Evaluation of Crashworthiness Parameters of Metallic Tubes with Multiple Inner Step Tubes Arrangements

A. Mustafa, H. Saeed
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Abstract

Response during energy absorption of a tube system is the key for its application in structures under dynamic loading. An ideal energy absorber should behave with a low peak force, high mean crushing force and with a smooth force displacement curve while under dynamic loading. In this particular study, a bunch of metallic 3-step stepped-tubes with ascending number of stepped-tubes in different configurations are placed inside a metallic thin-walled tube and are numerically investigated for its energy absorption characteristics under dynamic axial loads. Stepped-tubes can absorb energy with progressive failure as per specific need of the design but their geometry parameters influence their performance. One of the initial proposed configurations with five stepped-tubes arrangement is further investigated for changing geometry of stepped-tube and sensitivity of energy absorption characteristics with changed geometry are studied. Deformation modes and different energy absorption parameters such as peak value of crushing force, specific energy absorption, mean crushing force and crush force efficiency are plotted for all of the configurations. Results are compared with published numerical and experimental results for the impact of the proposed configurations on energy absorption capability.
多层内阶梯管结构金属管的耐撞性参数评定
管系吸能响应是管系在动载结构中应用的关键。理想的吸能器在动载荷作用下应具有低峰值力、高平均破碎力和平滑的力位移曲线。本文在金属薄壁管内放置一串不同构型的3阶阶梯管,阶梯管数量递增,并对其在轴向动载荷作用下的吸能特性进行了数值研究。根据设计需要,阶梯管可以吸收递进破坏的能量,但其几何参数会影响其性能。进一步研究了最初提出的五阶管结构对阶管几何形状的影响,并研究了阶管几何形状变化对能量吸收特性的敏感性。绘制了所有构型的变形模式和不同的能量吸收参数,如破碎力峰值、比能量吸收、平均破碎力和破碎力效率。结果与已发表的数值和实验结果比较了所提出的结构对能量吸收能力的影响。
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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