NONSYMMETRIC DEFORMATION-BEHAVIOR OF LEAD-ZIRCONATE-TITANATE DETERMINED IN BENDING TESTS

Soft lead zirconate titanate (PZT) ceramics exhibit a nonsymmetric def ormation behavior, where the tensile strains exceed the compressive st rains for a given stress level. This phenomenon affects the strains in bending tests. In addition to the normally determined bending strain that is measured by the curvature of a specimen, an additional length extension occurs that can be used as a high-sensitive indicator for th e occurrence of the nonsymmetric behavior, Furthermore, it will be sho wn that the pure tensile and compression behavior may be derived from bending tests.