Mechanical properties of high density polyurethane foams: I. Effect of the density

Saint-Michel, Fabrice; Chazeau, Laurent; Cavaillé, J.Y.; Chabert, Emmanuelle

doi:10.1016/j.compscitech.2006.03.009

Cited by 192 publications

(112 citation statements)

References 19 publications

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“…Table 2 shows real cell size distributions of PU foams with q r between 0.51 and 0.85 [12]. Corresponding compres- Finite element models predict correctly the elastic region of compression curves of the foams with three different q r .…”

Section: Validation Of Geometric Rsa Modelsmentioning

confidence: 90%

“…6. Comparison of experimentally obtained stress-strain compression curves of PU foams (solid curves) [12] and the modelling results obtained in this work by equivalent FEM RSA models using C3D4 elements (dashed and dotted curves). Abb.…”

Section: Impact Of Relative Density (Q R ) and Cell Size (D Cell )mentioning

confidence: 93%

“…6. Vergleich von experimentell ermittelten Spannungs-Dehnungs-Kurven von PU Schäumen (durchgezogene Linien) [12] und Ergebnisse der Modellierung mittels äquivalenter FEM RSA Ansätze unter Verwendung von C3D4 Elementen (gestrichelte und gepunktete Kurven). range from 0.15 to 1.…”

Section: Impact Of Relative Density (Q R ) and Cell Size (D Cell )unclassified

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Finite element modelling of compressive mechanical behaviour of high and low density polymeric foams

Álvarez¹,

Mendizabal²,

Petite³

et al. 2009

Materialwissenschaft Werkst

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In this work, different methodologies were studied by means of finite element modelling (FEM) with the aim of predicting the mechanical behaviour of high and low relative density (q r ) polymeric foams. Virtual structures which resemble the real ones were created by various computer-based tools. These tools were employed to make up both "unit cells" and random structural units so-called "Representative Volume Elements" (RVE). Low q r foams are usually modelled as regular (tetrakaidecahedron) and irregular (Voronoi tessellations) 3D structures made of structural elements (beams and shells). These types of finite elements are only applicable if the ratio between longitudinal and axial dimensions exceeds a certain value and therefore, there is a practical relative density limit above which these elements are not suitable. Alternatively, virtual low q r foams were created by means of cellular automata which allow a close control of bubble growth and final cell character and do not show the previous limitation. Additionally, virtual high q r structures (q r > 0.5) consisting of isolated bubbles or cells were created by random incorporation of cell sets whose size distributions adjust to experimentally measured ones. A random sequential adsorption algorithm (RSA) which accurately controls final thickness of ligaments between cells was programmed for this purpose. FEM results of this kind of virtual foams are compared with experimentally tested mechanical properties. Moreover, impact of structural parameters (mean cell size) on elastic modulus and compressive collapse stress is critically assessed.

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Section: Validation Of Geometric Rsa Modelsmentioning

confidence: 90%

Section: Impact Of Relative Density (Q R ) and Cell Size (D Cell )mentioning

confidence: 93%

See 1 more Smart Citation

Finite element modelling of compressive mechanical behaviour of high and low density polymeric foams

Álvarez¹,

Mendizabal²,

Petite³

et al. 2009

Materialwissenschaft Werkst

View full text Add to dashboard Cite

show abstract

“…Zaretsky et al studied the impact response of high density flexible polyurethane foams [8]. Saint-Michael et al studied the mechanical properties of high density polyurethane foams [9]. Numerous other researchers worked on the mechanical properties of low density foams [10,11].…”

Section: Introductionmentioning

confidence: 98%

Visco-hyperelastic constitutive model for modeling the quasi-static behavior of polyurethane foam in large deformation

Jmal

Dupuis

et al. 2014

Polym Eng Sci

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Flexible polyurethane foam is widely used in numerous applications such as seats and mattresses, due to its low stiffness and its ability to absorb deformation energy. The main objective of this article is to model the quasi-static mechanical behavior of three types of polyurethane foam in large deformation and to compare these three foams with three proposed models. The uniaxial compression/ decompression tests at three different strain rates were performed. The test results show that the three foams present different plateau stresses, maximum stresses, and abilities to absorb energy. Moreover, polyurethane foam also presents a nonlinear hyperelastic behavior and a viscoelastic behavior in large deformation. Three viscohyperelastic models which include a hyperelastic component and a memory component are proposed to model these behaviors. Model parameters were identified using the experimental data and a proper identification method. These models were validated on these three types of foam with the aim to present comparison results. The comparison results show that Ogden's viscoelastic model best agrees with the experimental results. POLYM. ENG. SCI., 55:1795SCI., 55: -1804SCI., 55: , 2015

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“…The foam density has an influence on the foam microstructure and accordingly on the properties of the foam [6,7]. The performance of foams has thus to be studied as a function of several parameters such as density, microstructure and also the strain rate imposed during dynamic loading.…”

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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Mechanical properties of high density polyurethane foams: I. Effect of the density

Cited by 192 publications

References 19 publications

Finite element modelling of compressive mechanical behaviour of high and low density polymeric foams

Finite element modelling of compressive mechanical behaviour of high and low density polymeric foams

Visco-hyperelastic constitutive model for modeling the quasi-static behavior of polyurethane foam in large deformation

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

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