Sound insulation performance of honeycomb core aluminum sandwich panels with flexible epoxy-based foam infill

Boztoprak, Yalçın; Ünal, Merve; Özada, Çağatay; Kuzu, Eslem; Özer, Hakkı; Ergin, Furkan; Yazıcı, Murat

doi:10.1016/j.compstruct.2023.117149

Cited by 12 publications

(1 citation statement)

References 40 publications

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“…They have the advantages of high porosity, low density, excellent specific stiffness and specific strength, extraordinary energy absorption capacity [2][3][4][5]. Therefore, the honeycomb structures have been applied for resisting impact and absorbing energy in various engineering fields, such as aerospace, medical, automotive, construction, acoustics, etc [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of manufacturing process parameters on the compression and energy absorption properties of 4D-printed deformable honeycomb structure

Peng,

Han,

Liu

et al. 2024

Smart Mater. Struct.

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Four-dimensional-printed deformable honeycombs can produce pro-programmed shape deformation and different properties under external stimuli, and the manufacturing process parameters are the dominant factors affecting the microstructure and properties of the manufactured honeycomb structures. Although many researchers have investigated the effects of manufacturing process parameters on the mechanical properties of printed materials, there is still a lack of research on the relationship between manufacturing process parameters and properties of honeycomb structures. Therefore, a novel honeycomb structures which has two configurations under temperature stimuli is proposed, and the optimum manufacturing processes for the printing of this honeycomb are selected considering the compression and energy absorption properties simultaneously. The novel honeycomb is designed and printed with fused deposition modeling technology, which have hexagonal configuration (Structure I) and semi-triangular configuration (Structure II) under external temperature stimulus. The energy absorption capacity of Structure I and compressive properties of Structure II are investigated under different manufacturing process parameters. The experimental results indicate that the layer thickness has the most significant impact on the mechanical performance of deformable honeycombs. The combination of a layer thickness of 0.2 mm, printing speed of 40 mm s−1, and 100% infill density are the best process parameters for the novel deformable honeycomb structures.

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Section: Introductionmentioning

confidence: 99%

Effect of manufacturing process parameters on the compression and energy absorption properties of 4D-printed deformable honeycomb structure

Peng,

Han,

Liu

et al. 2024

Smart Mater. Struct.

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Preparation of thermal expandable epoxy resin and properties of foam sandwich composites formed by thermal expansion molding process

Qin,

Mei,

Kang

et al. 2024

Polymer Composites

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Thermal expansion molding process (TEMP) is a sophisticated molding technique for creating complex sandwich composites. The core key of TEMP is a high‐performance, thermally expandable resin film. In this study, the epoxy resin is used to create a specific crosslinking network that can provide the support force required for the stable molding of the vesicles during the expansion process of the foaming agent. The curing process of the resin was determined by analyzing the change in the exothermic amount of the epoxy resin during the curing process and the flow behavior of the resin. The pore size distribution of the epoxy foam was investigated, and the expansion force of the thermally expandable resin was tested. The TEMP molding process was compared with the vacuum bag press molding (VBPM) process. The TEMP molding technique increased tensile and compressive strength by about 25%, flexural strength by 34.5%, and shear strength by 54.5%. Finally, the section on microanalysis of the comparative materials and the short beam bending experiments of the sandwich structure provides a theoretical foundation for developing complicated sandwich structures.Highlights Preparation of thermally expandable epoxy prepregs with stabilized foaming by means of pre‐curing. The effects of curing temperature, foaming agent content and expansion multiplicity on the thermal expansion force of epoxy prepreg adhesives were investigated. Thermally expandable epoxy prepreg molding composites with different expansion multiplicities and analysis of the mechanical properties of the composites. Preparation of foam core sandwich composites by thermal expansion in‐mold monolithic molding process and their verification by bending experiments.

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The effect of the viscoelastic support and GRPL-reinforced foam material on the thermomechanical vibration response of piezomagnetic sandwich nanosensor plates

Eroğlu,

Esen,

Koç

2024

Acta Mech

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This paper investigates the vibration characteristics of a sandwich nanosensor plate composed of piezoelectric materials, specifically barium and cobalt, in the upper and lower layers, and a core material consisting of either ceramic (silicon nitride) or metal (stainless steel) foams reinforced with graphene (GPRL). The study utilized the novel sinosoidal higher-order deformation theory and nonlocal strain gradient elasticity theory. The equations of motion for nanosensor sandwich graphene were derived using Hamilton's principle, considering the thermal, electroelastic, and magnetostrictive characteristics of the piezomagnetic surface plates. These equations were then solved using the Navier method. The core element of the sandwich nanosensor plate can be represented using three distinct foam variants: a uniform foam model, as well as two symmetric foam models. The investigation focused on analyzing the dimensionless fundamental natural frequencies of the sandwich nanosensor plate. This analysis considered the influence of three distinct foam types, the volumetric graphene ratio, temperature variation, nonlocal parameters, porosity ratio, electric and magnetic potential, as well as spring and shear viscoelastic support. Furthermore, an analysis was conducted on the impact of the metal and ceramic composition of the central section of the sandwich nanosensor plate on its dimensionless fundamental natural frequencies. In this context, the use of ceramic as the central material results in a mean enhancement of 33% in the fundamental natural frequencies. In contrast, the incorporation of graphene into the core material results in an average enhancement of 27%. The thermomechanical vibration behavior of the nanosensor plate reveals that the presence of graphene-supported foam and a viscoelastic support structure in the core layer leads to an increase in thermal resistance. This increase is dependent on factors such as the ratio of graphene, porosity ratio of the foam, and parameters of the viscoelastic support. Metal foam or ceramic foam has been found to enhance thermal resistance when compared to solid metal or ceramic core materials. The analysis results showed that it is important to take into account the temperature-dependent thermal properties of barium and cobalt, which are piezo-electromagnetic materials, and the core layer materials ceramics and metal, as well as the graphene used to strengthen the core. The research is anticipated to generate valuable findings regarding the advancement and utilization of nanosensors, transducers, and nano-electromechanical systems engineered for operation in high-temperature environments.

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Sound insulation performance of honeycomb core aluminum sandwich panels with flexible epoxy-based foam infill

Cited by 12 publications

References 40 publications

Effect of manufacturing process parameters on the compression and energy absorption properties of 4D-printed deformable honeycomb structure

Effect of manufacturing process parameters on the compression and energy absorption properties of 4D-printed deformable honeycomb structure

Preparation of thermal expandable epoxy resin and properties of foam sandwich composites formed by thermal expansion molding process

The effect of the viscoelastic support and GRPL-reinforced foam material on the thermomechanical vibration response of piezomagnetic sandwich nanosensor plates

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