Damage and wave propagation characteristics in thin GFRP panels subjected to impact by steel balls at relatively low-velocities
Damage and wave propagation characteristics in thin GFRP panels subjected to impact by steel balls at relatively low-velocities
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DOI：
10.1016/j.ijimpeng.2017.08.007
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发表时间：
2018
影响因子：
5.1
通讯作者：
A. Nassr;A. Nassr;Tomomi Yagi;T. Maruyama;G. Hayashi
中科院分区：
文献类型：
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作者：
A. Nassr;A. Nassr;Tomomi Yagi;T. Maruyama;G. Hayashi
进行了一项实验研究，以确定玻璃纤维增强聚合物（GFRP）板受到钢球以相对较低的速度（高达91 ms−1）撞击时的损伤和波传播特性。在保持冲击能量水平不变的情况下，研究了球体质量对板响应的影响。还研究了复合材料铺层顺序和连续冲击的影响。波的传播特性，包括波的类型，波的速度，波的衰减，和应变率，从动态应变记录在面板上的各个位置测量。结果表明，在相同的冲击能量下，小球质量比大球质量产生更大的变形和分层。此外，抗冲击性受到类似纤维重量分数的复合材料铺层顺序的影响。连续冲击试验板的累积分层面积增加，而试验表明，连续冲击对试验板的穿孔极限影响不大。冲击速度对测得的峰值应变和应变率有显著影响。弯曲波是主要的波系，以不同的速度向不同的方向传播。在冲击部位附近，弯曲波和压痕占主导地位的瞬态响应。除了弯曲波外，冲击还引起了低幅值的高速拉伸纵波。
An experimental investigation was conducted to determine the damage and wave propagation characteristics in Glass Fibre Reinforced Polymer (GFRP) panels subjected to impact by steel balls at relatively low-velocities up to 91 ms−1. While maintaining the same impact energy level, the influence of ball mass on panel response was studied. The effects of composite lay-up sequence and successive impacts were also investigated. The wave propagation characteristics, including wave types, wave velocities, wave attenuations, and strain rates, were extracted from dynamic strain records measured at various locations on the panels. The results showed that, for the same level of impact energy, the small ball mass produced larger deformation and delamination than the large ball mass. Additionally, the resistance to impact was influenced by the composite lay-up sequence of similar fibre weight fraction. Test panels subjected to successive impacts showed an increase in cumulative delamination areas, whereas the tests indicated that successive impacts had a little effect on the perforation limit of the test panels. The impact velocity showed a pronounced influence on the measured peak strains and strain rates. The flexural wave was the predominant wave system, propagating at different velocities in different directions. In proximity to the impact site, both flexural wave and indentation predominated over the transient response. In addition to the flexural wave, impact induced low amplitude tensile longitudinal waves of high velocity.