撞击物对复合材料层合板冲击损伤特性的影响

Influences of Impactor Parameters on the Impact Damage Response of Composite Laminate

针对一种采用预浸料成型工艺制备的复合材料层合板,开展不同撞击物作用下复合材料层合板低能量冲击损伤特性研究.通过对比相同冲击能量(60 J)下,钢球、铝球和聚合物球撞击复合材料层合板的落锤/气炮冲击试验结果和冲击后含损伤结构的压缩试验结果,研究了不同撞击因素对复合材料低能量冲击损伤面积和剩余压缩强度的影响.结果表明,相同冲击能量下,同种材质撞击物(不同质量)以不同速度冲击复合材料层合板的损伤特性相似;而不同材质撞击物(不同弹性模量和泊松比)得到的结果差异显著.结合赫兹接触理论,初步解释了撞击物弹性性能影响接触刚度和冲击损伤程度的规律.

The low-energy impact damage responses of a composite laminate prepared by prepreg forming process were studied under the impacts with various impactors.Firstly,the impactors made of steel,aluminum and polymer were applied to impact the laminates at the same energy(60 J)by using drop weight/air gun facilities.Then,the damaged structures after impact were compressed to obtain the residual strength/residual stiffness of composites under low-energy impact.From these experimental results,one can see that with the same impact energy,the damage responses of composite laminate impacted by the same material(with different mass and velocity)are almost the same,however,the results of impactors with different materials are significantly different.The Hertzian contact theory is employed to illustrate the influence of elastic parameters of impactors on the contact stiffness as well as the damage responses of composite laminate.