Micro-structural motivated phenomenological modelling of metal foams: experiments and modelling

Jung, Anne; Grammes, Thilo; Diebels, Stefan

doi:10.1007/s00419-014-0942-y

Cited by 10 publications

(5 citation statements)

References 29 publications

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“…into account. Some first modeling approaches going in this direction can be found in recent literature …”

Section: Resultsmentioning

confidence: 99%

“…However, as mentioned above, macroscopic yielding of foams only appears similar to plasticity but in reality, it is connected to damage, fracture, and instability problems such as buckling of the individual struts forming the mesostructure of the foams . Hence, yield surfaces to describe this apparent plastic behavior of metal foams are deduced from that of plastic materials such as metals or granular materials although there is a different underlying mechanism for the macroscopic response.…”

Section: Yielding Behavior Of Cellular Materialsmentioning

confidence: 99%

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Yield surfaces for solid foams: A review on experimental characterization and modeling

Jung

Diebels

2018

GAMM-Mitteilungen

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Solid foams are a very important class of lightweight materials with energy absorption properties for application in automotive and aerospace industry. In such applications, foams are subjected not only to uniaxial but in most cases to very complex multiaxial stress states. Hence, yield surfaces are needed for the reliable prediction of the failure behavior by simulations under multiaxial loading. As multiaxial loading of cellular solids is a very challenging task, in literature, yield surfaces are usually based mainly on simulation results not validated by real experimental data sets. The present contribution starts with a review of the theory of yield surfaces and numerical models. It gives a deep insight into the state of the art on the experimental assessment of yield surfaces for solid foams. Finally, a yield surface and its post‐yield surfaces are determined exemplarily for open‐cell aluminum foams by using a multitude of experimental methods.

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“…into account. Some first modeling approaches going in this direction can be found in recent literature …”

Section: Resultsmentioning

confidence: 99%

Section: Yielding Behavior Of Cellular Materialsmentioning

confidence: 99%

Yield surfaces for solid foams: A review on experimental characterization and modeling

Jung

Diebels

2018

GAMM-Mitteilungen

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“…The initial linear slope was utilized to determine the Young's modulus, reflecting the linear elasticity of the scaffolds, followed by a stress plateau (plastic region). This stage concludes with pore compaction leading to the breakage of individual pores and finally, densification 34 of the scaffolds between 55 and 60% strain. The addition of 0.5% of GG to polyHIPE compositions (P-GG 0%) resulted in a reduction of the Young's modulus and 0.2% offset yield strength of the scaffolds from 4.8 ± 0.99 MPa to 3.77 ± 0.35 MPa and from 0.38 ± 0.01 to 0.25 ± 0.04 MPa, respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

Synthesis and Characterization of PolyHIPE-Gellan Gum Material with Tunable Macroporosity for Tissue Engineering Applications

Akbari,

Kroon,

Parihar

et al. 2024

Macromolecules

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Polymerized high internal phase emulsions (poly-HIPEs) were combined with gellan gum (GG) in an innovative approach. Four GG concentrations in polyHIPEs (P-GG 0%, P-GG 0.1%, P-GG 0.5%, and P-GG 1%) were explored for their impact on polyHIPE materials. The resulting macroporous polyHIPE-GG (P-GG) scaffolds exhibited up to 95% porosity and remarkable interconnectivity. Elevating GG concentration correlated with larger pore sizes, increased hydrophilicity, and degradability. Scanning electron microscopy (SEM) and X-ray microcomputed tomography provided insights into the structural influence of GG on polyHIPE materials. Pore sizes ranged from 32 to 1036 μm. In vitro Live/Dead assay confirmed the cytocompatibility of these scaffolds with human fibroblast cells, showcasing their potential for mimicking cartilage and bone tissue structures, promoting cell activities, nutrient exchange, supporting various cell lines, and facilitating vascularization.

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“…Geometry modeling (cell shape, meshing) has a governing influence on the process of finite element modeling (FEM) and analysis (FEA). There are numerous approaches to generate optimised geometry and representative volume, aiming to closely resemble the real structure, but also to consider computer resources and computational time [32,33,34,35,36,37]. Establishment of the relationship between changes at the micro scale and their influence on macro level properties is important, since it can enable suitable tailoring of the physical characteristics of foam.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling and Experimental Behavior of Closed-Cell Aluminum Foam Fabricated by the Gas Blowing Method under Compressive Loading

et al. 2019

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This paper deals with the experimental and numerical study of closed-cell aluminum-based foam under compressive loading. Experimental samples were produced by the gas blowing method. Foam samples had an average cell size of around 1 mm, with sizes in the range 0.5–5 mm, and foam density of 0.6 g/cm3. Foam samples were subjected to a uniaxial compression test, at a displacement rate of 0.001 mm/s. Load and stress were monitored as the functions of extension and strain, respectively. For numerical modeling, CT scan images of experimental samples were used to create a volume model. Solid 3D quadratic tetrahedron mesh with TETRA 10-node elements was applied, with isotropic material behavior. A nonlinear static test with an elasto-plastic model was used in the numerical simulation, with von Mises criteria, and strain was kept below 10% by the software. Uniform compressive loading was set up over the top sample surface, in the y-axis direction only. Experimental tests showed that a 90 kN load produced complete failure of the sample, and three zones were exhibited: an elastic region, a rather uniform plateau region (around 23 MPa) and a densification region that started around 35 MPa. Yielding, or collapse stress, was achieved around 20 MPa. The densification region and a rapid rise in stress began at around 52% of sample deformation. The numerical model showed both compressive and tensile stresses within the complex stress field, indicating that shear also had a prominent role. Mainly compressive stresses were exhibited in the zones of the larger cells, whereas tensile stresses occurred in zones with an increased number of small cells and thin cell walls.

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Micro-structural motivated phenomenological modelling of metal foams: experiments and modelling

Cited by 10 publications

References 29 publications

Yield surfaces for solid foams: A review on experimental characterization and modeling

Yield surfaces for solid foams: A review on experimental characterization and modeling

Synthesis and Characterization of PolyHIPE-Gellan Gum Material with Tunable Macroporosity for Tissue Engineering Applications

Numerical Modeling and Experimental Behavior of Closed-Cell Aluminum Foam Fabricated by the Gas Blowing Method under Compressive Loading

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