The Prediction and Analysis of Elastic Properties for the 3D Orthogonal C/C Composite
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摘要: 根据三向正交C/C复合材料的细观结构,建立典型单胞模型,运用均匀化法预测了材料的9个工程弹性常数,与试验值误差较小。采用预测的弹性常数对三向正交C/C复合材料开孔板的拉伸力学行为进行有限元模拟,得到的孔边应变与试验值吻合。讨论了该材料偏轴向弹性性能,分析了组分性能对材料弹性性能的影响。材料主方向拉伸模量主要由纤维控制,剪切模量由基体控制,当偏轴角为45°时,面内剪切模量转为纤维控制。Abstract: The unit cell model for predicting elastic properties of 3D orthogonal C /C composite was established based on the micro-structure in this paper,and nine engineering constants of this material were evaluated with homogenization method,the prediction results agee well with experimental results. In order to further validate the proposed model,finite element analysis was carried to open hole tensile specimen with the engineering constants calculated,and strain around the hole coincides well with experimental results. In addition,the off-axis elastic properties were discussed,and the effect of properties of components on the elastic properties of this material was also investigated. The results indicate that the axial tensile modulus of the material is dominated by the fiber and shear modulus depends on that of matrix,however,the dominant constituent of in-plane shear modulus switches to fiber when the deflection angle increases to 45 degrees.
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Key words:
- calculations /
- carbon carbon composites /
- elastic moduli /
- errors /
- experiments
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