三维五向编织复合材料低速冲击及冲击后压缩性能实验研究

通过实验研究三维五向碳纤维/环氧树脂编织复合材料低速冲击及其冲击后压缩(CAI)性能。测试试件虽然有不同的编织角度,但承受相同的冲击能力。采用冲击后压缩测试表征不同编织结构的冲击后剩余力学性能。结果表明:编织角较大的试件由于其更紧密的空间结构,能承受更高的冲击载荷且冲击损伤区域更小。CAI强度和损伤机理主要取决于编织纤维束的轴向支撑。随着编织角的增加,CAI强度降低,材料的破坏模式也由横向断裂转变为剪切破坏。

Experimental Investigation on Low-velocity Impact and Compression After Impact Properties of Three-dimensional Five-directional Braided Composites

The low-velocity impact and compression after impact (CAI) properties of three-dimensional (3D) five-directional carbon fiber/epoxy resin braided composites were experimentally investigated . Specimens prepared with different braiding angles were tested at the same impact energy level .Resid-ual post-impact mechanical properties of the different configurations w ere characterized by compres-sion after impact tests .Results show that the specimens with bigger braiding angle sustain higher peak loads ,and smaller impact damage area ,mainly attributes to a more compact space construction . The CAI strength and damage mechanism are found to be mainly dependent on the axial support of the braiding fiber tows .With the increase of braiding angle ,the CAI strength decreases ,and the damage mode of the composites is changed from transverse fracture to shear failure .