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The authors have performed static compression tests on lead zirconate titanate (PZT) ceramics, and the variation in material properties and the development of internal damage in these materials during compression tests have been clarified. In the present study, the development of internal damage was used to formulate an evolution equation for a damage variable on the basis of continuum damage mechanics. On the other hand, the variation in material properties was related to the damage variable, and thus was used to formulate a material function of the damage variable. In the present paper, the elastic coefficient was newly evaluated from stress-strain relations in order to describe stress-strain curves, and the dependence of the elastic coefficient on the evaluation method used was discussed. Using the material functions and damage evolution equation, stress-strain relations for static compression tests were simulated, and the validity of the formulations was verified by comparing their results with experimental results.

Formulation for Internal Damage and Variation in Material Propertiesof Piezoelectric Ceramics under Static Compressive Loading