Characterization of the compressive deformation behavior with strain rate effect of low-density polymeric foams

Yonezu, Akio; Hirayama, Keita; Kishida, Hiroshi; Chen, Xi

doi:10.1016/j.polymertesting.2015.11.021

Cited by 17 publications

(10 citation statements)

References 19 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: 56%

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: 56%

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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“…By conducting experiments on porous polypropylene (94% porosity) with a closed cell structure (Yonezu et al, 2016) found that the macroscopic stress-strain curve shows the plateau zone when the material undergoes plastic deformation, and that the influence of strain rate is expressed in material behaviour in the plateau zone.…”

Section: Level Of Strain and Strain Ratementioning

confidence: 99%

Factors influencing mechanical properties of polyurethane foams used in compressible flexographic sleeves

Petrović¹,

Design²,

Kašiković³

et al. 2020

Proceedings - The Tenth International Symposium GRID 2020

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Polyurethanes are a group of polymers which are in many ways different from other types of plastic. They are used in many different areas due to the fact that many different chemicals can be used during their synthesis, resulting in a variety of structures. Sleeves are comprised of hard base often covered with compressible polyurethane (PU) foam layer. PU foam layer can have different composition and level of porosity which are the main factors influencing compressibility of the sleeve and therefore its area of use. Sleeves are also one of the least researched components in the flexographic printing process. However, mechanical properties of the polyurethane, its fatigue, lifespan and parameters influencing all of them have been extensively investigated in different areas and for different types and formulations of polyurethane. The aim of this paper is to investigate factors influencing mechanical properties of polyurethane foams used in compressible flexographic sleeves. Investigated parameters are foam density, level of strain and strain rate, influence of microstructure under different conditions and parameters influencing creep and stress relaxation. The review of the existing literature regarding mechanical properties of the PU foams makes it possible to select the parameters with the greatest possible influence on the flexographic printing process, as well as to find the most suitable methods to investigate the effect of exploitation on sleeve properties. As a large number of parameters influencing PU foam mechanical properties are fixed during printing, it can be concluded, through the review of the existing literature, that the main parameters to be investigated are the resilience of the sleeve compressible layer during cyclic compression testing (residual strain), maximum stress, Young’s modulus, hysteresis loss, and creep and stress relaxation during cyclic compression testing with strain retention.

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“…where R per is the permanent deformation ratio, t i is the initial thickness, t r is the recovered thickness, and t c is the compressed thickness. Figure 15(a) shows the detailed concept of equation (1) to clarify this for the reader. In the present study, when the applied load of the universal testing machine to testing sample reaches a certain level of load (equivalent to 7500 N), the whole experiment is terminated.…”

Section: Failure Characteristicsmentioning

confidence: 99%

“…Recently, polyurethane foams (PUFs) have attracted great attention in many industries as important engineering materials owing to many advantageous properties. 1 These foams have a closed cell structure with a high compressive strength, leakage resistance, a low density, low thermal conductivity, and a high strength/ weight ratio. 2 For these reasons, PUFs have been used as coatings, adhesives, thermal insulators, and core materials for sandwich composites.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and cryogenic mechanical properties of CO₂-blown carbon-reinforced polyurethane foam

Kim

Park

et al. 2017

Journal of Cellular Plastics

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In the present study, carbon-nanotube-polyurethane foams were synthesized by adding (0.02, 0.1, and 0.3 wt%) carbon nanotubes during the polymerization reaction between polyol and isocyanate liquids. After the synthesis process, the microstructural cell morphology of the carbon-nanotube-polyurethane foams, based on the amount of carbon nanotubes, was observed using field emission scanning electron microscopy. To evaluate the mechanical characteristics of the carbon-nanotube-polyurethane foams, temperature-dependent (20 C, À90 C, and À163 C) compressive tests were performed, and the results were compared to those of the pure polyurethane foam to verify the effectiveness of the developed carbon-nanotube-polyurethane foams. Specifically, the effects of the weight percent of carbon nanotubes, density, and temperature on the overall behavior of the carbon-nanotube-polyurethane foams were considered. Finally, the permanent deformation ratio and material failure characteristics were investigated. The results showed that the cell morphology and compressive strength of the carbon-nanotube-polyurethane foam with 0.02 wt% carbon nanotubes were superior to those of pure polyurethane foam, and these properties showed a

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Characterization of the compressive deformation behavior with strain rate effect of low-density polymeric foams

Cited by 17 publications

References 19 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

Factors influencing mechanical properties of polyurethane foams used in compressible flexographic sleeves

Synthesis and cryogenic mechanical properties of CO₂-blown carbon-reinforced polyurethane foam

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Characterization of the compressive deformation behavior with strain rate effect of low-density polymeric foams

Cited by 17 publications

References 19 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

Factors influencing mechanical properties of polyurethane foams used in compressible flexographic sleeves

Synthesis and cryogenic mechanical properties of CO2-blown carbon-reinforced polyurethane foam

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Product

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Synthesis and cryogenic mechanical properties of CO₂-blown carbon-reinforced polyurethane foam