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Effects of electric fields on the bending behavior of PZT-5H piezoelectric laminates

Authors Cheng, Jinquan
Qian, Caifu
Zhao, Minghao
Lee, Shi Wei Ricky
Tong, Pin
Zhang, Tong-Yi
Issue Date 2000
Source Smart materials and structures , v. 9, (6), 2000, p. 824-831
Summary This paper investigates the bending behavior of piezoelectric laminates under combined mechanical and electrical loads. The laminates have a PZT-5H ceramic core sandwiched between two graphite/epoxy plates. Three-point bending tests and in situ acoustic emission measurements were conducted on the PZT-5H sandwich laminates with a sustained applied electric field. The results show that the PZT-5H core fractures first and then delamination occurs along the tensile stressed interface between the PZT ceramic and a graphite/epoxy layer. Finite element analysis was performed to analyze the stresses in the sandwich structure and the energy release rate for interface delamination under combined mechanical and electrical loads. Consequently, both the bending strength of the PZT core and the interface toughness were evaluated from the experimental data. Although the experimental data scatter widely, the electric field, either positive or negative, reduces the average fracture strength of the PZT core. The average interface toughness decreases on increasing the magnitude of a negative electric field, while it is increased by a positive electric field.
ISSN 0964-1726
Rights Smart Materials and Structures © Copyright (2000) IOP Publishing Ltd. The Journal's web site is located at
Language English
Format Article
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