含孔复合材料层合板的压缩性能研究

Study on Compressive Properties of Composite Laminates with a Hole

对不同圆孔直径和不同孔形的含孔碳纤维增强环氧树脂基复合材料层合板进行了压缩实验,分析比较了破坏前后的形貌变化,研究了孔的直径和形状对复合材料层合板压缩强度的影响。结果表明,对于含圆孔的复合材料层合板,随着孔径的增大,压缩强度下降明显,二者之间并不满足线性关系。对于不同孔形的复合材料层合板,含圆孔的压缩强度最大,其次是椭圆孔,然后是方孔,最小的是菱形孔。在含孔复合材料结构设计过程中,应尽量使用圆孔。含孔复合材料层合板的破坏模式都为过孔破坏,破坏都发生在应力集中的区域,并且断裂都是沿着应力集中最大的方向扩展。侧面断口主要为剪切失效,有分层和屈曲的特征。

According to the compression test of carbon fiber reinforced epoxy resin matrix composite laminates with different hole diameters and shapes, the change of the microscope before and after damage was analyzed and compared, the influences of different hole diameters and shapes on compressive strength of the composite laminates were studied. The results show that with the increase of hole diameters, the compressive strength decrease gradually, but the relationship is not linear. For the different hole shapes of the composite laminates, the compressive strength of circular hole is biggest and followed by ellipse hole, square hole and rhombus hole. In the composite structure design, the circular hole should be used. The failure modes of composite laminates with hole are hole failure, the damage is occurred in the area of stress concentration, and the fracture is extend in the direction of the stress concentration of the largest. The side of fracture morphology is mainly shear failure, and the characteristic of buckling and delaminating.