Abstract

In this study, the dynamic stability and energy absorption of a novel type of sandwich panels with an extensive application in light vehicles are investigated. The curved panels are laminated multi-scale hybrid nanocomposites reinforced with carbon nanotubes. The whole panel is on a non-polynomial viscoelastic substrate to control the stability of the panel following vibrations. The 3D elasticity model is utilized for analyzing dynamic behavior and energy absorption. Moreover, a non-polynomial viscoelastic model is employed to take the effect of the viscoelastic substrate into account. The equivalent bulk properties of the nanocomposite are obtained using micromechanics and Halpin–Tsai relations. The nano-reinforcements are considered to have even distribution and random orientations in the epoxy matrix. The effects of material and loading conditions including viscoelastic parameters, compressibility, fiber’s volume and weight fractions, damping factor, and initial axially stress on the dynamic stability of the curved panels are evaluated. The most important outcome of this paper is that the change in ${\sigma }_r^{-o}$ parameters has a significant effect on dependency of energy absorption on radial stress. In application, the results suggest decreasing compressibility leads to increasing energy absorption of the shell structure.

摘要

在这项研究中，研究了一种广泛应用于轻型车辆的新型夹芯板的动态稳定性和能量吸收。弯曲面板是用碳纳米管增强的层压多尺度混合纳米复合材料。整个面板位于非多项式粘弹性基板上，以控制面板在振动后的稳定性。3D 弹性模型用于分析动态行为和能量吸收。此外，采用非多项式粘弹性模型来考虑粘弹性基材的影响。使用微观力学和 Halpin-Tsai 关系获得纳米复合材料的等效体积特性。纳米增强材料被认为在环氧树脂基体中具有均匀分布和随机取向。评估了材料和载荷条件（包括粘弹性参数、压缩性、纤维的体积和重量分数、阻尼系数和初始轴向应力）对弯曲面板动态稳定性的影响。本文最重要的成果是改变了${\sigma }_r^{-哦}$参数对能量吸收对径向应力的依赖性有显着影响。在应用中，结果表明降低压缩率会导致壳结构能量吸收增加。