Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (5): 1584-1592.doi: 10.13229/j.cnki.jdxbgxb20190272

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Energy absorption properties of multi-corner thin-walled columns with double surface gradients

Jun-xian ZHOU1(),Rui-xian QIN1,Bing-zhi CHEN2()   

  1. 1. College of Mechanical Engineering, Dalian Jiaotong University, Dalian 116021, China
    2. College of Locomotive and Vehicle Engineering, Dalian Jiaotong University, Dalian 116021, China
  • Received:2019-03-26 Online:2019-09-01 Published:2019-09-11
  • Contact: Bing-zhi CHEN E-mail:zhoujunxian2013@126.com;chenbingzhi06@hotmail.com

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Abstract:

Graded thickness and multi-corner designs are two efficient strategies to improve the energy dissipation of thin-walled tubes. In this study, the mechanical properties of multi-corner structures (square and nonconvex multi-corner tubes) with double surface gradients subjected to axial load were theoretically and numerically studied. An analytical formulation for the mean load of these types of novel structures was derived using the super folding element theory. The theoretical predictions agreed well with the simulation results obtained using the ANSYS/LS-DYNA software. The results show that increasing the corner number and thickness gradient can improve the energy-absorption efficiency. The combination of nonconvex multi-corner structures and double-surface gradients can lead to the increase in the specific energy absorption as high as 148% to 205% when compared to a square tube with a uniform thickness. This fully demonstrates the high efficiency of this type of combination in improving the crashworthiness of thin-walled structures.

Key words: thin-walled structure, axial crushing, graded thickness, energy absorption, collapse mode

CLC Number: 

  • O342

Fig.1

Folding mechanisms of basic elements"

Fig.2

Cross-sections"

Fig.3

Cross section of a square tube with a double surface gradient"

Fig.4

Type I folding element"

Fig.5

Load conditions of simulations"

Fig.6

FE model of specimens with triggers"

Fig. 7

Material distributions of two types of specimens"

Fig.8

Tensile stress-strain curve of AA6060 T4"

Fig.9

Deformation patterns of columns"

Fig.10

Crushing force-displacement curves"

Table 1

Analytical and numerical solutions of the crushing responses"

试件 仿真结果 理论值E q(37): δ = 0.70 , ? D a = 1.3 修正后的理论值E q(37): δ = δ n
F ˉ n /kN F m a x /kN CFE/% SEA/(kJ·kg-1) P m /kN Error /% δ n D P m /kN Error/%
SQU(1.2,1.2) 7.81 24.93 31.32 7.53 9.27 18.69 0.75 1.2 8.32 6.53
SQU(1.3,1.1) 8.46 25.10 33.70 8.15 9.72 14.85 0.75 1.2 8.73 3.19
SQU(1.4,1.0) 9.26 25.23 36.70 8.81 10.18 9.93 0.74 1.2 9.04 2.37
SQU(1.5,0.9) 9.92 25.29 39.22 9.43 10.72 8.06 0.74 1.2 9.76 1.61
SQU(1.6,0.8) 10.42 25.41 41.00 9.91 11.16 7.10 0.74 1.2 10.16 2.49
SQU(1.7,0.7) 10.87 25.64 42.39 10.20 11.58 6.53 0.73 1.2 10.68 1.74
SQU(1.8,0.6) 11.37 25.88 43.93 10.81 12.05 5.98 0.74 1.2 10.97 3.51
NCMC12(1.2,1.2) 20.53 33.54 61.21 18.74 20.99 2.24 0.71 1.3 21.58 5.11
NCMC12(1.3,1.1) 21.68 33.77 64.19 19.51 21.69 0.01 0.70 1.3 22.62 4.33
NCMC12(1.4,1.0) 22.90 34.02 67.31 20.61 22.57 1.44 0.70 1.3 23.53 2.75
NCMC12(1.5,0.9) 24.49 33.44 73.23 21.72 23.27 4.98 0.69 1.3 24.61 0.48
NCMC12(1.6,0.8) 25.16 34.71 72.48 22.32 24.14 4.05 0.69 1.3 25.93 3.06
NCMC12(1.7,0.7) 26.35 35.09 75.09 23.04 24.95 5.31 0.68 1.3 26.78 1.63
NCMC12(1.8,0.6) 23.87 35.21 67.79 21.79 25.71 7.70 0.71 1.3 26.43 10.74
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