Effects of elevated temperature on the shear response of PET and PUR foams used in composite sandwich panels

Garrido, Mário; Correia, João R.; Keller, Thomas

doi:10.1016/j.conbuildmat.2014.11.053

Cited by 66 publications

(39 citation statements)

References 19 publications

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“…Therefore, we can ignore the inertial force generated by the intermediate deflection, using sandwich panel theory, therefore, the basic equation can be derived based on the relationship between shear, load and momentum. 21,22 We deduce inherent vibration equations and modeling process based on ANSYS of the sandwich panel based on the geometry in Fig. 1.…”

Section: Resultsmentioning

confidence: 99%

Nonlinear vibration of Al-Al based high entropy alloy circular sandwich panel

et al. 2019

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Circular sandwich panels were designed with Aluminium being core material, steel and Al-Al-based high entropy alloy (Al-based HEA) as the surface board materials, respectively. The dynamic response and influence of small changes in thickness and inherent properties (poisson ratio and density) of the sandwich panels are investigated by a three-dimensional finite element modeling. The nonlinear vibration of the sandwich panel changes from steady state to multiple-periods-bifurcation and chaotic vibration state by changing the forced excitation frequency, amplitude and the initial conditions. Compared with Al-steel sandwich panel, Al-based HEA sandwich panel has good stability under high excitation frequency. Our research shows that Al-Al HEA has potential advantages to be a aircraft and aerospace sandwich panel candidate.

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Section: Resultsmentioning

confidence: 99%

Nonlinear vibration of Al-Al based high entropy alloy circular sandwich panel

et al. 2019

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“…Pau et al studied the thermal decompositions of both non‐fire‐retardant and fire‐retardant foams using thermogravimetric (TG) experiments and determined their kinetic triplets (pre‐exponential factor, activation energy and reaction order) based on the mass loss histories in TG using graphical techniques. Garrido et al studied the shear response of polyurethane foam under elevated temperature using dynamic mechanical analyses (DMA) and TG. The experiments showed that shear moduli of polyurethane foam considerably reduced as the temperature increased.…”

Section: Introductionmentioning

confidence: 99%

“…Garrido et al studied the shear response of polyurethane foam under elevated temperature using dynamic mechanical analyses (DMA) and TG. The experiments showed that shear moduli of polyurethane foam considerably reduced as the temperature increased.…”

Section: Introductionmentioning

confidence: 99%

“…Garrido et al [5] studied the shear response of polyurethane foam under elevated temperature using dynamic mechanical analyses (DMA) and TG. The experiments [5] showed that shear moduli of polyurethane foam considerably reduced as the temperature increased.When the polyurethane foam reaches the decomposition temperature, it decomposes into melt and gas through the first sub-reaction. From the TG results, by the end of the first sub-reaction, the remaining melt is approximately 70% of the original sample mass [4].…”

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confidence: 98%

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Pyrolysis of polyurethane foam: optimized search for kinetic properties via simultaneous K–K method, genetic algorithm and elemental analysis

Pau²,

Zhang

2015

Fire and Materials

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SUMMARYThis study focuses on the determination of kinetic properties for non-fire retardant (NFR) and fire retardant (FR) polyurethane foams. Based on the experimental thermogravimetric (TG) curves, this paper describes the application of an in-depth mathematical analysis and genetic algorithm (GA) to produce the kinetic properties. A recent developed technique, K-K method, is used for calculating kinetic properties and determining the search regions of these properties for GA. Elemental analysis is also used to study the pyrolysis mechanism. Three decomposition models were investigated for comparison, and the results show that the decomposition model with three sub-reactions achieves the closest representation with experimental results. In the model, two sub-reactions capture the foam and melt decompositions, and another sub-reaction with relatively lower activation energy captures the early onset of foam decomposition. The kinetic properties of melt decomposition are found similar because of the similarity of melt chemical formulas and decomposition of NFR and FR foams. The kinetic properties of foam decomposition between NFR and FR foams are different because of the mechanism of FR additives. Validation of the successive and parallel reaction schemes shows no noticeable difference between the two schemes in the modelling decomposition.

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“…The connection of all parts can be ensured by adhesive layer that is available in form of foil adhesive or liquid type, applied by hand lay-up. The most commonly used adhesives are epoxides, polyesters or polyurethanes [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

On Flexural Stiffness of Polymer Sandwich Walls

Šuba

Fojtl

Sýkorová

et al. 2016

MSF

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Abstract. This paper deals with the flexural stiffness of sandwich structures based on fiberglass and polymeric foams. The influence of geometrical and material parameters on the resulting effective flexural stiffness of the sandwich structure is being studied experimentally, analytically and using FEM models. The effective elasticity module of the sandwich-structured element is being studied and it's theoretical and model dependencies on the stiffness of the foam core are being investigated. These dependencies are then compared with experimentally observed values. This study shows it is necessary to pay special attention to the issue of flexural stiffness of walls when designing sandwich shell products in order to prevent possible failures in the practical applications of these types of structures.

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Effects of elevated temperature on the shear response of PET and PUR foams used in composite sandwich panels

Cited by 66 publications

References 19 publications

Nonlinear vibration of Al-Al based high entropy alloy circular sandwich panel

Nonlinear vibration of Al-Al based high entropy alloy circular sandwich panel

Pyrolysis of polyurethane foam: optimized search for kinetic properties via simultaneous K–K method, genetic algorithm and elemental analysis

On Flexural Stiffness of Polymer Sandwich Walls

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