Crushing Behavior of Hierarchical Hexagonal Thin-Walled Steel Tubes Under Oblique Impact
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International Journal of Steel Structures https://doi.org/10.1007/s13296-020-00428-z
Crushing Behavior of Hierarchical Hexagonal Thin‑Walled Steel Tubes Under Oblique Impact Weiwei Li1,2 · Hualin Fan1 Received: 10 March 2020 / Accepted: 16 October 2020 © Korean Society of Steel Construction 2020
Abstract In this paper, oblique crushing behaviors of the hierarchical hexagonal steel tubes were investigated. In the oblique impact, the crushing mode transfers from axial crushing dominated mode to bending dominated mode with the increase of the impact angle. In normal impact, the hierarchical steel tubes have progressive folding and global folding, depending on the cell number and the thickness of the sandwich wall. There are two hybrid crushing modes at oblique impact, progressivefolding-bending (hybrid mode II) and global-folding-bending (hybrid mode III). Before the hybrid crushing mode appears, the peak force is reduced but the energy absorbing performance changes little compared with the normal impact. When the impact angle is 10°, the hierarchical steel tube still has excellent energy absorption. It is also found that when the cell number in the sandwich wall changes from 4 to 6, the crushing mode at the impact angle of 10° transfers from progressive folding, hybrid folding II to hybrid folding III, while the crushing mode at normal impact transforms from progressive folding, hybrid folding I to global folding. It is found that adopting hierarchical topology can greatly improve the energy absorption at oblique impact, even better than that of the normally impacted single-cell tubes. Keywords Hierarchical tubular steel structure · Oblique impact · Crushing mode · Energy absorption
1 Introduction Thin-walled structures have been widely applied in vehicles, aircrafts and protective structures for their effective energy saving, light weight and low manufacturing cost. Most investigations were focused on axial impact behaviors (Hong et al. 2016; Wang et al. 2019 and Wu et al. 2020). However, under real impacts, especially in traffic vehicle collisions, the load is rarely pure axial crushing or pure bending, but a combination of axial and non-axial (oblique) loads. Such a load combination leads to hybrid crushing patterns, which might reduce the energy absorption efficiency of the thin-walled tube. Therefore, How to improve the performance of these * Hualin Fan [email protected] 1
State Key Laboratory of Mechanics and Control of Mechanical Structures, Research Center of Lightweight Structures and Intelligent Manufacturing, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, China
Department of Civil Engineering, Nanyang Institute of Technology, Nanyang 473004, China
2
structures (for example collision box, and crash barrier) under oblique impact is attractive for researchers. Hierarchical topology may be one of the solution. Tran and Baroutaji (2018) and Tran et al. (2014) investigated the energy absorption (EA) of multi-cell tubular structures. Qiu et al. (2015) claimed th
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