Fatigue of Closed Cell Foams

Zenkert, Dan; Shipsha, Andrey; Burman, Magnus

doi:10.1177/1099636206065886

Cited by 44 publications

(61 citation statements)

References 15 publications

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“…Rohacell foams include 51WF and 110WF with nominal densities of 52 and 110 kg/m 3 , respectively (Rohacell, 2008), which are PMI (polymethacrylimide) closed-cell rigid foams. Mechanical properties of Rohacell WF have been extensively studied (Li and Mines, 2002;Li et al, 2006Li et al, , 2000Flores-Johnson et al, 2008;Zenkert et al, 2006;Zenkert and Burman, 2009). In addition to Rohacell WF foams, two PEI (polyetherimide) closed-cell thermoplastic foams, Airex R82.60 and R82.80 with nominal densities of 60 and 80 kg/m 3 , respectively (Airex, 2009), are also investigated.…”

Section: Materials Propertiesmentioning

confidence: 99%

Indentation into polymeric foams

Flores‐Johnson

2010

International Journal of Solids and Structures

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a b s t r a c tThe effects of the nose shape of rigid indenters on the indentation behaviour of polymethacrylimide (PMI) and polyetherimide (PEI) foams with different densities are investigated. Experimental results show that indentation resistance depends on the geometry of the indenter and the density of the foam. Analytical models based on the deformation mechanisms observed in experiments are developed to predict the indentation resistance. It shows that the analytical predictions are in good agreement with experimental measurements for a range of polymeric foams. This study presents a complete and systematic experimental data on the indentation behaviours of a range of polymeric foams and demonstrates the capability of the analytical model to predict the indentation behaviours of PMI and PEI foams.

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Section: Materials Propertiesmentioning

confidence: 99%

Indentation into polymeric foams

Flores‐Johnson

2010

International Journal of Solids and Structures

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“…The response of these foams is well understood at low strain rates. Zenkert et al [11,12] investigated the macroscopic quasistatic response of Rohacell foams by conducting compression, tension and shear experiments. Other authors have focused on the material response at microscopic length-scales, performing in-situ compression and tension experiments in electron microscopes and deducing the effects of different micro-mechanical mechanisms upon the macroscopic elasto-plastic foam response, as well as the sensitivity of this response to the geometrical features of the microstructure [13].…”

Section: Introductionmentioning

confidence: 99%

Compressive deformation of Rohacell foams: Effects of strain rate and temperature

Arezoo

Tagarielli

Siviour

et al. 2013

International Journal of Impact Engineering

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Uniaxial compression experiments have been performed on four different densities of Rohacell foam. The experiments explored the sensitivity of the response to the imposed strain rate (in the range 10 -3 -5x10 3 s -1 ) and temperature (203 -473 K). The compressive collapse stress is generally found to increase with increasing strain rate and decreasing temperature; however this tendency is inverted at very low temperatures or very high strain rates. This behaviour is mainly due to embrittlement of the parent polymer but is also related to the details of the foams' microstructures. Timetemperature superposition is employed to map the temperature sensitivity of the foams to their strain rate dependence. A simple design formula is provided to predict the foam stiffness as a function of temperature and relative density.

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“…As mentioned before, several models have been proposed for estimation of the Young's modulus of the foam in terms of its density and properties of the bulk material [3][4][5]12]. Gibson and Ashby assumed a cubic array of cells and by analyzing the bending and stretching of the cell walls proposed the following semi-empirical relation for a closedcell foam [3] where E is the Young's modulus of the foam, ρ the density, C 1 and C 2 are constants, and ϕ is material fraction in the edges of the cell usually varying between 0.6 and 0.8.…”

Section: Modeling Of Young's Modulusmentioning

confidence: 99%

“…Additional quasi-static characterization studies including yield and failure criteria have been discussed by Fiedler et al [8], Abrate [9], and FloresJohnson and Li [10]. Kanny et al [11] and Zenkert et al [12] characterized polymeric foams under static and cyclic loading and studied the failure mechanisms.…”

Section: Introductionmentioning

confidence: 97%

“…Polymeric foams are usually made of polyvinyl chloride (PVC), polyurethane (PUR) or polystyrene. The mechanical behavior of cellular foams has been investigated and discussed extensively in the literature over the last two decades [3][4][5][6][7][8][9][10][11][12][13][14][15]. In most cases the emphasis is on the energy absorption characteristics of foams undergoing large dynamic deformations.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Anisotropic Polymeric Foam Under Static and Dynamic Loading

Daniel

Cho

2011

Exp Mech

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An orthotropic polymeric foam with transverse isotropy (Divinycell H250) used in composite sandwich structures was characterized at various strain rates. Uniaxial experiments were conducted along principal material axes as well as along off-axis directions under tension, compression, and shear to determine engineering constants, such as Young's and shear moduli. Uniaxial strain experiments were conducted to determine mathematical stiffness constants, i. e., C ij . An optimum specimen aspect ratio for these tests was selected by means of finite element analysis. Quasi-static and intermediate strain rate tests were conducted in a servo-hydraulic testing machine. High strain rate tests were conducted using a split Hopkinson Pressure Bar system built for the purpose using polymeric (polycarbonate) bars. The polycarbonate material has an impedance that is closer to that of foam than metals and results in lower noise to signal ratios and longer loading pulses. It was determined by analysis and verified experimentally that the loading pulses applied, propagated along the polycarbonate rods at nearly constant phase velocity with very low attenuation and dispersion. Material properties of the foam were obtained at three strain rates, quasi-static (10 −4 s −1 ), intermediate (1 s −1 ), and high (10 3 s −1 ) strain rates. A simple model proposed for the Young's modulus of the foam was in very good agreement with the present and published experimental results.

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Fatigue of Closed Cell Foams

Abstract: This is the accepted version of a paper published in Journal of Sandwich Structures and Materials. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.

Cited by 44 publications

References 15 publications

Indentation into polymeric foams

Indentation into polymeric foams

Compressive deformation of Rohacell foams: Effects of strain rate and temperature

Characterization of Anisotropic Polymeric Foam Under Static and Dynamic Loading

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