试验制备了三维编织四向结构、五向结构和六向结构的玻璃纤维预制件增强环氧树脂梁的复合材料试样,每种试样包含20°、30°和40°三个编织角度.研究了编织结构和编织角参数对复合材料低速冲击及冲击后压缩性能的影响,分析了损伤后的试样形貌及破坏情况.试验结果表明:编织参数对复合材料的损伤容限影响较显著;编织角相同时,五向结构具有较高的CAI强度,而六向结构则表现出较好的冲击韧性;编织结构相同时,30°编织角试样的抗冲击性能较好;同时,冲击后压缩试样表现出脆性断裂特征.
This research dealt with the impact and Compression-After-Impact properties of epoxy matrix composite beams manufactured from three-dimensional braided glass fabrics.Three different architectures of the braid structures,4-Direction,5-Direction and 6-Direction,were investigated together with three further various braiding angles of each architecture.The effect of architecture and braiding angle parameters upon the impact and CAI properties was examined.Damage morphology and failure mechanisms of the impacted materials were characterized.It has been found that the parameters affected the damage resistance and tolerance of composites evidently.6-Directional composites showed high impact toughness,whereas 5-Directional ones had higher CAI strength compared with others which had same braiding angle.Failure of the specimens with small damage area revealed the brittle characteristic of 3D braided composite.
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