一种新型冲击吸能薄壁管的设计和控制原理

以局部表面纳米化区域的形状、尺寸和孪晶间距作为设计变量，以薄壁管的比吸能作为目标函数，以最大冲击载荷限制、边界条件和加载方式等因素作为约束条件，对薄壁管屈曲模式和吸能效果进行优化设计.结果表明，经优化的局部表面纳米化，不仅可诱导和控制薄壁管稳定渐进紧凑的屈曲模态，而且使薄壁管大大提高吸能效果以及保持原结构的外形.从而提出一种新型吸能薄壁管的设计原理和技术，实现薄壁管吸能效果的最大化和吸能结构的设计思路.

A Principle of Design and Control for a New Type Thin-Wall Tube of Energy Absorption Under Impact Loads

Buckling modes and the energy absorption effect of thin wall-tubes were optimized. In optimizing, the shape and size of the local surface self-nanocrystallization and the twin spacing were taken as the design variables. The ratio of energy absorption of thin-wall tubes was considered as the objective function, and the limit of maximum impact load, boundary conditions and loading conditions as the constraint conditions. The results show that the method of optimized local surface self-nanocrystallization not only can induce and control steady progressive buckling modes of thin-walled tubes, but also can greatly improve the energy-absorbing properties and keep the shapes of the original structures. In this way, a new design principle and technology of thin-wall tubes of energy absorbing was presented. The maximal effect of energy absorption of thin-wall tubes was achieved and the design idea was proposed for structures of energy absorption.