Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (1): 114-121.doi: 10.13229/j.cnki.jdxbgxb20190851

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In-plane dynamic crushing of dual-material structure with negative Poisson′s ratio

Fang-wu MA1,2(),Hong-yu LIANG1,2,Qiang WANG1,Yong-feng PU1()   

  1. 1.State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
    2.Qingdao Automobile Research Institute，Jilin University，Qingdao 266000，China
  • Received:2019-07-12 Online:2021-01-01 Published:2021-01-20
  • Contact: Yong-feng PU E-mail:mikema@jlu.edu.cn;puyongfeng@jlu.edu.cn

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Abstract:

Dual-material auxetic double arrowhead structure with negative Poisson’s ratio was proposed. Under the assumption that all geometric dimensions were the same， the stiff material fraction ψ was introduced. Based on explicit dynamic finite element simulation by LS-DYNA， the in-plane dynamic responses of dual-material auxetic double arrowhead structure with negative Poisson’s ratio were numerically studied. The effects of the stiff material fraction and the impact velocity on the in-plane impact resistance and energy absorption capacities were discussed in detail. In order to obtain better comprehensive performance， a functionally layered honeycomb model was established and the effects of the gradient forms on the peak crush force， specific energy absorption and plat-form stress were investigated. The results show that the platform stress has a great improvement and increases with the fraction of the stiff material， and the influence mechanism on the peak impact force and the specific energy absorption are significantly different from the others. Under the presupposition that the peak impact force was lower， the energy absorption capacity can be improved by reasonable designing gradient forms to realize the control of the energy absorption process.

Key words: vehicle engineering, collision energy absorption, dual-material, gradient distribution, negative Poisson′s ratio, axial impact

CLC Number: 

  • U465.9

Fig.1

Dual-material auxetic double arrowhead cell structure with negative Poisson′s ratio"

Fig.2

Sketch map of model and under in-plane impact"

Fig.3

Effective stress-strain curve"

Fig.4

Energy curve of dual-material auxetic double arrowhead structure with negative Poisson′s ratio"

Fig.5

Nominal stress-strain curve of cellular material"

Fig.6

Stress-strain curves at different impact velocities along the Z direction"

Fig.7

Plateau stress under different loads"

Fig.8

Peak crush force under different loads"

Fig.9

Energy absorption curves at different impact velocities"

Fig.10

Total specific energy absorption under different loads"

Fig.11

Four gradient distribution forms"

Fig.12

Stress-strain curves at different impact velocities under gradient distribution"

Table 1

Main performance indicators under gradient distribution"

指标v/（m·s–1）刚性材料分数分布形式
0%25%50%75%100%“1”“2”“3”“4”
PCF/kN307.188.517.538.9914.157.3514.127.3314.11
7018.9118.9919.5819.4248.5918.9148.7118.9145.57
12023.1023.1023.3823.0963.8723.1060.7023.1064.76
σp/MPa306.406.7710.2811.8715.7410.089.929.669.83
708.6910.2512.8716.1817.9613.3612.8811.5113.13
12013.5016.0619.7824.0526.8321.3918.8019.3920.45
SEA/（J·kg-1）306 7225 1396 8826 1618 1137 3426 8056 9416 878
709 4778 6728 6759 3479 2679 5839 1838 1799 227
12013 15611 15510 44911 77611 43313 04610 06510 91612 554

Fig.13

Deformation pattern diagram of contact moment"

Fig.14

Deformation process under positive gradient distribution"

Fig.15

Energy absorption curves at different impact velocities under gradient distribution"

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