本文设计了五种具有直交和弯交结构的角联锁织物,并与环氧树脂复合固化制成复合材料薄板,采用落球冲击实验结合振动测试系统,通过采集落球冲击前后的动能差以及复合材料各测试点处加速度的动态信号频谱,研究了角联锁结构复合材料冲击作用下的吸能特性和振动性能.结果表明,因织物结构不同造成的纤维体积含量、经纱弯曲角度和经纱跨度等因素能够对角联锁复合材料的冲击动态力学性能产生显著影响.几种板材的固有频率随纤维体积含量的增大而增大,直交结构比弯交结构振动衰减慢得多,且弯交结构的振动阻尼明显高于直交结构.
In this paper,five orthogonal and bend cross-structure of angle interlock fabrics were designed and made of composites with epoxy resin,using drop-ball impact test with vibration test systems,by collecting the kinetic energy difference before and after the ball impacted.as well as the dynamic signal spectrum of acceleration of test point to study the energy absorption characteristics and vibration performance of angle interlock composites under impact loading.The results showed that the difference of fabric structure caused by different fiber volume fraction,bending angle and span of the warp yarn and other factors could affect the dynamic mechanical properties of composite materials significantly.The natural frequency of several plates increased with fiber volume fraction's increasing,vibration attenuation of orthogonal structure is much slower than the cross,and vibration damping of the bend crossstructure Was higher than that of the orthogonal structure obviously.
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