Collocated Tunable Wavenumber Sensor/Actuators for Smart Structures

Abstract

The last actuator made it through burnout with only a minor delamination and this was 'healed' by a second isostatic pressing. The actuator was sintered using the following schedule: ramp at 5 C/min to 1185 C; hold for 3 h; cool at 1 C/min to 800 C; switch off. Unfortunately this actuator cracked during sintering. The first full-scale monitoring of weight loss during burnout was completed. This confirmed that burnout of the large actuator is going to completion. The actuator from this experiment will be the next to be sintered. The smaller actuators are being tested. The short-circuit modulus of the actuators is 15 Mpsi + or - 10%. The modulus decreases to 12 Mpsi at 1 MV/m. The room-temperature strain at 1 MV/m was 390 microstrain (unclamped) and 325 microstrain (Under 3000 psi prestress) -- note that these strains will be much larger at 5 C. The hysteresis was <1% for the all the prestress values studied (0 - 10,000 psi).

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Document Details

Document Type
Technical Report
Publication Date
Jan 07, 1994
Accession Number
ADA274709

Entities

People

  • K. Bridger
  • L. Jones

Organizations

  • Martin Marietta

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Actuators
  • Body Weight
  • Buildings And Structures
  • Circuits
  • Contracts
  • Delamination
  • Fabrication
  • Hysteresis
  • Isostatic Pressing
  • Iterations
  • Materials
  • Military Research
  • Monitoring
  • Short Circuits
  • Sintering

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials
  • Robotics and Automation.