Crushing performance of auxetic tubes under quasi-static and impact loading

Abstract

The aim of this paper is to investigate the energy absorption behavior of some reticulated tubes with different auxetic and non-auxetic wall grid patterns. Re-entrant, Arrow-head and Anti-tetrachiral were the three types of cellular patterns for auxetic reticulated tubes and the conventional Honeycomb pattern was used for the non-auxetic tubes. All of the designed specimens were fabricated by laser rotary cutting machine on steel tubes and the crushing tests were performed by a universal testing machine and drop weight machine for quasi-static and impact loading rates, respectively. Also, the hollow reticulated tubes were filled with Polyurethane foam to investigate the effect of filler on the crushing behavior of these novel tubes. Peak force, mean force, crushing force efficiency, total absorbed energy and specific absorbed energy were used as evaluating parameters. The results illustrate that the auxetic tubes showed a significant increase in SEA, CFE, and EA parameters compared to nonauxetic conventional structures. Foam filling of the structures caused symmetric deformation and shows the benefit of auxetic pattern even in quasi static loading. Also, a numerical analysis was carried out to simulate the experimental tests and a comprehensive discussion 2 is performed and based on the validation of the FE model versus the experimental crushing response the parametric study was conducted to understand further the effects of various loading rates.

Potential and applications of auxetic tubular: a review

“…Usta et al [117] studied the behavior and mechanical response of triggered and non-triggered tubes with auxetic foam under low-velocity impact to investigate EA (SEA) and crash force efficiency (CFE). Doudaran et al [119] conducted an investigation into the behavior of auxetic tubular structures with Re-entrant, arrow-head, and anti-tetrachiral patterns, comparing them with honeycomb tubes under quasi-static loads and impact using a drop weight apparatus. The results revealed that the auxetic tubular structures exhibited a notable increase in parameters such as CFE, SEA, and EA.…”

“…Auxetic tubular structures are a unique class of materials known for their exceptional mechanical properties, including enhanced impact resistance [117][118][119][120]. Characteristic with NPR allows auxetic tubular structures to distribute and absorb impact energy more effectively compared to traditional materials [57,82,105,121].…”