摘要
对[0/90/0/90]_(2s)和[+45/-45/0/90]_(2s)以及平纹布铺层方式的T300/环氧复合材料层合板进行低速冲击实验,在圆形试样的基础上比较不同铺层结构的复合材料在冲击性能方面的差异,从冲击能量传播的角度分析不同铺层结构复合材料的冲击破坏机理。并在ABAQUS有限元模拟的基础上分析冲击破坏的能量传播机理。结果表明冲击能量的传播与复合材料层合板中织物沿厚度方向的铺层结构有关,也与每一层织物内纤维的方向和纤维的空间结构有关。冲击能量在排列很直的纤维中传播很快,沿纤维轴向的损伤更容易传递,所以单向布铺层的复合材料与平纹布铺层的复合材料相比,冲击中心区域的损伤小,但是损伤的范围大,纤维的弯曲会降低冲击能量沿纤维轴向的传播速度,平纹织物中每一层纤维存在交织点,冲击能量集中在冲击中心区域,使得平纹布铺层的复合材料冲击损伤集中于冲击中心处且损伤程度比单向布铺层的复合材料大,出现更多的纤维断裂情况。在铺层复合材料中纤维排列的方向越多,沿纤维轴向传播的能量方向也就越多,冲击能量在每一层的面内传播更均匀,有利于减轻复合材料受冲击的损伤程度。
In this paper,the low-velocity impact response of unidirectional and woven carbon / epoxy laminates was compared by analyzing the mechanism of impact damage. All samples are circular specimen,the stacking sequence of unidirectional laminate are [0 / 90 / 0 / 90]2sand [＋45 /-45 / 0 / 90]2s. The results show that the spread of impact energy is associated with the stacking sequence of composite laminate,the direction and space structure of fiber in each layer can also influence the spread of impact energy. Impact energy spread quickly in straight fiber.Compared with the woven laminate,the unidirectional laminate has lower degree of damage in the center of impact area,but it has a wider range of damage. Fiber bending will lower the speed of impact energy along the fiber axial.In the woven laminate,weaving point makes the impact energy concentrated in the central area of impact,resulting in more fiber fracture. On the other hand,the more arrangement direction of fiber in each layer,the more evenly impact energy within each layer spread. And it is helpful to reduce the impact damage of the composite material.
出处
《玻璃钢／复合材料》
CAS
CSCD
北大核心
2016年第3期31-37,共7页
Fiber Reinforced Plastics/Composites
基金
上海市科委<上海市科技成果转化和产业化项目>资助项目(12521102400)
关键词
复合材料
冲击破坏
有限元
能量传播
composite materials
low-impact damage
finite element
energy spread
