叠层顺序对回收碳纤维/苎麻混杂增强PE-HD复合材料力学性能影响

Effects of Stacking Sequence on Mechanical Properties of Recycled Carbon Fiber/Ramie Hybrid Reinforced PE-HD Composites

利用回收碳纤维(rCF)和苎麻纤维(RF)为增强材料,高密度聚乙烯(PE-HD)为树脂基体,采用模压法分别制备PE-HD/rCF和PE-HD/RF片状模塑料,然后取4片PE-HD/rCF和4片PE-HD/RF片状模塑料热压成不同叠层顺序的混杂复合材料,研究rCF和RF的叠层顺序对复合材料的冲击强度、拉伸强度的影响,利用高清电子测量显微镜观察材料的破坏模式和微观形貌。研究结果表明,叠层顺序对复合材料的冲击强度和拉伸强度有较大的影响,在冲击过程中,叠层混杂复合材料的冲击破坏模式主要是能量传递给纤维导致其断裂,将rCF置于样品冲击面时的冲击强度更高,芯部由rCF和RF叠层混杂组成可以进一步提高材料的冲击强度。叠层混杂复合材料的拉伸破坏模式主要是rCF断裂、层间剥离,通过rCF和RF的夹层结构设计可获得正混杂效应,提高了复合材料的拉伸强度。

Recycled carbon fiber(rCF)and ramie fiber(RF)were used as reinforcing materials,and high density polyethyl-ene(PE-HD)was used as the resin matrix,the PE-HD/rCF and PE-HD/RF sheet molding compounds were prepared by molding method respectively,and 4 pieces of PE-HD/rCF and 4 pieces of PE-HD/RF sheet molding compounds were hot pressed into a laminated hybrid composites.The tensile strength and impact strength of different composites were tested.High definition electron measurement microscope was used to observe the failure mode and morphology of the composites.The results show that the stacking sequence has influence on the impact and tensile strength of composite.In the process of impact,the impact failure mode of lami-nated hybrid composite is mainly energy transfer to the fiber leading to its fracture,when rCF is placed on the impact surface of the sample,the impact strength is higher,the core is composed of rCF and RF layers,which can further improve the impact strength of composite.The tensile failure mode of laminated hybrid composite is mainly rCF fracture and delamination.Through the sandwich structure design of rCF and RF,the positive hybrid effect can be obtained and the tensile strength of composite can be improved.