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<title>Bonding stresses between piezoelectric actuators and elastic beams</title>

1997; SPIE; Volume: 3041; Linguagem: Inglês

10.1117/12.275691

1996-756X

Wolfgang Seemann, Kai Wolf, Alexander Straub, Peter Hagedorn, Fu‐Kuo Chang,

Structural Analysis of Composite Materials

A beam with piezoceramic elements bonded to the beam's top and bottom surfaces is investigated. Simple pin-force models allow the user to predict the deformation of the beam very well for the static case. As the pin-force models are simple they are well suited for active control algorithms of such structures. In experiments, however a debonding of the ceramics can occur due to high stresses in the bonding layer. The simple pin- force models are not able to predict these stresses. Therefore, a finite element (FEM) calculation is used to estimate the shear and normal stresses. As could be expected a stress concentration occurs at the ends of the ceramics. The maximum stress obtained by the FEM calculations strongly depends on the discretization. The analysis shows that these stresses are moderate in the static case but may be very high if the structure is excited in resonance. In the future a more sophisticated beam model will be developed to get analytic approximations of the interface stresses due to the interaction between the ceramics and the beam.