Dependence of Mechanical Q and Young's Modulus of Ferroelectric Ceramics on Stress Amplitude

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Abstract
In this work the effects of stress amplitude on the mechanical properties of several barium-titanate and lead-titanate-zirconate compositions were studied. The mechanical Q was found to decrease to about 13 of its low-signal value at a dynamic stress of about 1500 psi. No further decrease occurred with stress up to about 4000 psi, the limit of these tests. Young's modulus decreased by about 5% in materials used in power transducers, and by about 25% in special compositions having low coercive force. It is concluded that the mechanical quality at the highest stress amplitude is still sufficiently high so that it will not seriously affect the efficiency of a well-matched acoustic transducer.

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