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Proceedings Paper

Deformation and strength behavior of a soft PZT ceramic
Author(s): Dietrich Munz; Theo Fett; Stefan Mueller; Gerhard Thun
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Paper Abstract

Nonsymmetric deformation in tension and compression was measured for a PZT-ceramic. Besides direct measurements in tension and compression tests a method to obtain the nonsymmetric deformation from bending tests was developed. Large differences in strength between tensile and bending tests were found and related to the nonlinear stress distribution in the bending bars and to the statistical size effect. The deformation behavior of PZT-ceramics is mainly investigated under compressive load. Non-linear stress- strain curves were observed and interpreted by domain switching processes. Early results on electroceramics were reported by Subbarao et al. for polycrystalline barium titanate. From these results Subbarao et al. concluded that the Young's modulus would be different in tension and compression. A more detailed analysis of their data shows significant plastic strain contributions in tension and negligible compressive plastic strains, i.e. a non-symmetry in plastic strains. This behavior must have consequences on strength in bending bars due to non-linear stress distribution.

Paper Details

Date Published: 24 July 1998
PDF: 12 pages
Proc. SPIE 3323, Smart Structures and Materials 1998: Mathematics and Control in Smart Structures, (24 July 1998); doi: 10.1117/12.316289
Show Author Affiliations
Dietrich Munz, Forschungszentrum Karlsruhe GmbH (Germany)
Theo Fett, Forschungszentrum Karlsruhe GmbH (Germany)
Stefan Mueller, Forschungszentrum Karlsruhe GmbH (Germany)
Gerhard Thun, Forschungszentrum Karlsruhe GmbH (Germany)

Published in SPIE Proceedings Vol. 3323:
Smart Structures and Materials 1998: Mathematics and Control in Smart Structures
Vasundara V. Varadan, Editor(s)

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