Accession Number:

ADA265664

Title:

Ceramic Actuators for Smart Materials

Descriptive Note:

Final rept. 1 Jul 1991-30 Jun 1992

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Personal Author(s):

Report Date:

1992-06-01

Pagination or Media Count:

66.0

Abstract:

In earlier studies a number of phase switching systems had been explored which permit the switching of large electric polarization and the associated high elastic strain. The question to be resolved was whether these large polarization values could be repeatedly switched without associated mechanical or electrical fatigue. Early fatigue was shown to be an electrode problem and with care in electrode application, density control, grain size control and field homogeneity it was shown that full switching lifetimes with no fatigue of more than 10exp 9 cycles were achievable. In polymer-ceramic composite transducers the 13 type connectivity is highly desirable. A new theoretical approach has been made to calculate die inhomogeneous stress profiles in both piezoceramic and polymer phases. The predictions have been tested using the MRL ultradilatometer and good agreement is shown between predicted and observed strain profiles. A new type of 13 composite making use of radially poled ceramic tubes has been explored and shown to offer unusually attractive possibilities for the control of piezoelectric, elastic and electric impedance characteristics and to offer a vehicle for the new electrostrictive agile piezoelectrics.

Subject Categories:

  • Physical Chemistry
  • Polymer Chemistry
  • Electrical and Electronic Equipment
  • Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE