A 3D mesoscopic model for the closed-cell metallic foams subjected to static and dynamic loadings

Fang, Qin; Zhang, Jinhua; Zhang, Yadong; Wu, Hao; Gong, Ziming

doi:10.1016/j.ijimpeng.2014.10.009

Cited by 52 publications

(22 citation statements)

References 33 publications

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“…Gaitanaros et al (2012) established a numerical model and found that open-cell metal foam absorbed more energy while increasing the impact velocity. Investigations on the closed-cell metal foam carried out by Fang et al (2014) also validated this conclusion. Liu et al (2009) studied the kinetic and internal energy of metal foam under impact, and found that as the impact velocity increases, the kinetic and internal energy increases significantly due to inertia effect.…”

Section: Introductionsupporting

confidence: 57%

Investigations on the mechanism and behavior of dynamic energy absorption of metal foam

Luo

Xue

2018

Lat. Am. j. solids struct.

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Metal foams have been widely used in the engineering fields due to its excellent energy absorption capacity under impact. Under different impact velocities, metal foam exhibits different energy absorption properties. It is important to investigate the mechanism and behavior of energy absorption of metal foam under impact. In this study, a 3D microscopic finite element model (FEM) of metal foam is first established to study energy absorption properties of metal foam. It is shown that the impact energy transfers into kinetic and internal energy of metal foam which varies under impact. The variation can be explained by plastic shock wave, which is produced and then propagates under impact. The theoretical model is proposed to discuss and predict kinetic energy and the difference between dynamic and quasistatic energy absorption behavior of metal foam. Effects of inertia and base material strain rate on plastic shock wave are investigated, and the mechanism of the two effects on dynamic energy absorption properties are studied. The results indicate that base material strain rate effect resists the formation of plastic shock wave, and leads to smaller kinetic energy, but higher internal energy.

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Section: Introductionsupporting

confidence: 57%

Investigations on the mechanism and behavior of dynamic energy absorption of metal foam

Luo

Xue

2018

Lat. Am. j. solids struct.

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“…Although the effect of internal gas is neglected in the present FE model, it has been confirmed that the trapped gas hardly affects the foam strength of aluminium foams according to the previous analytical estimate [25] and numerical simulation [26]. However, the gas effect could be significant at the compression densification stage [26] or when the initial gas pressure is much higher than atmosphere pressure [27].…”

Section: Strain-rate Sensitivities Of the Compressive And Tensile Strsupporting

confidence: 56%

“…However, the gas effect could be significant at the compression densification stage [26] or when the initial gas pressure is much higher than atmosphere pressure [27].…”

Section: Strain-rate Sensitivities Of the Compressive And Tensile Strmentioning

confidence: 99%

Strain-rate sensitivity of foam materials: A numerical study using 3D image-based finite element model

Sun

Withers

2015

EPJ Web of Conferences

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Abstract. Realistic simulations are increasingly demanded to clarify the dynamic behaviour of foam materials, because, on one hand, the significant variability (e.g. 20% scatter band) of foam properties and the lack of reliable dynamic test methods for foams bring particular difficulty to accurately evaluate the strain-rate sensitivity in experiments; while on the other hand numerical models based on idealised cell structures (e.g. Kelvin and Voronoi) may not be sufficiently representative to capture the actual structural effect. To overcome these limitations, the strain-rate sensitivity of the compressive and tensile properties of closed-cell aluminium Alporas foam is investigated in this study by means of meso-scale realistic finite element (FE) simulations. The FE modelling method based on X-ray computed tomography (CT) image is introduced first, as well as its applications to foam materials. Then the compression and tension of Alporas foam at a wide variety of applied nominal strain-rates are simulated using FE model constructed from the actual cell geometry obtained from the CT image. The stain-rate sensitivity of compressive strength (collapse stress) and tensile strength (0.2% offset yield point) are evaluated when considering different cell-wall material properties. The numerical results show that the rate dependence of cell-wall material is the main cause of the strain-rate hardening of the compressive and tensile strengths at low and intermediate strain-rates. When the strain-rate is sufficiently high, shock compression is initiated, which significantly enhances the stress at the loading end and has complicated effect on the stress at the supporting end. The plastic tensile wave effect is evident at high strain-rates, but shock tension cannot develop in Alporas foam due to the softening associated with single fracture process zone occurring in tensile response. In all cases the micro inertia of individual cell walls subjected to localised deformation is found to have negligible effect on the macro strain-rate sensitivity of Alporas foam.

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“…The 8 mm and 10 mm thickness foam geometries had a total of 2,063,373 and 2,654,251 elements respectively. This number of elements and the size of elements were compared with similar studies in the literature [40][41][42] and comparatively, this mesh is relatively fine. Mie-Gruneisen Equation of State (EOS) with a linear Us-up was also used for both flyer-plate models.…”

Section: Finite Element Modellingmentioning

confidence: 99%

Modelling and characterization of cell collapse in aluminium foams during dynamic loading

Kader

Islam

Hazell

et al. 2016

International Journal of Impact Engineering

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A B S T R A C TPlate-impact experiments have been conducted to investigate the elastic-plastic behaviour of shock wave propagation and pore collapse mechanisms of closed-cell aluminium foams. FE modelling using a mesoscale approach has been carried out with the FE software ABAQUS/Explicit. A micro-computed tomographybased foam geometry has been developed and microstructural changes with time have been investigated to explore the effects of wave propagation. Special attention has been given to the pore collapse mechanism. The effect of velocity variations on deformation has been elucidated with three different impact conditions using the plate-impact method. Free surface velocity (ufs) was measured on the rear of the sample to understand the evolution of the compaction. At low impact velocities, the free-surface velocity increased gradually, whereas an abrupt rise of free-surface velocity was found at an impact velocity of 845 m/s with a copper flyer-plate which correlates with the appearance of shock. A good correlation was found between experimental results and FE predictions.

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A 3D mesoscopic model for the closed-cell metallic foams subjected to static and dynamic loadings

Cited by 52 publications

References 33 publications

Investigations on the mechanism and behavior of dynamic energy absorption of metal foam

Investigations on the mechanism and behavior of dynamic energy absorption of metal foam

Strain-rate sensitivity of foam materials: A numerical study using 3D image-based finite element model

Modelling and characterization of cell collapse in aluminium foams during dynamic loading

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