Electromechanical fatigue behavior of graphite/epoxy laminate embedded with piezoelectric actuator

Shankar Mall; T. L. Hsu

doi:10.1117/12.350753

9 June 1999 Electromechanical fatigue behavior of graphite/epoxy laminate embedded with piezoelectric actuator

Shankar Mall, T. L. Hsu

Proceedings Volume 3668, Smart Structures and Materials 1999: Smart Structures and Integrated Systems; (1999) https://doi.org/10.1117/12.350753
Event: 1999 Symposium on Smart Structures and Materials, 1999, Newport Beach, CA, United States

Abstract

Fatigue behavior of graphite/epoxy laminate, having [0/+/- 45/90]_s lay-up and embedded with piezoelectric (lead zirconate-titanate, PZT) actuator, was investigated under combined mechanical and electrical cycling loading condition. The PZT was inserted into a cutout area in the two middle 90-degrees plies. Experiments involved cycling of specimens at various maximum stress levels along with the excitation of the embedded actuator from -10 V to -100 V or 10 V to 100 V, which resulted in either in-phase or out-of-phase electrically induced strain relative to the applied mechanical loading or strain. In general, PZT performed better in the out-of phase than in the in-phase electromechanical fatigue condition. The fatigue life of the embedded PZT was more than one million cycles, for the applied maximum stress levels well above its design limit in the out-of-phase electromechanical and in only mechanical fatigue conditions. The PZT failed before one million cycles during the in-phase test at the applied maximum stress equal to its design limit. Above this stress level, a sharp drop-off occurred in the fatigue life during the in-phase electromechanical cycling condition.

Citation Download Citation

Shankar Mall and T. L. Hsu "Electromechanical fatigue behavior of graphite/epoxy laminate embedded with piezoelectric actuator", Proc. SPIE 3668, Smart Structures and Materials 1999: Smart Structures and Integrated Systems, (9 June 1999); https://doi.org/10.1117/12.350753

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