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3D woven ceramic matrix composite mechanical behavior

Author: ChangYanJun
Tutor: JiaoGuiQiong
School: Northwestern Polytechnical University
Course: Solid Mechanics
Keywords: Tilt within the lock -type three-dimensional woven Ceramic matrix composites Holes Damage evolution Unit cell model Fabric Microstructural Parameters Elastic properties
CLC: TB301
Type: Master's thesis
Year: 2006
Downloads: 340
Quote: 5
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Abstract


Tilt within the lock-type three-dimensional woven ceramic matrix composites improved interlaminar fracture toughness and damage tolerance has huge potential, materials with high specific strength, high specific modulus, high temperature resistance, ablation, antioxidant, and low-density and other characteristics, high thrust to weight ratio aircraft engines, rocket engines, and other fields has broad application prospects. The three-dimensional woven fabrics profiling ability, forming profiled textile preforms, which bodes well inclined inner lock-type three-dimensional woven ceramic matrix composites may be applied in more fields. Especially inclined inner lock-type three-dimensional machine for 3D woven ceramic matrix composites woven ceramic matrix understanding of the mechanical behavior of the composite also just in its infancy, also need to develop an understanding of the process of a gradual understanding. The in-depth study of the mechanical properties of three-dimensional braided composite material design and process improvements based on the prerequisite material toward engineering applications. Based on this understanding, the study of the mechanical behavior of three-dimensional woven composite. Of this study include: 1. Use of the averaging method tilt within the lock-type three-dimensional woven ceramic matrix composite analysis of the elastic properties of three-dimensional micromechanical model to predict the elastic properties of the material. Two geometrical models were established for the material of the woven structure, the model considers the inclined inner lock type three-dimensional woven ceramic matrix composites by the straightness of the bending of the fiber bundle and the weft fiber bundle, the fiber bundle cross-sectional shape, and adjacent to the elastic properties of the voids between the fiber bundles and Process. Assumptions based on laminated plate theory and two Aeromonas strain state nine elastic constants of the material the derivation calculation results show that the value is very close to the theoretical predictions of the two methods. Calculation results with the experimental values ??consistent micromechanics show that the proposed model is reasonable, can the optimal design of woven ceramic matrix composites provide a valuable reference. Closer to the actual situation of the material due to the the model fiber bundles of fiber bundles Straight fluctuations form of fiber bundles Straight model predictions more accurate results than the fiber bundles curved bar model. Using the elastic properties of the proposed prediction model analysis of the elastic properties of material fabric Microstructural Parameters. The geometric fabric structure parameters and porosity research, fiber volume fraction, the relationship of the flex rate, given the relationship between the elastic properties of the fiber volume fraction, buckling ratio and porosity parameters. Fiber volume content and weaving geometry related nonlinear decreases with increasing fiber volume content of the longitudinal tensile modulus of elasticity of the material, this is because the tilt within lock-dimensional machine unique woven structure of the woven composite material, fine

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