摘要
为说明单向复合材料在高速冲击下的破坏行为,给抗冲击材料的结构设计提供指导。通过有限元模拟分析方法,在纱线与树脂基体尺度上计算单向复合材料在不同冲击速度下的响应与破坏。对比分析不同冲击速度下材料上某特殊位置点的挠度变化曲线、应力变化曲线以及材料破坏形态,探讨单向复合材料的抗冲击行为。在高速冲击作用下,由于冲击能量被靶体吸收与耗散,单向复合材料的应力及变形幅度随着时间的延长越来越小;此外,树脂碎裂、纱线的断裂抽拔是单向复合材料在高速冲击下的主要破坏模式。且由于受力模式的不同,材料下表面的破坏程度比上表面更为剧烈。
In order to summarize the damage behavior of the unidirectional composite subjected to high-velocity impact and give a guide to the structural design of impact-resistant materials,the response and damage of unidirectional composite in various levels of yarn and resin at different impact velocities were calculated by finite element modeling and analysis.The impact resistant properties of unidirectional composite are illustrated by analyzing the deflection-time curves,stress-time curves and damaged morphologies under different impact velocities.During the process of high-velocity impact,the amplitudes of stress and deflection decreased all the time due to the impact energy absorbed and dissipated by the unidirectional composite.In addition,the fracture of resin and breakage of fiber tows were the main damage modes of unidirectional composite under impact loading.The damage at the bottom surface of the composite was more serious than that on the top surface owing to different modes of force acting upon them.
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2012年第10期47-50,共4页
Journal of Textile Research
关键词
单向复合材料
冲击
破坏
有限元
unidirectional composite
impact
damage
finite element
