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以网状增强相纤维棒为研究对象,采用单胞几何模型分析法将该纤维棒的整体结构分为内部单胞、外部单胞等类型,并分别建立了内单胞、外单胞的力学模型。研究结果表明:基于等应变-应力混合平均思想并结合桥联模型,可计算出复合材料内外不同结构的有效工程弹性常数。该方法可有效分析不同结构组成的纤维复合材料内部纤维束的排列方式、外部增强相各参数[如编织角、纤维束截面和纤维体积分数等]之间的关系、纤维体积分数对纤维复合材料工程弹性常数的影响规律等,通过对比仿真结果验证了该方法在预测不同结构复合材料弹性性能方面是可行的。
Taking the reticulated fiber-reinforced phase rod as the research object, the whole structure of the fiber rod was divided into internal unit cell and external unit cell using the method of single-cell geometric model analysis, and the mechanics of internal unit cell and external unit cell were established respectively model. The results show that the effective engineering elastic constants of different structures inside and outside the composite can be calculated based on the equal strain-stress mixing theory and the bridge model. The method can effectively analyze the arrangement of fiber bundles inside the fiber composite material with different structures, the relationship between the parameters of the external reinforcing phase [such as the braiding angle, the fiber bundle cross section and the fiber volume fraction, etc.], the relationship between the fiber volume fraction and the fiber composite material The influence law of the elastic constants of engineering, etc. The simulation results show that this method is feasible in predicting the elastic properties of different structures.