摘要
利用NYL-200D型压力实验机和落锤装置对圆筒形碳纤维增强环氧树脂基复合材料结构进行了准静态和动态冲击压缩实验。在试件端部加粗的准静态压缩实验中,无填充物试件失效模式主要体现为纤维分层,表面产生褶皱,含填充物试件失效模式主要体现为试件环向膨胀导致外表面纤维分层,产生拉伸断裂。在试件端部未加粗的落锤压缩实验中,失效由试件相对薄弱一端开始,薄弱端纤维层逐渐发生分层失效,分别向筒壁内外发生卷曲,并伴随纤维丝断裂,最终在破坏端形成花瓣状。在所进行的静态、动态压缩实验中试件破坏模式主要体现为纤维分层,未发生剪切破坏和整体结构坍塌现象,因此增加环氧树脂基体与碳纤维增强相间的界面结合强度,可提高复合材料结构抗压能力。
Quasi-static and dynamic compression experiments of carbon fiber reinforced epoxy resin matrix composite cylinder structures are implemented by NYL-200D testing machine and drop weight equipment. In the quasi-static compression experiments, both ends of specimen are strengthened. The results show that the major failure modes of specimen without filler are fiber delamination and wrinkling on the surface of specimen. For the specimen with filler, the major failure modes are toroidal expansion delarrfination and fiber breakage. In the dynamic compression experiments, neither end of specimen is strengthened. The failure occurs on the relative weaker end. The fiber laminates are delaminated and crinkle inside and outside of the cylinder. The failure surface becomes petal-like and some fibers break finally. In quasi-static and dynamic compression experiments, the main failure mode is fiber delamination. Neither shear failure nor collapse is found in the experiments. So compression properties of carbon fiber reinforced composite material can be enhanced by improving interface-bonding strength between epoxy resin matrix and carbon fiber reinforcement phase.
出处
《工程力学》
EI
CSCD
北大核心
2009年第12期105-111,共7页
Engineering Mechanics
基金
总装武器装备探索研究项目(6130516)
关键词
复合材料
碳纤维
环氧树脂
压缩实验
落锤实验
composite material
carbon fiber
epoxy resin
compression experiment
drop weight experiment
