While cylindrical shells having corrugated or honeycomb sandwich walls exhibit attractive properties such as high stiffness/strength at low density and enhanced energy absorption, existing studies focused primarily on axial loading conditions. In reality, however, such sandwich cylindrical shells frequently face the threat of lateral impacts like in the case of high-speed railways and tube/pipeline systems. To explore the dynamic response of a fully-clamped sandwich cylindrical shell under lateral shock loading, a combined experimental and numerical study is carried out. Specimens of aluminum (Al) corrugated core sandwich cylindrical shells as well as thin-walled Al cylindrical shells are fabricated using the method of extrusion. Impact tests on these specimens are conducted using closed-cell Al foam projectiles launched via a light-gas gun. For each specimen, dynamic structural evolution, final deformation mode, and quantitative deflection are comprehensively measured and analyzed. Subsequently, a finite element (FE) model is established to simulate the lateral impact test, with good agreement against experimental measurements achieved. The validated FE model is then employed to quantify the effect of the number of corrugations in the core and explore energy absorption characteristics of individual components in the sandwich shell. In comparison with a thin-walled cylindrical shell of equal mass, the corrugated core sandwich cylindrical shell exhibits elevated lateral shock resistance (particularly so in the case of outer surface mid-point deflection on the impact side and inner diameter crushing), due mainly to energy absorption via core compression. However, within the studied range of impact momentum, the sandwich shell experiences consistently more significant bulging on the rear side than its thin-walled counterpart. A circumferential stress distribution map is constructed to reveal that the introduction of a corrugated core interrupts the continuous transmission path of circumferential stress along the shell’s circumferential direction. As a result, the contribution of circumferential membrane force to rear-side deformation is reduced while the influence of bending moment becomes dominant, leading to more significant bulging deformation on the rear side of the sandwich shell.

中文翻译：

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局部侧向冲击载荷下夹持全金属波纹芯夹层圆柱壳的动力学响应

虽然具有波纹或蜂窝夹层壁的圆柱形壳体表现出有吸引力的特性，例如在低密度下具有高刚度/强度和增强的能量吸收，但现有研究主要集中在轴向载荷条件下。然而，在现实中，这种夹层圆柱形壳经常面临横向冲击的威胁，例如高速铁路和管道/管道系统。为了探究全夹持夹层圆柱壳在横向冲击载荷下的动力学响应，进行了试验和数值相结合的研究。铝 （Al） 波纹芯夹层圆柱壳以及薄壁 Al 圆柱壳的试样采用挤压方法制造。这些试样的冲击试验是使用通过轻型气枪发射的闭孔泡沫铝弹丸进行的。对于每个试件，对动态结构演变、最终变形模式和定量挠度进行了综合测量和分析。随后，建立了有限元 （FE） 模型来模拟横向冲击试验，与实验测量结果吻合较好。然后，采用经过验证的有限元模型来量化芯中波纹数量的影响，并探索夹层壳中各个组件的能量吸收特性。与同等质量的薄壁圆柱形壳体相比，波纹芯夹层圆柱壳体表现出更高的抗横向冲击性（尤其是在冲击侧外表面中点偏转和内径压碎的情况下），这主要是由于通过芯部压缩吸收能量。 然而，在研究的冲击动量范围内，夹层壳的背面始终比薄壁壳更明显的凸起。构建了圆周应力分布图，以揭示波纹芯的引入中断了圆周应力沿壳圆周方向的连续传递路径。因此，圆周膜力对背面变形的贡献减小，而弯矩的影响变得占主导地位，导致夹层壳背面出现更显着的凸起变形。