Micromechanical Analysis of Damping Performance ofPiezoelectric Structural Fiber Composites

摘要

Recent studies showed that the active piezoelectric structural fiber (PSF) composites may achievesignificant and simultaneous improvements in sensing/actuating, stiffness, fracture toughness and vibrationdamping. These characteristics can be of particular importance in various civil, mechanical and aerospacestructures. This study firstly conducted the micromechanical finite element analysis to predict the elasticproperties and piezoelectrical coupling parameters of a special type of an active PSF composite laminate.The PSF composite laminates are made of longitudinally poled PSFs that are unidirectionally deployed inthe polymer binding matrix. The passive damping performance of these active composites was studiedunder the cyclic force loadings with different frequencies. It was found that the passive electric-mechanicalcoupling behavior can absorb limited dynamic energy and delay the structure responses with minimumviscoelastic damping. The actuating function of piezoelectric materials was then applied to reduce thedynamic mechanical deformation. The step voltage inputs were imposed to the interdigital electrodes ofPSF laminate transducer along the poled direction. The cyclic pressure loading was applied transversely tothe composite laminate. The electromechnical interaction with the 1-3 coupling parameter generated thetransverse expansion, which can reduce the cyclic deformation evenly by shifting the response waves. Thisstudy shows the promise in using this type of active composites as actuators to improve stability of thestructure dynamic.