Accession Number:

ADA261932

Title:

Micro-Mechanics of Electrostrictors for Sonar Transducers

Descriptive Note:

Quarterly rept. 1 Sep 1992-30 Nov 1992

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB

Report Date:

1992-11-01

Pagination or Media Count:

27.0

Abstract:

This study focuses on the performance of electrostrictor-based actuators for Navy-type sonar transducers, being synergistic with the parent program Relaxor Ferroelectrics for Electrostrictive Transducers and the three- year AASERT project on the classification of electrostrictors. As stated, electrostrictors have been classified into Types I-IV, analogous to piezoelectrics. Based on the following requirements for Navy Sonar transducers 1 Large E-field induced strains or 0.3, 2 Operating temperature range 0 - 30 C, 3 Minimal strain-E-field hysteresis or 1 kHz, and 4 Low heating due to dielectric losses, the performance of the four types of strictors have been summarized. From the results, it is clearly evident that Type-I strictors offer superior overall performance. What is not yet clear is how such materials will perform under pre-stress and high-frequency drive conditions. In order words what are the micro-mechanical limitations an ultimate reliability of these materials In this quarterly report the remainder of the proposed PMN compositional modifications have been investigated for use in SONAR transducers. Additionally, multilayer actuator studies utilizing compositions developed in the parent program will be discussed

Subject Categories:

  • Acoustic Detection and Detectors
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE