Fiber Element Model of Sandwich Panels with Soft Cores and Composite Skins in Bending Considering Large Shear Deformations and Localized Skin Wrinkling

Fam, Amir; Sharaf, Tarek; Sadeghian, Pedram

doi:10.1061/(asce)em.1943-7889.0001062

Cited by 18 publications

(9 citation statements)

References 13 publications

(13 reference statements)

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“…A great deal of research in previous years has focused on the flexural performance of PUF sandwich composites under bending loads. Researchers have used different numerical, analytical and experimental techniques to analyze the flexural behavior of PUF sandwich composites and have focused on different parameters and their effects on their flexural performance . One of the most important parameters is the density of the PUF core, which has a great influence on the flexural behavior of sandwich composites.…”

Section: Puf Core Sandwich Structuresmentioning

confidence: 99%

A review on recent advances in sandwich structures based on polyurethane foam cores

et al. 2020

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Sandwich composites with a polyurethane foam (PUF) core have become a versatile set of materials with applications ranging from basic construction elements to advanced engineering materials. This diverse range of applications has provided these sandwich materials with a distinctive position in today's engineering world. This review focuses on the broad research that has been carried out on PUF core‐based sandwich composites over the years—especially in the last decade. Thorough details have been presented focusing on basic PUF core sandwich structures, advanced PUF core sandwich composites with different kinds of reinforcements and complex structures such as hybrid sandwich panels. All the research presented here has been categorized carefully, such as the types of materials used in various studies, the types of reinforcements and testing techniques used, including mechanical, electrical, dynamic, thermal and acoustic methods etc. Comparisons have also been made based on similar materials, similar testing procedures and similar application areas. Research areas have been highlighted by giving a deep insight into the most promising research, manufacturing techniques and improvement procedures. Major consumption areas and application sectors for PUF core sandwich composites have also been discussed in this review. Finally, conclusions have been made based on the results found from a literature investigation.

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Section: Puf Core Sandwich Structuresmentioning

confidence: 99%

A review on recent advances in sandwich structures based on polyurethane foam cores

et al. 2020

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“…Some of the earliest applications of sandwich structures in the 20th century were in aircraft industry [2]. This was followed by expansion into the aerospace, automotive, and marine industries [3]. In civil engineering, there are many applications such as cladding, decking, and roofing panels that can benefit greatly from sandwich structures.…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical behavior of sandwich composite beams: Comparison of natural and synthetic materials

Sadeghian

Hristozov

Wroblewski

2016

Jnl of Sandwich Structures & Materials

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In this study, the flexural behavior of sandwich composite beams made of fiber-reinforced polymer (FRP) skins and light-weight cores are studied. The focus is on the comparison of natural and synthetic fiber and core materials. Two types of fiber materials, namely glass and flax fibers, as well as two types of core materials, namely polypropylene honeycomb and cork, are considered. A total of 105 small-scale sandwich beam specimens (50 mm wide) were prepared and tested under four-point bending. Test parameters were fiber types (flax and glass fibers), core materials (cork ad honeycomb), skin layers (0, 1, and 2 layers), core thicknesses (6–25 mm), and beam spans (150 and 300 mm). The load–deflection behavior, peak load, initial stiffness, and failure mode of the specimens are evaluated. Moreover, the flexural stiffness, shear rigidity, and core shear modulus of the sandwich composites are computed based on the test results of the two spans. An analytical model is also implemented to compute the flexural stiffness, core shear strength, and skin normal stress of the sandwich composites. Overall, the natural fiber and cork materials showed a promising and comparable structural performance with their synthetic counterparts.

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“…A common choice for facing materials are fiber-reinforced polymers (FRPs) because of their high specific strength. Because failure of sandwich panels is often initiated in the weaker core material [2,3], there is an option to use lower strength, yet environmentally friendly facing materials, such as FRPs made with renewable constituents, such as flax fibers and bio-based resins.…”

Section: Introductionmentioning

confidence: 99%

“…Sandwich panels constructed with synthetic faces and foam cores have been studied under impact loading [4][5][6]. Panels constructed with FFRP faces have been studied in flexural applications [2,3,7,8] and axial loading applications [9]. However, there is a gap in the available research which is the behavior of sandwich panels with FFRP faces under impact loading.…”

Section: Introductionmentioning

confidence: 99%

Cumulative Impact Energy Absorption of Sandwich Panels with Foam Cores and Flax FRP Facings

Betts¹,

Sadeghian²,

Fam³

2018

Materials Research Proceedings

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In this paper, the cumulative energy absorption of sandwich panels constructed of foam cores and flax fiber-reinforced bio-based polymer (FFRP) faces is studied. Nine sandwich panels were constructed and tested under varying amounts of impact energy using a drop weight test. The parameters of the study were facing thickness and foam core density. Three different facing thicknesses (one, two, and three layers of a bidirectional flax fabric with a nominal unit weight of 400 kg/m 2 ) and three different core densities (32 kg/m 3 , 64 kg/m 3 , and 96 kg/m 3 ) were used. An accelerometer was placed on the bottom face of each specimen and on the drop weight. The data from the accelerometers is used to determine each specimen's fundamental frequency after each impact to determine the amount of damage in the specimen. To calculate curvature, strain gauges were placed at the center of the top and bottom face at mid-span. The information obtained is used to determine the ability of these panels to absorb the energy from multiple impact events. It also helps to establish a fundamental understanding of the behavior of the panels under impact for future research. To date all specimens have been fabricated and one of the specimens has been tested. Based on the results, the specimen was not visibly damaged after impact events of up to 122 N-m, but it failed at an impact energy of 153 N-m. The specimen deflection and facing strains increased with impact energy.

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Fiber Element Model of Sandwich Panels with Soft Cores and Composite Skins in Bending Considering Large Shear Deformations and Localized Skin Wrinkling

Cited by 18 publications

References 13 publications

A review on recent advances in sandwich structures based on polyurethane foam cores

A review on recent advances in sandwich structures based on polyurethane foam cores

Experimental and analytical behavior of sandwich composite beams: Comparison of natural and synthetic materials

Cumulative Impact Energy Absorption of Sandwich Panels with Foam Cores and Flax FRP Facings

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