孔隙微观特征对碳纤维/环氧树脂复合材料横向拉伸强度的影响

通过有限元方法研究了相同孔隙率下孔隙的分布、尺寸和形状等微观特征对碳纤维增强环氧树脂复合材料单向板横向拉伸强度的影响。首先使用Matlab对复合材料微观图像进行处理，提取孔隙的半径分布。然后通过C++编写多种孔隙随机分布算法，包括可以生成不同分布孔隙、不同尺寸孔隙以及不同形状孔隙的随机分布算法。最后通过Python参数化生成代表性体积单元（RVE），用有限元方法研究相同孔隙率下孔隙的分布、尺寸和形状对碳纤维/环氧树脂复合材料单向板横向拉伸强度的影响。研究结果显示，孔隙率相同时，碳纤维/环氧树脂复合材料的孔隙形状对横向弹性模量的影响较大，孔隙尺寸和形状对横向拉伸强度有较大的影响。

Influence of void micro-characteristics on transverse tensile strength of unidirectional carbon fiber/epoxy resin composites

The effect of void distribution, size and shape on transverse tensile strength of unidirectional carbon fiber-reinforced epoxy resin composites with same void content was studied. SEM images of composites were processed using Matlab and the void radius distribution of composites was obtained. The void random algorithms were programmed by C++, including void random distribution algorithm, different void radius algorithm and different void shape algorithm. The representative volume element(RVE) of the composites microstructure was generated by Python. The effect of void distribution, size and shape on transverse tensile strength of unidirectional carbon fiber/epoxy resin composites was simulated by the finite element analysis. It is found that carbon fiber/epoxy resin with the same void content, the effect of void shape on transverse modulus is relatively large, and the void size and void shape affect the transverse tension strength largely.