Phenomenon of Local Densification in Negative Graded Metal Foam

LIU Mian; WANG Genwei; SONG Hui; WANG Bin

doi:10.11858/gywlxb.20190866

Volume 34 Issue 4

Jul 2020

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Chinese Journal of High Pressure Physics > 2020 > 34(4): 044204.

LIU Mian, WANG Genwei, SONG Hui, WANG Bin. Phenomenon of Local Densification in Negative Graded Metal Foam[J]. Chinese Journal of High Pressure Physics, 2020, 34(4): 044204. doi: 10.11858/gywlxb.20190866

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LIU Mian, WANG Genwei, SONG Hui, WANG Bin. Phenomenon of Local Densification in Negative Graded Metal Foam[J]. Chinese Journal of High Pressure Physics, 2020, 34(4): 044204. doi: 10.11858/gywlxb.20190866

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Phenomenon of Local Densification in Negative Graded Metal Foam

doi: 10.11858/gywlxb.20190866

LIU Mian^{1, 2
,},
WANG Genwei^{1, 2,*
,
,},
SONG Hui^{1, 2},
WANG Bin^{1, 3}

1.
Institute of Applied Mechanics, College of Mechanical and Vehicle Engineering of Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2.
Shanxi Key Laboratory of Material Strength & Structural Impact, Taiyuan 030024, Shanxi, China
3.
Department of Mechanical and Aerospace Engineering, Brunel University London, London, UB8 3PH, UK

Received Date: 12 Dec 2019
Rev Recd Date: 28 Dec 2019

Abstract

Abstract

Based on the one-dimensional nonlinear rigid-plastic hardening (R-PH) model, the control equations and mechanical response characteristics of the shock wave propagation of the negative graded foam under constant velocity impact are studied. The LS-DYNA finite element software is used to numerically simulate the graded metal foam model generated by the three-dimensional stochastic Voronoi technology to verify the theoretical prediction. The local densification strain and the second critical velocity of the graded foam material under the shock wave model are defined. By studying the effects of impact velocity, density gradient and relative density parameters, it is found that the theoretical solution of the shock wave model is in good agreement with the numerical solution of the finite element model. The shock wave theory based on the R-PH model can better predict the negative graded foam metal. The mechanical properties of the local densification strain have three growth stages at different impact velocities; the larger the absolute value of the density gradient and the relative density, the smaller the local densification strain and the larger the second critical velocity. Finally, the effect of local densification on the stress at the support end in the negative graded foam is explained.
- graded metal foam,
- shock wave,
- local densification strain,
- the second critical velocity

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References(33)

References

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Phenomenon of Local Densification in Negative Graded Metal Foam

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