Dynamic response of functionally graded cellular materials based on the Voronoi model

Zhang, Jianjun; Wang, Zhi Hua; Zhao, Longmao

doi:10.1016/j.compositesb.2015.09.045

Cited by 92 publications

(35 citation statements)

References 47 publications

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“…4, where E is Young's modulus and t E is Tangent modulus [35]. In this paper, the porous structures are assumed to [21], which is actually reported as an insensitive parameter by other studies [40,41]. out-of-plane deformations, and the all-around randomness can be well simulated.…”

Section: Ls-dyna Is Employed To Solve the Equation Of Motion In Fe Anmentioning

confidence: 99%

Dynamic response and energy absorption of functionally graded porous structures

2018

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This paper is focused on the in-plane crushing of two-dimensional (2D) porous structures with a special attention on the effect of functionally graded (FG) porosities. The dynamic response and energy absorption of closed-cell metal foams with different porosity distributions are investigated by using finite element (FE) analysis. Two symmetric, two asymmetric and one uniform distributions of internal pores along the impact direction are constructed with Voronoi tessellation. The proposed porous structure is crushed under the impact of a rigid panel with a constant velocity. The deformation of cell walls is simulated using a plastic kinematic material model. The erosion criteria and hourglass control are applied to ensure the accuracy of numerical results, which are validated against the experimental data from open literature. The effects of varying parameters on the energy absorption, deformation pattern, and stress-strain curve of the FG porous structure are discussed. The dynamic response is found to be influenced by different random cell geometries, porosity gradients, cell wall thicknesses, internal pore numbers, and impact velocities. The effective way to improve energy absorption capability of the porous structure under a constant-velocity impact is proposed, shedding new insights into the deformation mechanism of the FG porous structure for engineering design.

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Section: Ls-dyna Is Employed To Solve the Equation Of Motion In Fe Anmentioning

confidence: 99%

Dynamic response and energy absorption of functionally graded porous structures

2018

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“…For theoretical analysis of sandwich plate model, the most important parameter was material property of LIPB. Because soft casing was made of aluminum or steel, so the assumption of perfectly-rigid-plastic model [34][35][36] or bi-linear hardening model 37,38 was adopted generally. The homogenized crushable foam model, 10,19,29,33 an extension of Deshpande-Fleck model, [39][40][41] was used in jellyroll core of LIPB by a number of scholars.…”

Section: Introductionmentioning

confidence: 99%

Resistance exterior force property of lithium‐ion pouch batteries with different positive materials

Hao

Xie

et al. 2019

Int J Energy Res

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Summary Lithium‐ion pouch battery (LIPB) is widely applied in different engineering fields, such as electric vehicles, aeronautics, astronautics, and among others. However, few complete mechanical models with deformation field are presented to predict internal short circuit (ISC) and resistance exterior force property of LIPB under exterior loading. In the present research, the indentation theoretical models with sinusoidal shape function are established to investigate resistance exterior force property of batteries with different positive materials under different punch shapes loading. The effects of indentation displacement and deformation region on indentation force are carried out. By the comparison of indentation force, present theoretical and numerical results are consistent with previous experimental results. The indentation force increases with the punch radius increase, but decreases with the indentation displacement increase. On the basis of energy conservation law, it is concluded that LIPB is more likely to produce mechanical failure and ISC when normalized deformation region is greater than or equal to 0.4 and plastic strain energy ratio is greater than or equal to 1.5. In addition, from resistance exterior force property point of view, LIPB has a better property to resist external force when LiMnNiCoO2, rather than LiCoO2 and Nanophosphate, is used as positive material. The research provides a reference for assessing the safety of LIPB and selecting suitable positive material, which possesses high energy capacity and resistance exterior force property.

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“…The energy absorption rate of the bilayer structure under a blast loading was significantly higher than that of the uniform structure. Zhang et al [2016] designed a Voronoi structure with a gradient distribution of member bar material density. The numerical results under impact loading show that the stress at the support end of the density gradient distribution structure increases with increasing impact velocity.…”

Section: Introductionmentioning

confidence: 99%

Novel Gradient Design and Simulation of Voronoi Structures

2018

Int. J. Appl. Mechanics

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The gradient design of a fine grain structure on the surface and coarse grain structure in the substrate gives nano metallic materials both high strength and plasticity. Inspired by the concept of gradient design of grain sizes in materials science, this paper shows the design of the gradient Voronoi polygonal honeycomb structure. The quasi-static uniaxial tensile deformation processes of both, gradient and uniform, Voronoi structures were studied and it was found that the gradient design of the honeycomb cell size greatly improves the tensile property and strain energy storage of the Voronoi structure.

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Dynamic response of functionally graded cellular materials based on the Voronoi model

Cited by 92 publications

References 47 publications

Dynamic response and energy absorption of functionally graded porous structures

Dynamic response and energy absorption of functionally graded porous structures

Resistance exterior force property of lithium‐ion pouch batteries with different positive materials

Novel Gradient Design and Simulation of Voronoi Structures

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