Chen Jinxiang, Du Shengchen, He Chaochao, Zhu Nanxing
Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 211189, China.
Materials (Basel). 2022 Nov 3;15(21):7748. doi: 10.3390/ma15217748.
The vibrational properties and mechanism of a foam-filling short basalt fiber reinforced epoxy resin composite beetle elytron plate (EBEP) were studied by experiments and the finite element (FE) method in this paper. The experimental results showed that the natural frequencies of the first two modes of the EBEP were very close to those of a foam-filling short basalt fiber reinforced epoxy resin composite honeycomb plate (HP), while the vibrational response of the EBEP was weaker than that of the HP, and the damping ratio was improved; the improvement of the second mode was significant. Therefore, the EBEP had a better vibration reduction performance and could directly replace the HP in engineering applications. The FE results showed that foam filling enhanced the shear stiffness of the whole core structure, and had a more obvious effect on the shear stiffness of the HP. Meanwhile, it particularly reduced the shear force proportions and contributed to the protection of the skin and core skeleton. The mechanisms of the vibrational characteristics of these two types of sandwich plates were explored from the perspective of the equivalent cross-sectional area, shear stiffness, shear strain energy per unit volume and friction. These results provide a valuable reference for the promotion and application of EBEP in the fields of vibration reduction and seismic resistance.
本文通过实验和有限元方法研究了泡沫填充短玄武岩纤维增强环氧树脂复合甲虫鞘翅板（EBEP）的振动特性及机理。实验结果表明，EBEP前两阶模态的固有频率与泡沫填充短玄武岩纤维增强环氧树脂复合蜂窝板（HP）非常接近，而EBEP的振动响应比HP弱，阻尼比有所提高，其中二阶模态的改善较为显著。因此，EBEP具有较好的减振性能，在工程应用中可直接替代HP。有限元结果表明，泡沫填充提高了整个芯层结构的剪切刚度，对HP的剪切刚度影响更为明显。同时，它尤其降低了剪切力比例，有助于保护蒙皮和芯层骨架。从等效截面积、剪切刚度、单位体积剪切应变能和摩擦力的角度探讨了这两种夹芯板振动特性的机理。这些结果为EBEP在减振和抗震领域的推广应用提供了有价值的参考。
