Axial crushing response of multi-cell tube enhanced by secondary ribs like parallel veins

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (1) : 38-45.

HU Jingkun1, XU Peng1, FAN Zhiqiang1,2, LI Yaozhou1， TAN Xiaoli1

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Abstract

Inspired by the parallel veins of leaves, a new bionic multicellular tube (BMT) was constructed by introducing secondary ribs on the inner shell of the lateral cylindrical shell of the multicellular tube (MT) to improve the energy absorption characteristics by inducing and improving the deformation mode of the thin-walled structure. The samples were prepared by 3D printing technology to carry out quasi-static compression experiments. Combined with numerical simulation, the effects of tube wall thickness, impact velocity, secondary rib shape on structural deformation and energy absorption were studied. The results show that: 1) Compared with MT, the specific energy absorption of BMT had tilted secondary ribs increases by 31%~59% and 20% ~ 35.2%. The introduction of secondary ribs can induce the interlacing of thin-walled structures in the direction of ±45°to produce large plastic hinges. The improvement of bending deformation performance of thin-walled structures is the main factor to enhance the energy absorption characteristics of structures. 2) When the width of the secondary ribs of BMT is less than 1mm, the deformation of the outer cylindrical shell cannot be induced, and the energy absorption characteristics of BMT increase with the increase of the impact velocity in the range of 10~70m/s. 3) The introduction of secondary ribs has little effect on the energy absorption of main ribs and inner shell in MT, but can significantly improve the energy absorption of outer shell and reduce the dependence of deformation mode on loading rate.

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Bionic multi-cell tube / mean crushing force / energy absorption / deformation pattern

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HU Jingkun1, XU Peng1, FAN Zhiqiang1,2, LI Yaozhou1， TAN Xiaoli1. Axial crushing response of multi-cell tube enhanced by secondary ribs like parallel veins[J]. Journal of Vibration and Shock, 2023, 42(1): 38-45

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