This paper presents the quasi-static free inversion behavior of a new conical tube absorber. The absorber is composed of a multi-component conical tube with a spherical end cap and varying lengths and diameters. When this structure undergoes an axial load, each tube component freely inverts inside the next component like a telescope. Finite element (FE) models were made using ABAQUS explicit code to simulate the deformation and energy absorption of multi-component conical tubes. To verify the accuracy of the FE models, they were validated with experimental tests. As a general framework for a design optimization study, structural parameters such as wall thickness, cap radius, and edge length of the absorber affect the initial peak load and specific energy absorption. To achieve the optimal design for the multi-component conical tube, mathematical models were developed using the response surface method, and the multi-objective optimization procedure was applied to find the optimal values for the design variables. The results of the multi-objective optimization demonstrated improvements in both objective functions compared to existing designs. Specifically, by increasing the cap radius and decreasing the edge length, the initial peak load was reduced, while increasing the wall thickness the specific energy absorption was enhanced.

本文介绍了新型锥形管吸波器的准静态自由反转行为。吸收器由多部件锥形管组成，具有球形端盖和不同的长度和直径。当这种结构承受轴向载荷时，每个管部件都会像望远镜一样在下一个部件内自由翻转。使用ABAQUS显式代码建立有限元（FE）模型来模拟多部件锥形管的变形和能量吸收。为了验证有限元模型的准确性，通过实验测试对其进行了验证。作为设计优化研究的一般框架，吸收器的壁厚、帽半径和边缘长度等结构参数会影响初始峰值载荷和比能量吸收。为了实现多部件锥形管的优化设计，使用响应面法建立了数学模型，并应用多目标优化程序来找到设计变量的最佳值。多目标优化的结果表明，与现有设计相比，两个目标函数都有所改进。具体来说，通过增加盖半径和减少边缘长度，可以降低初始峰值载荷，同时增加壁厚，可以增强比能量吸收。