Static and Dynamic Characterization of a Magnetoelectric CantileverCutting Tool

摘要

A magnetoelectric self-sensing cantilever actuator is under investigation for use as a remotely driven self-sensingactuator. The cantilever is fabricated from Galfenol and Lead Zirconate Titanate strips as a laminate composite. Anapplied magnetic field generates strain in the magnetostrictive layer, thereby creating a bending moment in thecomposite and generating an electrical signal in the piezoelectric layer. A force-deflection model and equation of motionfor the self-sensing magnetoelectric material in cantilever configuration is developed in this paper. An equivalent massand stiffness matrix derived for the cantilever in terms of generalized coordinates is used to predict the bending behaviorof the cantilever in its linear range of operation. In addition, the electrical boundary condition of the piezoelectric layer isvaried to determine its influence on the actuation properties of the cantilever tool. Cantilever specimens measuring40mm x 20mm and 20mm x 10 mm are excited using a remote magnetic field of up to 2.8x10~4A/m and free tipdisplacements of 200μm and 60 μm are observed, respectively. The model predicts the slope of the magnetic field/tipdisplacement curve with an error of 7% and 33%, respectively. The sensing current generated by the smaller specimen is5x10~(-7)A.