Accession Number : ADA279255


Title :   Materials for Adaptive Structural Acoustic Controls


Descriptive Note : Annual rept. 1 Feb 1993-31 Jan 1994


Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB


Personal Author(s) : Cross, L. E.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA279255


Report Date : 31 JAN 1994


Pagination or Media Count : 211


Abstract : The research goals of this ONR sponsored University Research Initiative entitled 'Materials for Adaptive Structural Acoustics Control' relate directly to the sensing and actuating material which must be integrated to function in adaptive control of acoustic structures. This report documents work in the second year of the program and for convenience the activities are grouped under the headings General Summary Papers, Materials Studies, Composite Sensors, Actuator Studies, Integration Issues, Processing Studies, and Thin Film Ferroelectrics. The general papers cover a new comprehensive description of ferroelectric ceramics and their applications, analysis of high temperature piezoelectric sensors and the possible application of nonlinearity in enhancing the 'smartness' of ceramics and composites. Scale effects on ferroics are of increasing interest and the manner in which nano-scale polar regions control the properties of relaxor ferroelectrics is again emphasized.


Descriptors :   *COMPOSITE MATERIALS , *THIN FILMS , *ELECTRICAL PROPERTIES , *COMPOSITE STRUCTURES , *CERAMIC MATERIALS , *ACOUSTIC EMISSIONS , *ACOUSTIC DETECTORS , *FERROELECTRIC MATERIALS , POLAR REGIONS , TEMPERATURE , VIBRATION , MICROSTRUCTURE , ACTUATORS , FATIGUE(MECHANICS) , TRANSDUCERS , ACOUSTICS , WEAR , PIEZOELECTRIC MATERIALS , LEAD TITANATES , ELECTRODES , CRACK PROPAGATION , ACOUSTIC PROPERTIES , ELECTROSTRICTION , STRAIN(MECHANICS) , THESES , HIGH TEMPERATURE , ADAPTIVE CONTROL SYSTEMS , FATIGUE LIFE , POLYMERS , PROCESSING.


Subject Categories : ELECTRICAL AND ELECTRONIC EQUIPMENT
      CERAMICS, REFRACTORIES AND GLASS
      LAMINATES AND COMPOSITE MATERIALS
      ACOUSTIC DETECTION AND DETECTORS
      ACOUSTICS
      ELECTRICITY AND MAGNETISM


Distribution Statement : APPROVED FOR PUBLIC RELEASE