Accession Number : ADA137435

Title :   Temperature Effects of Cement Joints in Ceramic-Stack Resonators.

Descriptive Note : Final rept. Apr-Dec 82,

Corporate Author : NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s) : Goodhart,C L

PDF Url : ADA137435

Report Date : Jun 1983

Pagination or Media Count : 57

Abstract : A temperature-related performance degradation has been observed in certain sonar transducers that employ ceramic-stack 33-mode resonators that contain joints. This study sought to identify the cause of this performance degradation and to determine resonator design or assembly methods that limit or eliminate this degradation. Experimental and computer modeling results show that the performance degradation is extreme for little or no final stress bias on the resonators and does not appear to be affected by the initial stress bias (the bias during cement curing). The degradation results from a temperature sensitivity of the stiffness of the cement/electrode joints. A high final stress bias of 28 million Pa essentially eliminates the performance degradation. (Author)

Descriptors :   *Acoustic resonators, *Joints, *Piezoelectric transducers, Stiffness, Ceramic materials, Degradation, Cements, Epoxy composites, Stresses, Bias, Sonar transducers, Stacking, Thermal expansion, Electrodes, High pressure, Curing, Temperature sensitive elements

Subject Categories : Electrical and Electronic Equipment
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE