As known, the electrical induced strain of conventional piezoceramic materials is limited by 0.12 % (2 kV/mm), which
often requires strain transformation designs, like levers, in order to meet application needs. High fabrication accuracy
and low tolerances are crucial points in mechanical manufacturing causing high device costs.
Therefore, we developed a piezoelectric composite actuator with inherent stress - strain transformation. Basically,
piezoceramic sheets are laminated with spring steel of a certain curvature, which can be realised by a comparatively
simple fabrication technique. The working diagram of these composite bow actuators showed a high level of
performance adaptable to a wide range of applications. The authors established the value chain covering the
piezoceramic formulation, the processing technology and the design in view of optimum system performance.
The paper presents an overview of the design principles, simulation and various aspect of fabrication technology
including lamination, sintering and polarization. The new devices are useable in different sectors, for example in
automotive industry as solid state transducer or as the active part in injectors. Moreover, the composite bow actuators
may find application in microsystems technology, micro optics and micro fluidics as well as vibration dampers. The
composite bow actuators can be used as single component transducer, as well as multi-bow actuator in series or parallel
combination on demand.