Abstract

Abstract In this paper, new designed circumferentially corrugated square tubes (CCSTs) with cosine and triangular corrugation cross-sectional profiles, respectively, are proposed for energy absorption. Three types of cross inner ribs, namely, crisscross, X shape and star shape, are introduced to induce the deformation of CCSTs. Quasi-static crushing test and finite element simulation were used to investigate the crushing performance of the CCSTs. The results showed that all triangular profile CCSTs can not deform stably, and only the crisscross inner rib can induce the cosine profile CCSTs to deform progressively. The performance of cosine profile CCSTs with crisscross inner rib (i.e., CTC_C) under different geometric parameters was therefore further studied. It was found that the CTC_C develops four different deformation modes, and the ordered progressive mode Ⅱ (OPM Ⅱ) showed better energy absorption efficiency than the other modes. Finally, a theoretical model based on Simplified Super Folding Element method was presented to predict the mean crushing force of CTC_C deforming with OPM Ⅱ. By comparing with the experimental and FE results, the theoretical model was proved to be very accurate.

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