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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
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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.

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CLC: > Mathematical sciences and chemical > Crystallography > Crystal physics
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