Abstract
This paper investigates the bending behavior of piezoelectriclaminates under combined mechanical and electrical loads. The laminates have aPZT-5H ceramic core sandwiched between two graphite/epoxy plates. Three-pointbending tests and in situ acoustic emission measurements wereconducted on the PZT-5H sandwich laminates with a sustained applied electricfield. The results show that the PZT-5H core fractures first and thendelaminaton occurs along the tensile stressed interface between the PZTceramic and a graphite/epoxy layer. Finite element analysis was performed toanalyze the stresses in the sandwich structure and the energy release rate forinterface delamination under combined mechanical and electrical loads.Consequently, both the bending strength of the PZT core and the interfacetoughness were evaluated from the experimental data. Although the experimentaldata scatter widely, the electric field, either positive or negative, reducesthe average fracture strength of the PZT core. The average interface toughnessdecreases on increasing the magnitude of a negative electric field, while itis increased by a positive electric field.
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