Polyurethane Foam Physical Properties as a Function of Foam Density

Kreter, P.E.

doi:10.1177/0021955x8502100502

Cited by 11 publications

(4 citation statements)

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“…The modulus of elasticity increases rapidly in foam samples with higher densities, and the stresses measured at 5% and 70% of the strain increase in parallel with the density (Alzoubi et al, 2014). It has been experimentally proven that hysteresis (Kreter, 1985;Lee, 1985;Cavender, 1990) and reduction of stress due to fatigue (Dwyer, 1976;Courtney et al, 1989) decrease with increasing foam density. These conclusions are supported by the observations of the author (Dwyer, 1976) who showed that with flexible polyurethane foams, density reduction is not the main reason for increased fatigue (i.e.…”

Section: Graph 1: Stress-strain Curves Of Jc Foams With Different Denmentioning

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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Section: Graph 1: Stress-strain Curves Of Jc Foams With Different Denmentioning

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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show abstract

“…The diameter of the ABS tube is 3 mm and the linear density of polyester filaments is 1670 dtex (456f). The density of pure foam is 0.10 g/cm 3 , while the auxetic composite and non-auxetic composite have the same density of 0.27 g/cm 3 . The dimension of the samples is 100 mm (length) × 98 mm (depth) × 28 mm (thickness).…”

Section: Samplesmentioning

confidence: 99%

“…However, easy deformation, plastic collapse and fracture can easily cause fatigue even failure of the polymeric foams. To increase the mechanical properties of polymeric foams, parameters such as polymer type, foam density, open/closed cell content, cell size and cell shape are usually adjusted [2,3]. Another approach is to fill chopped fibers [4] or nano-sized particles [5] into foams to increase their stiffness and plateau stress.…”

Section: Introductionmentioning

confidence: 99%

Low-velocity impact response of multilayer orthogonal structural composite with auxetic effect

Jiang

2017

Composite Structures

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“…Since the first auxetic polyurethane (PU) foam with a re-entrant structure was made by Lakes in 1987, a number of auxetic materials have been proposed and fabricated, ranging from macroscopic and micro-structural levels to a molecular level, including auxetic polymeric foams and micro-porous polymers [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ], auxetic fibers [ 8 , 9 ] and fabrics [ 10 , 11 , 12 , 13 ], auxetic honeycombs [ 14 ] and composites [ 15 , 16 , 17 , 18 ], and so on. Auxetic materials have aroused much interest due to their counterintuitive deformation behavior and improved mechanical properties, such as enhanced shear resistance [ 19 , 20 , 21 ], increased indentation resistance [ 22 , 23 , 24 , 25 ], and improved crashworthiness [ 26 , 27 ]. These feature advantages have made auxetic materials very attractive for many potential applications such as automobile, aerospace and defense, and sport equipments, etc.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling of Multilayer Orthogonal Auxetic Composites under Low-Velocity Impact

Jiang

2017

Materials

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The multilayer orthogonal auxetic composites have been previously developed and tested to prove that they own excellent energy absorption and impact protection characteristics in a specific strain range under low-velocity impact. In this study, a three dimensional finite element (FE) model in ANSYS LS-DYNA was established to simulate the mechanical behavior of auxetic composites under low-velocity drop-weight impact. The simulation results including the Poisson’s ratio versus compressive strain curves and the contact stress versus compressive strain curves were compared with those in the experiments. The clear deformation pictures of the FE models have provided a simple and effective way for investigating the damage mechanism and optimizing the material, as well as structure design.

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Polyurethane Foam Physical Properties as a Function of Foam Density

Cited by 11 publications

References 0 publications

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

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

Low-velocity impact response of multilayer orthogonal structural composite with auxetic effect

Finite Element Modeling of Multilayer Orthogonal Auxetic Composites under Low-Velocity Impact

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