Investigation of a rectangular energy absorber with a near-ovoid internal lattice structure for use in a train buffer system

Fakhri Vayqan, Hossein; Tahooneh, Pooyan; Hosseini Tehrani, Parisa

doi:10.22068/ijrare.351

Volume 11, Issue 2 (9-2024) IJRARE 2024, 11(2): 1-10 | Back to browse issues page

‎ 10.22068/ijrare.351

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Fakhri Vayqan H, Tahooneh P, Hosseini Tehrani P. Investigation of a rectangular energy absorber with a near-ovoid internal lattice structure for use in a train buffer system. IJRARE 2024; 11 (2) :1-10
URL: http://ijrare.iust.ac.ir/article-1-351-en.html

Investigation of a rectangular energy absorber with a near-ovoid internal lattice structure for use in a train buffer system

Hossein Fakhri Vayqan

, Pooyan Tahooneh

, Parisa Hosseini Tehrani

School of Railway Engineering, Iran University of Science & Technology

Abstract: (169 Views)

In this study, a thin-walled tube with a near-ovoid-lattice internal cell (OLC) made of stainless steel is introduced. The crashworthiness performance of the presented structure in railway applications is investigated. The crash behavior of the OLC structure is simulated using the explicit finite element code LS-DYNA under various loading scenarios, including axial, offset, and oblique loading. To validate these results, simulations of a rectangular thin-walled tube with diaphragms are conducted, and the numerical outcomes are compared against existing experimental data for accuracy. Based on the results, the OLC design exhibits enhanced energy absorption capabilities. By integrating the lattice structure into the crashworthy configuration, a significant increase of 36.24% in energy absorption and a substantial 11.94% rise in specific energy absorption are observed. Moreover, a notable 25.91% improvement is seen in the crushing force efficiency, indicating a more balanced distribution of force with a flatter curve due to a greater mean force than peak force. Additionally, consistent crushing behavior up to 40 mm under offset loading and 15 degrees under oblique loading in the OLC design is seen, and its energy absorption is maintained at a constant level.

Keywords: Crashworthiness, Thin-walled tube, Lattice structure, Railway, Offset loading

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Type of Study: Research | Subject: Rolling Stock