Abstract
Piezoelectric ceramics are applied to sensors and actuators because of quick response, high efficiency of energy conversion, generation of large force and so on. Therefore, since they are used in situation subjected to cyclic loading in products, it is concerned that change of material properties and cracks due to long-term use may affect measurement as sensors and control of products. In the present paper, focused on the development of internal damage due to compressive fatigue loading and fatigue life of piezoelectric ceramics, formulation to predict fatigue life and damage development with high accuracy was conducted. So, considering the applicability of the formula which has been proposed for metal materials to fatigue life prediction of piezoelectric ceramics, a new damage evolution equation using a fatigue life were proposed. Finally, its validity was examined by comparing the predicted results with the experimental results. As a result, both the internal damage development and fatigue life were able to be expressed.
