An Arrow-Shaped Honeycomb Pedestal With Negative Poisson Ratio and its Impact Resistance

Haoran Wu, Xiao-Xuan Lin, Jie Zhang
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Abstract

The ship’s pedestal is the connection structure between the ship’s equipment and the hull, and is also the basis for the installation of the equipment. The pedestal bears both the static load generated by the weight of the equipment and the dynamic load generated during the operation of the equipment, and at the same time transmits the external load received by the hull to the equipment, and the load it bears is very complicated. If there is a problem with the pedestal in an impact environment, the accuracy of the system equipment will be affected, the system equipment will not work properly. Negative Poisson’s ration structures have a unique set of properties because of their tensile expansion, such as increased shear modulus, enhanced fracture toughness, better energy absorption and co-curvature. In recent years, the negative Poisson’s ration honeycomb structure has been applied to the pedestal of marine equipment, which demonstrates good vibration damping effect. However, the pedestal has two functions: vibration damping and impact resistance, there is not much research on the impact resistance of the pedestal. In this paper, an “arrow-shaped” honeycomb pedestal is taken as the research object. Firstly, the analytical expression of the Poisson’s ration of the honeycomb pedestal is derived theoretically and the influence of each parameter on the Poisson’s ration is analyzed. Secondly, the effect of Poisson’s ration on the impact resistance of the pedestal was analyzed by ensuring that the pedestal height was constant. It was found that with the reduction of Poisson’s ration, the impact resistance of the pedestal and the output impact environment of the pedestal panel were effectively optimized. Finally, by ensuring that the height of the pedestal is constant and the Poisson’s ration is the same, the influence of the number of honeycomb layers on the impact resistance of the pedestal is analyzed.
负泊松比箭头型蜂窝基座及其抗冲击性能
船舶基座是船舶设备与船体之间的连接结构,也是设备安装的基础。底座既要承受设备自重产生的静载荷,又要承受设备运行过程中产生的动载荷,同时还要将船体接收的外部载荷传递给设备,其承受的载荷十分复杂。如果在冲击环境下底座出现问题,将会影响系统设备的精度,系统设备将不能正常工作。负泊松比结构由于其拉伸膨胀而具有一系列独特的性能,如增加剪切模量,增强断裂韧性,更好的能量吸收和共曲率。近年来,负泊松比蜂窝结构已应用于船用设备的基座上,表现出良好的减振效果。然而,支座具有减震和抗冲击两大功能,对支座抗冲击性能的研究并不多。本文以一种“箭头形”蜂窝基座为研究对象。首先,从理论上推导了蜂窝基座泊松比的解析表达式,并分析了各参数对泊松比的影响。其次,在保证支座高度一定的情况下,分析了泊松比对支座抗冲击性能的影响。研究发现,随着泊松比的减小,支座的抗冲击性能和支座面板的输出冲击环境得到了有效的优化。最后,在保证基座高度一定、泊松比相同的情况下,分析了蜂窝层数对基座抗冲击性能的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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