High-velocity impact response of cylindrical tubes with linear gradient grooves: A comparative study

被引:6
作者
Abadi, Mostafa Mastan [1 ]
Alijani, Ali [1 ]
Rad, Sina Gohari [2 ]
Salehpour, Mohammad [1 ]
机构
[1] Islamic Azad Univ, Dept Mech Engn, Bandar Anzali Branch, Bandar Anzali, Iran
[2] Islamic Azad Univ, Dept Mech Engn, Rasht Branch, Rasht, Iran
关键词
Gradient grooved tube; Energy absorption; High-rate loading; Thin-walled tube; THIN-WALLED TUBES; ENERGY-ABSORPTION; CIRCULAR TUBE; METAL TUBES; SHELLS; CRASHWORTHINESS; COLLAPSE; FOAM; TRANSITION; BEHAVIOR;
D O I
10.1016/j.tws.2022.109741
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Grooved tubes benefit from optimized energy absorption characteristics compared to regular tubes. This paper investigated the crashworthiness characteristics of cylindrical tubes with various types of grooves under high-speed impact loads. Furthermore, the dynamic load response of tubes with external grooves having linear thickness distribution was studied experimentally and numerically for the first time. To assess the performance of gradient grooved tubes (GGTs), the crashworthiness of typical cylindrical specimens and tubes having internal or external grooves with uniform thickness distributions was compared. The results showed that the dynamic crush mode of GGTs was axisymmetric, progressive, and sequential. Furthermore, the mean crushing force (MCF) in GGT tubes was considerably less compared to other tubes (e.g., 89% difference between GGT and non-gradient tube). Moreover, the initial peak forces of all types of tubes having the same number of grooved sections were almost in the same range. However, the crushing force efficiency of GGTs was remarkably lower than other tubes due to their non-uniform load response. The numerical results showed that by increasing the number of grooves in GGTs, peak force, energy efficiency, and axial shortening decreased, but mean crushing and overall crushing forces increased. Altogether, the highest energy efficiency belonged to the GGT specimens, in which 17%, 4.2%, and 96% increases were observed compared to external and internal groove tubes and typical cylindrical tubes, respectively. Also, the energy efficiency increased with the number of grooves.
引用
收藏
页数:16
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