Mechanical Behavior Of Origami Thin-walled Tube Under Impact Loading

Thin-wall tube structure with high specific strength and high specific stiffness has been widely applied in the design of shock energy absorption.In the work on the quasi-static and dynamic mechanical behavior of Thin-wall tubes,including circular,square,hexagonal and octagonal tubes.In this paper,a origami thin-wall structure with arc-shaped origami patterns were proposed,which was based on the experimental study and numerical simulation.The compression deformation and energy absorption of the thin-walled structures with arc-shaped origami patterns were analyzed in detail.The main work is as follows:(1)Within the scope of this paper,the periodic single-cell structure was fabricated by high precision 3D printing technology,and the quasi-static compression experiment was performed using quasi-static compression testing machine.The axial quasi-static crushing of single-cell structure were simulated by using ABAQUS,and the finite element simulation results were compared with the experimental to verify the effectiveness of the model.(2)The out-of-plane quasi-static compression and impact behaviors of origami thin-walled tubes were calculated by finite element method,the deformation modes and energy absorption characteristics were discussed,and the effects of pre-folding angles and the number of thin-walled single-cell tube arrays on their collapse modes and energy absorption were analyzed.The deformation of tubes could be divided into four stages: initial crushing stage,prefolding angle plastic rotation stage,web plastic buckling stage and totally crushed and densification stage.The square tube was compared with the arc-shaped origami patterns with equal-height and equal-mass.For quasi-static compression,the single-cell origami tube with a prefolding angle of 70° has a higher bearing capacity in the prefolding angle plastic rotation stage.It’s specific energy absorption was higher than square tube.For the multiple array tube structures,the specific energy absorption of the unit square tube was higher than origami tubes under quasi-static compression and impact velocity with 10m/s.The peak of initial crushing load in the compression process of the origami tube array model were much smaller than that of the square tube,when considering the crush force efficiency and specific total efficiency,all the origami tube array models were superior to the square tube.When the impact velocity was 20m/s,the origami tube with prefolding Angle of 60° and 70° presents a gradual crushing mode,the peak of initial crushing load was large,in the prefolding angle plastic rotation stage appears a gradual failure mode,and the bearing capacity decreases.It’s crush force efficiency and specific total efficiency were lower than square tube.The origami tube with prefolding Angle of 50° was less affected by impact velocity.It’s crush force efficiency and specific total efficiency were higher than square tube.(3)The in-plane x and y quasi-static crushing and impact behavior was finite element calculation for origami thin-wall tubes.For the in-plane x direction,The deformation of origami tubes could be divided into three stages:initial crushing stage of vertical plate,prefolding part contact stage and totally crushed and densification stage.Under quasi-static compression and the impact loading with velocity of 10m/s,the secondary bearing capacity of the single cell origami tube appears after the prefolding part contact stage,and the origami tube array model generates horizontal constraints between cells during compression.Their specific energy absorption,crush force efficiency and specific total efficiency were higher than square tubes.When the impact velocity was 20m/s,the origami tubes present gradual crushing mode.The bearing capacity of the prefolding part was reduced during compression.The specific energy absorption of square tube array model was higher than origami tubes.The peak initial load of origami tubes in the initial crushing stage of vertical plate were much lower than that of square tube.Their crush force efficiency and specific total efficiency were higher than square tubes.For the in-plane y direction,the deformation of origami tubes could be divided: initial crushing stage,prefolding angle plastic rotation stage,totally crushed and densification stage.Under the quasi-static compression,the specific energy absorption of the origami tube and its array model were higher than that of the square tube.When the impact velocity was10m/s,the origami tube with prefolding Angle of 50° presents overall plastic deformation and larger bearing capacity during the prefolding angle plastic rotation stage.It’s specific energy absorption was higher than square tube.The origami tube with prefolding Angle of 60° and 70° present local deformation and lower bearing capacity during the prefolding angle plastic rotation stage.Their specific energy absorption were lower than square tube.When the impact velocity was 20m/s,origami tubes present gradual crushing mode and lower bearing capacity during the prefolding angle plastic rotation stage.Their specific energy absorption were lower than square tube.Under quasi-static and dynamic impact loads,the peak of initial crushing load of origami tubes were much lower than square tubes and their crush force efficiency and specific total efficiency were higher than square tubes.