冲击荷载下植物纤维增强高聚物复合材料的力学性能

Mechanical Properties of Natural Fiber Reinforced Polymer Composites under Impact Loading

植物纤维代替人造纤维作为填充体的增强高聚物复合材料可用于汽车、航空航天等工业。选用一定含量的植物纤维及其他填充材料增强高聚物复合材料,在万能材料试验机和分离式霍普金森杆实验装置上进行不同应变率下准静态和动态冲击拉伸及压缩实验。结果显示,在植物纤维中加入少量的纳米黏土颗粒和长玻璃纤维能够较大地提高复合材料的力学性能。使用扫描电子显微镜对不同应变率拉伸下的回收试件断口进行微观分析,揭示了植物纤维增强高聚物复合材料在不同应变率下的断裂特性。

Natural fiber, replacing conventional reinforced as its various advantages, often are embedded in weaker material for reinforcing the materials. Natural fiber reinforced polymer composites are widely used in application of automotive construction, aerospace, etc. as special engineering material because of outstanding mechanical properties. In this paper, the uniaxial tension and compression tests of polymer composites filled with constant content natural fiber and other filler were examined on universal testing machine and split Hopkinson bar at different strain rates. The test results show that the mechanical properties of natural fiber reinforced polymer composite are significantly improved by additional modified nano clay and long glass fiber. The fracture surface of recovered specimen of different strain rates were observed by using scanning electron microscope (SEM), and the tensile failure characteristics was revealed.