CAJ | 학술논문

由于复合材料的各向异性、树脂导热性差和层间韧性低,在二次机械加工特别是钻削制孔过程中,复合材料易产生毛刺、分层等缺陷和损伤,将短纤维层间增韧方法用于钻削损伤的抑制研究.制备低密度芳纶短纤维薄膜,采用低压接触成型工艺制备了含短纤维增韧与未增韧的复合材料层合板,进而在加工试验台上进行钻削试验.通过对试件加工孔的红外无损检测和显微观测,研究转速和短纤维增韧对复合材料制孔损伤的影响,结果表明提高转速和短纤维界面增韧可改善制孔质量.基于短纤维与基体间相互作用,揭示其增韧机理是由于短纤维在层间形成的丰富桥联抑制了分层扩展,同时短纤维与层间树脂复杂的破坏机制而产生额外的能量耗散,并讨论短纤维参数对增韧效果的影响.该方法为复合材料高质量加工提供借鉴意义.
유우복합재료적각향이성、수지도열성차화층간인성저,재이차궤계가공특별시찬삭제공과정중,복합재료역산생모자、분층등결함화손상,장단섬유층간증인방법용우찬삭손상적억제연구.제비저밀도방륜단섬유박막,채용저압접촉성형공예제비료함단섬유증인여미증인적복합재료층합판,진이재가공시험태상진행찬삭시험.통과대시건가공공적홍외무손검측화현미관측,연구전속화단섬유증인대복합재료제공손상적영향,결과표명제고전속화단섬유계면증인가개선제공질량.기우단섬유여기체간상호작용,게시기증인궤리시유우단섬유재층간형성적봉부교련억제료분층확전,동시단섬유여층간수지복잡적파배궤제이산생액외적능량모산,병토론단섬유삼수대증인효과적영향.해방법위복합재료고질량가공제공차감의의.
The mechanical property of composites presents anisotropy, the low thermal conductivity of resin, and low interlaminar toughness. So the process of secondary machining composites could lead to defects like burrs and delamination, especially in drilling. The chopped fibers reinforcement technology is employed to prevent the delamination of composites in drilling process. Aramid fibers are selected to manufacture low-density thin film. The composite laminates with and without chopped fibers reinforcement are manufactured by low pressure contact forming process. And the experiments are also performed to investigate the machining surface quality. The preventing effects of increasing spindle speed and chopped fibers on the defects of composites in drilling are validated by infrared nondestructive testing and microscope observation. The reinforced mechanism is the extra energy dissipation caused by the complex failure process between chopped fibers and matrix. The influence of chopped fiber parameters on the energy dissipation is also discussed. The study on interfacial reinforcement of composite laminates is a worth project for high quality drilling.