Mechanical properties of a novel nested tube and its application as anti-explosion layer

In order to further improve the energy dissipation capacity of regular circular tube as anti-explosion layer, a novel circular-vein branch nested tube (CVBNT) is proposed based on lotus leaf vein branched structure. The numerical simulation model of CVBNT under lateral quasi-static compression is firstly established and effectively verified. Then, the circular-triangular nested tube system and CVBNT are compared and analyzed from the aspects of response curve, energy absorption capacity and deformation mode. The introduction of the vein branch thin-walled plates affects the deformation mechanism and leads to more plastic hinges, which will greatly improve the energy absorption capacity. The blast mitigation performance of CVBNT as an anti-explosion layer is also studied. Results show that the deformation mechanism of CVBNT under explosion load is very different from that under quasi-static state. CVBNT can effectively alleviate the impact of explosive loads, which further avoids damage to the protected structure. The parametric analysis of structural parameters demonstrate that the reasonable selection of structural parameters is conducive to maximize the energy absorption capacity of CVBNT as an anti-explosion layer. The results of this study will be helpful to design novel thin-walled structure with better explosion resistance performance. [Display omitted]