作　　者： ; ; ;

机构地区： 西北工业大学力学与土木建筑学院

出　　处： 《机械科学与技术》 2013年第12期1807-1811,共5页

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。 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 hom- ogenization method, the prediction results agee well with experimental results. In order to further validate the pro- posed model, finite element analysis was carried to open hole tensile specimen with the engineering constants calcu- lated, and strain around the hole coincides well with experimental results. In addition, the off-axis elastic proper- ties were discussed, and the effect of properties of components on the elastic properties of this material was also in- vestigated. 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.

关 键 词： 复合材料 三向正交 单胞模型 均匀化方法 弹性性能

领　　域： [一般工业技术]