Finite element micromechanics model of impact compression of closed-cell polymer foams

Mills, N. J.; Stämpfli, Rolf; Marone, Federica; Brühwiler, Paul A.

doi:10.1016/j.ijsolstr.2008.09.012

Cited by 76 publications

(49 citation statements)

References 22 publications

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“…The material's mechanical behavior depends on the density, loading strain rate and it is also affected by the manufacturing process. This dependency attracted many researchers trying to characterize those materials under quasi-static and dynamic loading [1,[6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Comparing the mechanical performance of synthetic and natural cellular materials

et al. 2015

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a b s t r a c tThis work compares the mechanical performance of agglomerated cork against synthetic materials typically used as impact energy absorbers. Particularly, the study will focus on the expanded polystyrene (EPS) and expanded polypropylene (EPP).Firstly, quasi-static compression tests are performed in order to assess the energy storage capacity and to characterize the stress-strain behavior cellular materials under study. Secondly, guided drop tests are performed to study the response of these materials when subjected to multiple dynamic loading (two impacts). Thirdly, finite element analysis (FEA) is carried out in order to simulate the compressive behavior of the studied materials under dynamic loading.Results show that agglomerated cork is an excellent alternative to the synthetic materials. Not only for being a natural and sustainable material but also for withstanding considerable impact energies. In addition, its capacity to keep some of its initial properties after loading (regarding mechanical properties and dimensions) makes this material highly desirable for multiple-impact applications.

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Section: Introductionmentioning

confidence: 99%

Comparing the mechanical performance of synthetic and natural cellular materials

et al. 2015

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“…There are many studies in literature that present constitutive models and methods for calculating the foam behaviour [11,12,17]. EPS foam is a particle foam made by expanding polystyrene beads that contain a blowing agent -usually pentane.…”

Section: Uniform Foam Modelmentioning

confidence: 99%

“…Unfortunately, none of these studies were done on EPS foam. The data in these papers can help to construct and validate predictive models, however, because this material is multi-scale (constitutive beads at the mesoscopic scale, that are made of microscopic closed cells) [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Dynamic compressive strength and crushing properties of expanded polystyrene foam for different strain rates and different temperatures

et al. 2016

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In this study, static and dynamic compression and crushing tests were conducted on expanded polystyrene (EPS) foam for material characterisation at high strain rates. This was done to obtain the stress-strain curve for different temperatures and densities. An influence of the strain rate on the experimental data was shown. The resulting curves for modelling were extracted from the experimental data, which were obtained from high speed drop tower tests. The methodology for the processing of the experimental data for use in the finite element (FE) modelling was presented. The foam material model of LS-Dyna was used to simulate the dynamic compression process. This model is dedicated to modelling crushable foam with optional damping, tension cut-off, and strain rate effects. The adjustment of the material parameters for successful modelling has been reported. This FE model of EPS foam was validated with experimental data using impact on a "kerbstone" support. This model can be applied for simulation of dynamic loads on a bicycle helmet. It is useful for designing a reliable bicycle helmet geometry for different types of accidents.

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“…On the contrary, the Kelvin's cell has attracted the attention of many researchers and they have developed models to simulate the mechanical properties of many types of foam materials based on the Kelvin unit cell. [5][6][7][8][9][10] Modeling the foam microstructure based on the idealized Kelvin cell ranged from considering that the foam consists of regularly arranged Kelvin cells with a constant wall thickness 5,6 to a more complicated idealization taking into consideration the irregularity and imperfection in the real foam internal structure. These irregularities include the solid distribution between foam cells and walls 7,8,10 and the foam cell curvature.…”

Section: Literature Reviewmentioning

confidence: 99%

Finite element modeling of compression behavior of extruded polystyrene foam using X-ray tomography

Sadek

Fouad

2013

Journal of Cellular Plastics

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Extruded polystyrene rigid foams have attracted a great attention as a superior loadbearing thermal insulation material since their implementation in building construction. One of the most common application areas of this type of thermal insulation material is under raft foundations, where the foam normally undergoes high levels of compression loads. The purpose of this research is to determine how to simulate and optimize the structural response of extruded polystyrene under compression stresses. The optimization has been achieved through investigating the relation between the foam microstructure and the global mechanical properties. The foam was first examined using X-ray tomography imaging technique to acquire some morphological information about the microstructure. The obtained morphological data of extruded polystyrene boards were then utilized to develop microstructure-based finite element models based on the socalled idealized realistic Kelvin cell. The finite element simulation was accomplished with the help of the nanoindentation technology to explore the mechanical properties of the cell wall material. The finite element models were validated by comparisons between the simulated and the experimental results. It has been found that the mechanical properties of the foam in different loading directions can be adequately simulated using the approach of the idealized realistic Kelvin cell. With the help of these models, a parameter study was carried out. This study included the effect of cell size and cell anisotropy on the mechanical response of extruded polystyrene boards under compression stresses. Charts relating between the foam microstructure characteristics and the compression behavior were generated based on the parametric study.

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Finite element micromechanics model of impact compression of closed-cell polymer foams

Cited by 76 publications

References 22 publications

Comparing the mechanical performance of synthetic and natural cellular materials

Comparing the mechanical performance of synthetic and natural cellular materials

Dynamic compressive strength and crushing properties of expanded polystyrene foam for different strain rates and different temperatures

Finite element modeling of compression behavior of extruded polystyrene foam using X-ray tomography

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