Influence of cell wall thickness variations on elastic stiffness of closed-cell cellular solids

Grenestedt, Joachim L.; Bassinet, Franck

doi:10.1016/s0020-7403(99)00054-5

Cited by 94 publications

(40 citation statements)

References 9 publications

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“…2) represent a volume of material that is "lost" in a structural sense since it carries little or no load. Values of C E lower than predicted by theory are not unusual, and several other studies, both theoretical and experimental, have demonstrated that stiffness strongly depends on the architecture of foams [27][28][29][30][31][32][33][34][35].…”

Section: Elastic Propertiesmentioning

confidence: 69%

Deformation of open-cell aluminum foam

2001

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Abstract-The mechanical properties of high-purity aluminum foams produced by replication from salt precursors are measured in compression. These foams have homogeneous open-porosity, cell sizes equivalent to the particle size of the precursor salt (ෂ500 µm in this case) and relative densities near 25%. Deformation is uniform and strain hardening similar to the bulk material is observed without a plateau stress. A simple analytical model based on beam theory is employed to describe the flow stress and the change in stiffness of the foams as a consequence of compression. This model leads to a modified scaling law for the flow stress of metallic foams. 

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Section: Elastic Propertiesmentioning

confidence: 69%

Deformation of open-cell aluminum foam

2001

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“…Thus, despite the fact that cellular metals are attractive materials for energy absorption, only limited data are available for dynamic strain rates (> 10 3 s −1 ). The deformation behavior of metallic foams can vary significantly by changing the intrinsic cell structures, such as imperfections (wavy distortions of cell walls), 30,31) microstructure of cell edge materials and cell morphology. For example, Thornton and Magee 32) reported the effect of heat treatment on the mechanical property of as-cast and heat-treated 7075 aluminum foams with a relative density of approximately 0.1 in compression at a static strain rate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cell Size on the Dynamic Compressive Properties of Open-Celled Aluminum Foams

et al. 2002

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In the present paper, open-celled AA6101-T6 aluminum foams, Duocel, with virtually the same relative density of 0.09 were tested at both a dynamic strain rate of 1.2×10 3 s −1 and quasi-static strain rate of 1×10 −3 s −1 in compression at room temperature. These Duocel foams have different cell sizes (10, 20, and 40 ppi) but similar cell morphology and microstructure. The mechanical strength and energy absorption of these foams were characterized as a function of strain rate and cell morphology. Experimental results indicated that the mechanical responses of Duocel foams were independent of the cell size and strain rate. Similar tests were also conducted with fully dense AA6101-T6 aluminum alloy and the results were compared with those obtained from the foam materials.

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“…Grenestedt and Bassinet [18] used a flat faced closedcell Kelvin structure to analyze the influence of non-uniform cell wall thickness on the stiffness of a closed-cell foam. The variations in the thickness of cell walls were quite large, with the thickest walls being 19 times thicker than the thinnest ones.…”

Section: Effects Of Defectsmentioning

confidence: 99%

Modeling of the role of defects in sintered FeCrAlY foams

Kepets

Dowling

2007

Acta Mech Sin

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The metal sintering approach offers a costeffective means for the mass-production of open-cell foams from a range of materials, including high-temperature steel alloys, which offer novel mechanical and acoustic properties. In a separate experimental study, the mechanical properties of open-celled steel alloy (FeCrAlY) foams have been characterized under uniaxial compression and shear loading. Compared to predictions from established models, a significant knockdown in material properties was observed. This knockdown was attributed to the presence of defects throughout the microstructure that result from the unique fabrication process. In the present paper, the microstructure of sintered FeCrAlY foams was modeled by using a finite element (FE) model. In particular, microstructural variations were introduced to a base lattice, and the effects on the strength and stiffness calculated. A range of defects identified under scanning electronic microscope (SEM) imaging were considered including broken ligaments, thickness variations, and pore blockages, which are the three primary imperfections observed in sintered foams. The corresponding levels of defect present in the material were subsequently input into the FE The project supported by the National

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Influence of cell wall thickness variations on elastic stiffness of closed-cell cellular solids

Cited by 94 publications

References 9 publications

Deformation of open-cell aluminum foam

Deformation of open-cell aluminum foam

Effect of Cell Size on the Dynamic Compressive Properties of Open-Celled Aluminum Foams

Modeling of the role of defects in sintered FeCrAlY foams

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