Dissertation > Excellent graduate degree dissertation topics show

Research on Mechanical Behavior of the Photonic Crystal Thermal Control Coating

Author: LiTianLong
Tutor: ZhangGuangYu
School: Harbin Institute of Technology
Course: Mechanical and Electronic Engineering
Keywords: photonic crystal nano-indentation finite element numerical simulation mechanical behavior
CLC: O73
Type: Master's thesis
Year: 2012
Downloads: 26
Quote: 0
Read: Download Dissertation

Abstract


In the region of near-earth space, because of the high-speed friction, thecovering of the spacecraft sustains extremely high temperatures. It is an importantproblem to improve the efficiency of the reflection. Because of the total emission, thephotonic crystal is a new-style thermal control coating material. The material as athermal control coating must sustain combined loads. The research of the mechanicalbehavior has importance in improving the material property and optimizing thepreparation method.The most photonic crystal studies are about preparation methods, opticalproperties and applications. There is little about the mechanical property. Thephotonics crystal is consisted of two different kinds of material, and the internalstructure is complex, thus the properties of the photonic crystal are extremelydifferent from the solid material. The similar research is about the properties of foammetal. The pore of the photonic crystal is in the scale of nanometer, thus, themechanical properties between the photonic crystal and the foam metal are in greatdiversity. In order to research the mechanical properties of the photonics crystal, thenanoindentation, finite element simulation and numerical calculating are used. Theresearch contents are as follows:First, in order to prepare the photonic crystal for the nanoindentation experiment,this article prepares the colloidal templates of polystyrene on the substrate materialby the cant self-assembly method, and then, the photonic crystal on the colloidaltemplates by the electrodeposition method. According to the research of theappearance characteristics, the best experimental parameters of preparation can beidentified.Second, And then, the mechanical properties are researched by the math model.The influencing factors of the mechanical properties are discussed. And thecomputational formulas of the modulus of elasticity, shear modulus and bulkmodulus are obtained. And then, the mechanical properties are researched by thefinite element method. The variation of the hardness and elastic modulus caused bythe indentation depth are discussed.Finally, the indentation force as a function of the indentation depth is researchedby the nanoindentation method. Using the Oliver-Pharr method to research therelation between the indentation force and the indentation depth, the variation of thecontact stiffness, hardness and elastic modulus caused by the diameter of pore andthe indentation depth are discussed, respectively. Comparing with the numerical solution, the math model and finite element model can be verified,repectively.

Related Dissertations

  1. The Setting Bases of Working Pressure in LNG Systems and Orthogonal Experiment Design of Heat Exchangers,TQ051.5
  2. Research on the Mainframe System of Powder Mixed EDM and the Craft Experiment,TG661
  3. Study on Springback of High-Strength Steel Stamping,TG386
  4. Numerical Simulation and Experiment on Hydroforming of Cups with Controllable Radial Pressure,TG386
  5. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  6. EDM Electrode Wear Mechanism and Control Research,TG661
  7. Research on the Structure and Characteristics of Permanent Magnetic Coupling,TH139
  8. Finite Element Analysis and Structure Optimal Design for Combined Seal at Normal Temperature and Low Temperature,TH136
  9. Numerical Simulation of Film Cooling in Turbine Cascade with Non-Axisymmetric Endwall Method,V231.3
  10. High Speed Aerodynamic Convection and Coupled Heat Transfer of Complicated Bodies,V215.4
  11. The Analysis on Characteris of Vibration Source about Vertical Vibration of Surrounding Environment Induced by Rail Transit,U211.3
  12. Simulation Analysis on Temperature Stress of RCC Arch Dam and Its Construction Joints Design Research,TV642.2
  13. Simplified Analysis of Semi-Rigid Steel Frames under Vertical Loading,TU391
  14. Based on Nonliner Finite Element Analysis of the Infilled Wall Frame Structure,TU323.5
  15. Study on the Heat Transfer Characteristics of Particle Cluster in Circulating Fluidized Bed,TK124
  16. Numerical Simulation of SNCR Process of a 600MW Utility Boiler,TK222
  17. Numerical Simulation of Biomass Direct Reburning,TK16
  18. Numerical Simulation on Pulverized Coal Combustion Process in a 670T/H Tangential Firing Furnace,TK224.11
  19. Numerical Simulation on the Combustion Process in the Furnace of a 1000MW Lignite-Fired USC Boiler,TK224.11
  20. Study on Gas-Solid Two-Phase Flow in Spouted Beds,TK173
  21. Experimental Study and Numerical Simulation on Aerodynamic Field of Tangential Bias Swirl Burner,TK223.23

CLC: > Mathematical sciences and chemical > Crystallography > Crystal physics
© 2012 www.DissertationTopic.Net  Mobile