Shen Yiou, Jiang Bing, Li Yan
School of Aerospace Engineering and Applied Mechanics, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Institute of Engineering Mechanics, 29 Xuefu Road, Ha'erbin 150080, China.
Materials (Basel). 2019 Apr 23;12(8):1319. doi: 10.3390/ma12081319.
As a result of the increasing use of glass fiber reinforced plastic (GFRP) composites in engineering fields, the investigation of scale effect on impact performance for this kind of composite is essential for large scale structure design. The effects of scaling on the impact response of simply supported unidirectional GFRP were investigated through drop weight impact (DWI) tests in this study. Impact tests were undertaken over a wide range of energies to generate damages between barely visible and initiated penetration on four scale size GFRP laminates. The main impact responses including impact force, contact duration, displacement, energy absorption and damage area of scaled specimens were normalized to compare with the full-size specimen. It was found that the impact response of large sample with elastic deformation and small area of delamination can be predicted accurately according to a geometrical similar scaling law. Scale effect was found in the damage threshold force and absorbed energy of the laminates when significant internal damage occurs due to the microstructural effect becoming important in resisting impact force and absorbing impact energy. Moreover, the energy partition and effective stiffness were calculated according to the energy balance model to reveal the contribution of different modes of deformations on energy absorption for the GFRP laminates.
由于玻璃纤维增强塑料（GFRP）复合材料在工程领域的使用日益增加，对于这种复合材料的冲击性能进行尺度效应研究对于大型结构设计至关重要。本研究通过落锤冲击（DWI）试验，研究了尺度对简支单向GFRP冲击响应的影响。在广泛的能量范围内进行了冲击试验，以在四种尺度尺寸的GFRP层压板上产生从几乎不可见损伤到初始穿透的损伤。对包括冲击载荷、接触持续时间、位移、能量吸收和尺度试样损伤面积在内的主要冲击响应进行归一化处理，以便与全尺寸试样进行比较。研究发现，根据几何相似尺度定律，可以准确预测具有弹性变形和小分层面积的大尺寸试样的冲击响应。当由于微观结构效应在抵抗冲击力和吸收冲击能量方面变得重要而发生显著内部损伤时，在层压板的损伤阈值力和吸收能量中发现了尺度效应。此外，根据能量平衡模型计算了能量分配和有效刚度，以揭示不同变形模式对GFRP层压板能量吸收的贡献。
