resin.…”

A Fast Adaptive Artificial Neural Network Controller for Flexible Link Manipulators

“…With recent developments in sensor/actuator technologies, many researchers have concentrated on control methods for suppressing vibrations of flexible structures using smart materials such as shape memory alloys (SMA) [33], magnetorheological (MR) materials [34], electrorheological (ER) materials [35], piezoelectric transducers (PZT) [36][37][38][39], or using positive position feedback (PPF) to suppress the vibration amplitude of nonlinear systems [40], etc.…”