Experimental Investigation on the Energy Absorption of Lattice Thin-Walled Metal Tubes with Auxetic, Semi-Re-Entrant, and Conventional Honeycomb Cells under Axial Loading

Najar, Mosayeb; Ghajar, Rahmatollah

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Volume 24, Issue 5 (May 2024) Modares Mechanical Engineering 2024, 24(5): 293-303 | Back to browse issues page

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Najar M, Ghajar R. Experimental Investigation on the Energy Absorption of Lattice Thin-Walled Metal Tubes with Auxetic, Semi-Re-Entrant, and Conventional Honeycomb Cells under Axial Loading. Modares Mechanical Engineering 2024; 24 (5) :293-303
URL: http://mme.modares.ac.ir/article-15-74698-en.html

Experimental Investigation on the Energy Absorption of Lattice Thin-Walled Metal Tubes with Auxetic, Semi-Re-Entrant, and Conventional Honeycomb Cells under Axial Loading

Mosayeb Najar¹

, Rahmatollah Ghajar ^*

1- Khajeh Nasir Toosi University of Technology
2- Khajeh Nasir Toosi University of Technology , ghajar@kntu.ac.ir

Abstract: (325 Views)

This research aims to experimentally investigate the energy absorption of thin-walled lattice tubes with a square section. The walls of the thin-walled tube are made in the form of a lattice with three types of cells: re-entrant auxetic, semi-re-entrant, and conventional honeycomb structures, and the material of the specimens is considered 304 stainless steels. All three types of lattice cells are produced by the rotary laser cutting method on a conventional tube and are axially compressed by a universal test machine under quasi-static loading at a 5 mm/min velocity. The test evaluation parameters are initial maximum force, mean crushing force, crushing force efficiency, energy absorption, and specific energy absorption. The results show that the thin-walled tube with the re-entrant auxetic structure has more specific energy absorption than the other two structures. The specific energy absorption of this structure is 25% higher than the conventional honeycomb structure. The semi-re-entrant structure has more energy absorption and mean crushing force than the other structures. The crushing force efficiency in the conventional honeycomb structure is higher than that of the other two structures, which has a value of 85%.

Keywords: Auxetic, Semi-Re-Entrant, Specific Energy, Thin-Walled Tube, Quasi-Static

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Article Type: Original Research | Subject: Aerospace Structures
Received: 2024/04/15 | Accepted: 2024/07/27 | Published: 2024/04/29

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