玻璃纤维-碳纤维混杂增强PCBT复合材料层合板的制备及低速冲击性能

采用环状对苯二甲酸丁二醇酯(CBT)预浸料,利用真空袋辅助热压工艺制备了玻璃纤维机织布-碳纤维机织布/聚环状对苯二甲酸丁二醇酯(GF-CF/PCBT)混杂复合材料层合板。利用双悬臂梁(DCB)和三点端部开口弯曲(3ENF)试验对连续纤维增强PCBT复合材料层合板的层间强度做出评估。同时,利用低速冲击试验结合Abaqus/Explicit有限元仿真重点考察了混杂纤维增强PCBT复合材料层合板的低速冲击性能。试验结果表明:尽管CF/PCBT复合材料层合板具有优异的层间性能,当冲击能量为114.3J时,由于CF自身的脆性,CF/PCBT复合材料层合板被完全穿透,而GF-CF/PCBT混杂复合材料层合板只在表面形成凹痕。与纯CF增强PCBT复合材料层合板相比,铺层形式为[CF/GF/CF]25的GF-CF/PCBT混杂复合材料层合板的抗冲击损伤能力提高2倍。仿真得到的云图显示,冲击引起的应力在CF中的分布区域要明显大于在GF中的分布区域。

Preparation and low-velocity impact properties of glass fiber-carbon fiber hybrid reinforced PCBT composite laminate

The glass fiber woven fabric-carbon fiber woven fabric/poly(cyclic butylene terephthalate) (GF-CF/PCBT) interlaminated hybrid composite laminates were prepared by vacuum bag assisted hot-press processing from the cyclic butylene terephthalate (CBT) prepregs. Double cantilever beam (DCB) and three-point end notched flexure (3ENF) tests were adopted to estimate the interlaminar performance of the obtained continuous fiber reinforced PCBT composite laminates. Meanwhile, the response of hybrid fiber reinforced PCBT laminates under low-velocity impact was mainly investigated by the tests and Abaqus/Explicit finite element simulation, respectively. The test results show that, despite the excellent interlaminate performance of CF/PCBT composite laminates, CF/PCBT composite laminates are penetrated under the impact energy of 114.3 J due to the brittleness of CF. As a comparison, the GF-CF/PCBT interlaminated hybrid laminates form merely dent on surface. Compared with pure CF reinforced PCBT composite laminates, the impact strength of GF-CF/PCBT interlaminated hybrid laminates with the layer form [CF/GF/CF]₂₅ enhances significantly by 2 times. Simulation results show that stress area in CF is larger than that in GF in the resulted stress nephogram.