Devising a method of making actuators with reduced poling-induced tension
Hsueh, CH; Hoffmann, MJ
SENSORS AND ACTUATORS A-PHYSICAL, 2003, Band 107, Heft 1, S. 14–20
Devising a method of making actuators with reduced poling-induced tension.
Domain switching of poled dielectric ceramics in actuators induces tensile stresses in the polarization direction in both the end margin and the end termination which, in turn, result in cracking and create a major reliability problem. A method of reducing these poling-induced tensile stresses is devised in the present study. This is achieved by dividing the poled region into blocks of poled region separated by bands of unpoled region. The stress field can further be modified by changing (1) the elastic constants of the bands of unpoled region, and (2) the geometry of the interface between the poled region and the end margin from a conventional flat plane to a curved one. The numerical simulation results are presented.