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Piezoelectric Ceramics with Functional Gradients: A New Application in Material Design
Author(s) -
Wu Carl C. M.,
Kahn Manfred,
Moy Walter
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb07951.x
Subject(s) - piezoelectricity , bar (unit) , bimorph , materials science , ceramic , composite material , bending , piezoelectric coefficient , voltage , geology , electrical engineering , engineering , oceanography
Internal strain amplification can be utilized in piezoelectric ceramics to obtain relatively large displacements. The monomorph described in the present work is a bending bar made from a single piece of material into which a smooth gradient of piezoelectric activity is introduced. The application of a voltage then causes the bar to bend due to the differential stresses that are induced. These are relatively uniformly distributed and do not peak in the center as in a conventional bimorph. Significantly increased life and reliability can then be achieved.