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Modeling and Characterization of Geometric Effects on the Performance of Rainbow and Thunder Actuators

Modeling and Characterization of Geometric Effects on the Performance of Rainbow and Thunder Actuators

          
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About the Book

Dome formation in Rainbow and Thunder actuators occurs to relieve thermal expansion mismatch stress between the metallic and piezoelectric layers during cooling from device fabrication temperatures. Accompanying this process is the generation of an internal stress profile within the devices and the development of significant tensile stresses within the surface region of the piezoelectric. These tensile stresses affect the domain configuration (ratio of c-to-a domains), and improve the 90 deg. domain wall movement response of the device in this region of the piezoelectric. This results in improved electromechanical performance compared to standard direct extensional and flextensional devices, presumably because of the contributions of stress to the non-linearity of the piezoelectric d-coefficients. 1 Interestingly, this improvement in response seems counterintuitive; a stress perpendicular to the direction of the applied electric field should impede, not contribute to 90' domain switching. Further consideration of the lower region of the piezoelectric that is under compressive stress thus appears warranted. The specified objectives of the research were to: 1. Conduct finite element and equivalent circuit simulation-based investigations to understand the effects of actuator geometry on internal stress distribution and actuator performance (displacement and load-bearing capabilities). 2. Use the results of the modeling studies to predict the processing conditions (geometry and thickness ratio) required for the fabrication of Rainbow ceramics with optimized performance.Schwartz, Robert W. and Ballato, J. and Northwang, W. D. and Laoratanakul, P.Langley Research CenterACTUATORS; PIEZOELECTRICITY; MATHEMATICAL MODELS; COMPUTERIZED SIMULATION; GEOMETRY; PERFORMANCE PREDICTION; FINITE ELEMENT METHOD; THREE DIMENSIONAL MODELS; TENSILE STRESS; ELECTROMECHANICAL DEVICES; THERMAL EXPANSION...


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Product Details
  • ISBN-13: 9781723743221
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 280 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1723743224
  • Publisher Date: 16 Sep 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 95 gr


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