Experimental and numerical investigations of the anisotropic deformation behavior of low-density polymeric foams

Fushimi, Shugo; Nagakura, Takumi; Yonezu, Akio

doi:10.1016/j.polymertesting.2017.09.011

Cited by 18 publications

(6 citation statements)

References 14 publications

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“…3). Similarities can be found in mechanical properties ( Table 1) and in the same course of the curve describing the relationship between stress and strain at the compression load [29][30][31][32][33][34].…”

Section: Ceg Elastic Propertiessupporting

confidence: 57%

Adaptation of a highly compressible elastomeric material model to simulate compressed expanded graphite and its application in the optimization of a graphite-metallic structure

Jaszak

2020

J Braz. Soc. Mech. Sci. Eng.

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The paper presents simulations of mechanical properties of compressed expanded graphite. To model the stress and strain states of compressed expanded graphite, a hyperelastic material model formulated by the Blatz-Ko was adapted. The idea of using this model resulted from the assumptions that compressed expanded graphite exhibits similar mechanical properties to polyurethane foam with high density. The material constant of the Blatz-Ko model was determined by numerical calculations where deformation energy equation was parameterized with the shear modulus. Such material model used in a compressed expanded graphite simulation was experimentally validated. Subsequently, the Blatz-Ko model was used in a numerical simulation of the graphite-metallic structure in the form of a spiral wound gasket which is composed of metallic and elastic tapes. This structure was subjected to an optimization process which included the reduction of stress in the elastic graphite tape obtaining the appropriate axial stiffness of the gasket. In the final stage, the optimal design of the gasket was experimentally tested. The experimental results were compared with the data obtained numerically, which allowed to verify the adapted material model and boundary conditions of the numerical gasket model.

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Section: Ceg Elastic Propertiessupporting

confidence: 57%

Adaptation of a highly compressible elastomeric material model to simulate compressed expanded graphite and its application in the optimization of a graphite-metallic structure

Jaszak

2020

J Braz. Soc. Mech. Sci. Eng.

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“…[ 37 ] The anisotropic elastoplastic deformation behavior of polymeric foams in compression was recently quite successful simulated with FEA, based on observed µCT images, which were used to fit an elongated rhombic dodecahedron as model to mimic the 3D structure of the anisotropic foams. [ 38 ]…”

Section: Resultsmentioning

confidence: 99%

Anisotropy Effects in the Shape‐Memory Performance of Polymer Foams

Sauter

Kratz

Madbouly

et al. 2021

Macro Materials & Eng

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Isotropic and anisotropic shape‐memory polymer foams are prepared by supercritical carbon dioxide foaming from a multiblock copolymer (PDLCL) consisting of poly(ω‐pentadecalactone) and poly(ε‐caprolactone) segments. Analysis by micro‐computed tomography reveals for the anisotropic PDLCL foam cells a high shape anisotropy ratio of R = 1.72 ± 0.62 with a corresponding Young's compression moduli ratio between longitudinal and transversal direction of 4.3. The experimental compression data in the linear elastic range can be well described by the anisotropic open foam model of Gibson and Ashby. A micro‐morphological analysis for single pores using scanning electron microscopy images permits the correlation between the macroscopic stress‐compression behavior and microscale structural changes.

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“…1 Basically, there are two modelling approaches 2 : constitutive models [3][4][5][6][7][8] and direct models. [9][10][11][12][13][14][15][16][17] The methods differ in the way the microstructure is described. In the constitutive models the foam microstructure is approximated by a homogeneous medium whereas in the direct models the microstructure is described in detail.…”

Section: Introductionmentioning

confidence: 99%

Development and investigation of the applicability of microstructural models for polymeric low density foams directly obtained from computed tomography data

et al. 2021

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Nowadays, there are several methods to obtain simulation models for foams which consider important microstructural features. This research study presents a method to obtain low density foam models directly from computed tomography (CT) data. Finite element meshes are created from CT measurement results of a polypropylene extrusion foam with two different densities. Sensitivity studies with regard to the tension behaviour are performed with the microstructural models. The study shows that the tension behaviour highly depends on the examined area of the foam because the microstructure and density vary through the foam. Furthermore, the simulation results are validated with experimental results. The validation shows that the tension behaviour of the investigated foams characterised by the simulation approach is in good agreement with the experimentally observed behaviour and that specific microstructural characteristics (e.g. anisotropic cell shapes) are captured in the model.

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Experimental and numerical investigations of the anisotropic deformation behavior of low-density polymeric foams

Cited by 18 publications

References 14 publications

Adaptation of a highly compressible elastomeric material model to simulate compressed expanded graphite and its application in the optimization of a graphite-metallic structure

Adaptation of a highly compressible elastomeric material model to simulate compressed expanded graphite and its application in the optimization of a graphite-metallic structure

Anisotropy Effects in the Shape‐Memory Performance of Polymer Foams

Development and investigation of the applicability of microstructural models for polymeric low density foams directly obtained from computed tomography data

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