Abstract
The effect of dynamic and static stress on the mechanical loss of a transducer ceramic has been measured. Static stress was applied axially to a radially polarized tube of lead zirconate titanate measuring 2.54 cm long by 2.54 cm o.d. by 0.317 cm wall thickness. Dynamic stress was superimposed on the static stress by coupling the ceramic tube to an ultrasonic solid horn driver operating at 18.1 kHz. The mechanical loss of the ceramic: was determined by measuring the combined Q factor of the ceramic and its support. A correction for the support losses was obtained by substituting a LoW-loss brass tube for the ceramic. Initially, a static compressive stress of 3000 psi reduced the mechanical Q of the ceramic from 250 to 40. A dynamic stress of 2000 psi peak, applied for 15 sec, further reduced the Q factor from 40 to 16. Upon removing the dynamic stress, the Q factor gradually increased to 65. Surface temperature rise did not exceed 5°C. [Supported by Office of Naval Research, Code 468.]
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