124 New Prediction Method of Fracture Stress on Collision for PZT Flint

概要

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To examine this new concept, the present work applies the perdition method to determine the collision fatigue limit for (Pb)_<0.55> (Zr)_<0.24> (Ti)_<0.21> O_x (PZT) piezoelectric ceramics. The materials show large changes in electrical potential induced by pressure on the collision. Measurements on this type of material found a linear relationship between logarithmic electrical potential and logarithmic ideal collision energy below collision fatigue limit. On the other hand, the maximum value of electrical potential deviated substantially from the relationship at the larger collision energy (i.e., above the collision fatigue limit). Applying the large deviation from the relationship, a collision fatigue limit can be precisely determined for the PZT materials. The critical differential electrical potential (⊿V_c=+/- 4V) at collision fatigue limit can be predicted. The method holds the promise of yielding the information precisely and conveniently.
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