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Damping properties of ceramic matrix composites research

Author: TangBin
Tutor: SunZhiGang
School: Nanjing University of Aeronautics and Astronautics
Course: Mechanical Design and Theory
Keywords: Ceramic matrix composites Energy dissipation Damp Micromechanics Finite Element Method Affect
CLC: TB332
Type: Master's thesis
Year: 2009
Downloads: 104
Quote: 1
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Abstract


Ceramic matrix composites (CMC) has excellent high temperature performance, is the development of high-performance aerospace vehicles ideal alternative materials . Vibration is an important factor leading to structural damage , and improving the damping material itself is a vibration suppression structure of the most effective ways . Therefore, to CMC damping theory and methods of quantitative research has important practical significance. In this paper, micromechanics , derived CMC in Canada - the uninstall process forward, reverse slip length , and then get the friction energy dissipation and the maximum strain energy formula. The damping is calculated with the corresponding combination of the energy developed ceramic matrix composite unidirectional energy dissipation coefficient is calculated , and the calculated results with the literature compared to prove the validity of this calculation method . On this basis , discussed the main material parameters on damping performance, results showed that reducing the interfacial shear stress and fiber volume content can significantly improve the damping performance. Because shear lag model represents the voxel contains only a single fiber , difficult to describe the interaction between adjacent fibers . In order to study complex material microstructure on damping effect , this paper establishes a three-dimensional representation of CMC voxel model is developed based on the finite element method of the material energy dissipation coefficient calculation methods. By comparing the results with theoretical calculations to verify the material using the finite element method to calculate the energy dissipation coefficient is feasible. On this basis , the material arrangement of fibers in different modes exhibit damping properties were analyzed , the results show that the fibers are arranged diagonally damping material has the best performance. In the above work , based on the one-way ceramic matrix composite damping calculation methods and longitudinal vibration rod combined study CMC structural damping method of analysis. CMC derived longitudinal rod in the event of structural vibration energy dissipation coefficient calculation formula , the calculation results with the literature results are close . On this basis , analyzes the loading frequency damping properties of the material .

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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