Dissertation > Excellent graduate degree dissertation topics show

First-principle Calculations of Piezoelectric Properties and Research on Damping Model of Piezoelectric Effect-based Composites

Author: WangJiaZuo
Tutor: HuangZhiXiong
School: Wuhan University of Technology
Course: Composite materials science
Keywords: First-principles Piezoelectric properties Damping energy ANSYS
CLC: TM282
Type: Master's thesis
Year: 2010
Downloads: 139
Quote: 0
Read: Download Dissertation

Abstract


Lead zirconate titanate (PZT) having a perovskite type structure is a binary continuous solid solution of PbZrO3 and PbTiO3. PZT piezoelectric ceramic having a high phase transition field strength, the energy storage density and a low dielectric constant, dielectric loss, and used for production of the capacitor and the transducer, and is widely used in the recent damping composite material. Present their research focused on multi-composites and piezoelectric dielectric characterization of few studies on the establishment of the piezoelectric material performance of electromechanical coupling intuitive characterization of its the force electric conversion model; PZT solid solution with unit PbZrO3 anti-ferroelectric body phase boundary MPB (morphotropic phase boundary, MPB) near nature approximation. This paper based on the first principles of the density functional theory, the use of open source software package ABINIT universal quantum chemical calculations study PbZrO3 crystals (orthorhombic system, space group Pbam) piezoelectric properties; through finite element analysis software ANSYS module piezoelectric ceramic materials commonly used in the form of multi-physical field - electromechanical coupling field analysis, the strain and the output voltage characteristics provide the basis for the piezoelectric material electromechanical energy conversion model further establish. Select the the truncated kinetic energy 8Hartree, k point 4 × 4 × 4Monkhorst-Pack grid sampling result of convergence, first-principles calculation the get energy band diagram, the total density of states, the results show that the PbZrO3 of the bottom of the conduction band and the valence band top are R point in simple Brillouin zone (Brillouin zone), with semiconductor crystals for the bandgap 0.1ev the narrow gap - using the local density approximation (local density approximation, LDA), and compared with the experimental values ??low bandgap value; strong orbital hybridization between d and p electrons of the O atoms of the Zr atom, a short-range repulsive force is suppressed so that the piezoelectric be stabilized. Further calculation to obtain the elastic tensor C11 0.5107036 × 102GPa, piezoelectric constant E33 = -0.00580912 C/m2 symmetry matches the inherent polarization of the calculated results with the space group Pbam; show a higher material hardness, good piezoelectric properties. The calculation method has preferably may be dependent, to a certain extent on the interpretation of the microscopic mechanism of the calculation result produced by the piezoelectric properties. ANSYS direct coupling simulation analysis, intuitive description of the piezoelectric properties of piezoelectric ceramic thin film materials: one-way vibration mode, the the film maximum displacement of 0.255 × 10-10m in the metal plate is located in the ceramic thin film interface, the maximum voltage 58.51mA surface displacement is proportional to the voltage on the film, and thus constitute a composite system power electric conversion mechanisms foundation. This study makes it possible interpretation of the composite system energy dissipation mechanism fundamentally.

Related Dissertations

  1. Analysis and Study of Abutment Stability in Concrete High Arch Dam by Three-Dimensional Nonlinear Finite Element Method,TV642.4
  2. The Effect of Current Density and Electric Field on Ni and Its Alloy Electrodeposition for Copper Crystallizer,TQ153.2
  3. Broken walnut shell force testing and virtual prototype design of the main components of walnut sheller,S226.4
  4. Research on a Fire-fighting Shell for Towers,TU892
  5. Bearing Capacity of Cast-in-place Piles in the Karst Region of Yichun, Jiangxi,U213.1
  6. First-principles Study on the Influence of Doping on the Strength of Super-hard Materials,O469
  7. Structure Analysis and Optimization Design for 150 Tons Flat-Top Crane,TH213.3
  8. The Surrounding Rock Monitoring and Finite Element Simulation of Subway Tunnel,U455.43
  9. Numerical Simulation Research on Optimal Milli-second Delay Time with Many Free Surfaces Hole by Hole Blast,TD235
  10. Research of FBAR Temperature Sensor,TP212.11
  11. The Study on the Influnce of Sub-splits Wire’s AC Corona Characristics under Different Climatic and Environmental Conditions,TM851
  12. Three-dimensional Thermal Simulation and Structure Design of Phase Change Access Random Memory,TP333.8
  13. Welding Research and Application of sump pumps based on the finite element analysis software,TG457.2
  14. Simulation of infrared multispectral images,TP391.9
  15. Fabrication of Microscale Ordered-reinforced Composite and Its Mechanical Characterization,TB33
  16. Research and Experiment of Partial Mould Thermal Field Analysis Based on Induction Heating,TQ320.66
  17. Synthesis of Ag / Al 2 O 3 powder composites research,TB383.3
  18. Pipeline circumferential excitation calculation method of magnetic flux leakage,TG115.284
  19. Pipeline Leakage Detection Technology within the magnetic axis,TH878.3
  20. Real-time medical ultrasound puncture navigation positioning and soft tissue modeling,R318.6
  21. Thermal conductivity of the power module,TN386

CLC: > Industrial Technology > Electrotechnical > Electrical materials > Electric and ceramic materials > Piezoelectric ceramics
© 2012 www.DissertationTopic.Net  Mobile