Abstract
The effect of the phase of harmonic actuation on the stress intensity factor(SIF) for delaminated composites with embedded piezoelectric (PZT)layers is studied. A plane-stress finite-element model using a four-nodequadrilateral element having one active degree of freedom per node isdeveloped. A fracture mechanics-based approach, which uses a general purposecomputational scheme to obtain the strain energy release rate and the SIFdue to delamination in orthotropic laminated composite, is employed.The performance of the finite-element result is first validated using theresults reported in published literature. A composite double cantileverbeam specimen with three embedded PZT layers around the tip of thedelamination is considered for actuation. Numerical simulations on the effects ofactuation voltage and phase on mode-II SIF are carried out. The results showthat for a specified voltage amplitude to the embedded actuators, theactuation phase can have a significant influence on delamination growth.
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