Damage characterization of three point bended honeycomb sandwich structures under different temperatures with cone beam computed tomography technique

Akatay, Abdullah; Bora, Mustafa Özgür; Fi̇dan, Sinan; Çoban, Onur

doi:10.1002/pc.23900

Cited by 14 publications

(9 citation statements)

References 32 publications

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“…Table 10 shows a comparison between the main properties of the proposed honeycomb panels and an all-aluminium based honeycomb designed for airplane structure (Gillfloor 5424), used the aisle and cargo floors of a Boeing 737-800 aircraft [46]. The proposed bottle caps core with aluminium skins and epoxy polymer exhibits 39% increased absolute flexural properties compared to the panel based on aluminium honeycomb.…”

Section: Comparative Analysismentioning

confidence: 99%

“…The proposed bottle caps core with aluminium skins and epoxy polymer exhibits 39% increased absolute flexural properties compared to the panel based on aluminium honeycomb. Akatay et al [46] reported the absolute properties and the weight per unit area of the panel. Considering the thickness of the panel, an approximate equivalent density of the sandwich panel is determined, from which the specific flexural stiffness can be estimated.…”

Section: Comparative Analysismentioning

confidence: 99%

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Improved sustainable sandwich panels based on bottle caps core

Oliveira

May

Panzera³

et al. 2020

Composites Part B: Engineering

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A sandwich panel based on upcycled bottle caps core and sustainable components is investigated to contribute to advances in lightweight and environmentally friendly structural solutions.Ecological alternatives to the panel skin and adhesive, such as a recycled PET-bottle foil and a castor oil bio-polyurethane, respectively, are tested and compared to commercial components (aluminium skin and epoxy polymer). Bottle caps are characterised using a small punch test specially developed to obtain the properties of the bottle caps. Additionally, low-cost reinforcement (Portland cement) is added to adhesives to enhance the mechanical behaviour of the panel. The sustainable panels achieve enhanced efficiency compared to aluminium-based panels for core shear strength and stiffness, besides having similar specific flexural properties compared to those of epoxy-based PET panels. Despite their higher strength and stiffness, epoxy polymer-based panels show visible adhesive peeling off to bottle caps core and aluminium skin. In contrast, the biopolymer exhibits larger deformation and debonding of both substrates, indicating a progressive and ductile failure. The satisfactory efficiency of sustainable panels confirms the promising reuse of recycled bottle caps in structural applications.

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Section: Comparative Analysismentioning

confidence: 99%

Section: Comparative Analysismentioning

confidence: 99%

Improved sustainable sandwich panels based on bottle caps core

Oliveira

May

Panzera³

et al. 2020

Composites Part B: Engineering

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show abstract

“…The skins are fabricated using unidirectional E‐glass fiber of 220 g/m 2 and reinforced with epoxy L/hardener EPH 161 (MGS Poxy‐systems) using hand layup, while the core is made of an aramid honeycomb (DuPont Nomex). The sandwich design is based on sandwich beam theory, combined with classical laminate theory and composite micromechanics models (see Appendix A1‐A3), which indicate that symmetric and balanced skins will limit the thermal and hygroscopic deformations due to temperature and humidity changes during processing and accelerated lifetime testing (ALT). Skins consisting of four unidirectional GFRP plies in a [0/90] s architecture (total thickness 0.8 mm) are thus combined with a 6 mm thick core to provide a sandwich with a theoretically computed stiffness of 14.96 N·m 2 .…”

Section: Methodsmentioning

confidence: 99%

Light and durable: Composite structures for building‐integrated photovoltaic modules

Martins

Chapuis

Sculati‐Meillaud³

et al. 2018

Progress in Photovoltaics

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In several countries, building‐integrated photovoltaics solutions could prospectively contribute to the growth of total installed photovoltaic (PV) capacity as they enable electricity production with minimal impact on free land. However, in some circumstances, the relatively high weight (≥15 kg/m2) of existing glass/glass building‐integrated photovoltaics modules may constitute a barrier to the diffusion of PV in the built environment. With the aim of limiting the weight while preserving excellent mechanical stability and durability properties, we propose a new design for lightweight crystalline‐silicon (c‐Si) PV modules in which the conventional polymer backsheet (or glass) is replaced by a composite sandwich structure, and the frontsheet by a transparent polymer foil. Since sandwich structures are generally realized using epoxy as a gluing material, requiring long processing times, we further investigate (1) the possibility of using standard polymers used in the solar industry as alternative adhesives in the sandwich and (2) the possibility to considerably simplify manufacturing, using conventional lamination processes. Mini‐modules are produced, characterized, and submitted to accelerated aging tests (thermal cycling and damp‐heat) to assess the stability of the product against environmental degradation. We show that, by using the reference epoxy adhesive, it is possible to manufacture a lightweight (~5 kg/m2) mini‐module in a 2‐step process, which successfully passes a selection of industry qualification tests, including thermal cycling, damp‐heat, and hail test. We further show that, by replacing epoxy by a PV adhesive, we are able to considerably simplify the manufacturing process, while preserving excellent mechanical and durability properties.

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“…In [6][7][8][9][10][11][12][13], the authors present further sandwich structures. The results of diagnostic methods suitable for sandwiches and their components are described in [14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Case Study of Chosen Sandwich-Structured Composite Materials for Means of Transport

et al. 2020

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Modern means of transport increasingly utilize sandwich constructions. Among other things, the reasons for such state of affairs include the reduced weight of means of transport, and through this, better fuel economy as well as price. This work is dedicated to a systematic experimental study of the influence of various materials and sandwich designs on their mechanical properties. In the framework of experiments, sandwich-structured composites were exposed to two types of stressing: static as well as impact stressing. The testing of prepared samples was performed according to ASTM C-393 Standard, dealing specifically with the bending behavior of sandwich composite constructions and impact testing under the scope of ISO 6603-2 Standard test. In this article we deal with static and impact testing of the eight types of core materials, two types of coatings, two types of surface finishes, and two types of resins with a special emphasis on their use in constructions of some exterior or interior components of transport means.

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Damage characterization of three point bended honeycomb sandwich structures under different temperatures with cone beam computed tomography technique

Cited by 14 publications

References 32 publications

Improved sustainable sandwich panels based on bottle caps core

Improved sustainable sandwich panels based on bottle caps core

Light and durable: Composite structures for building‐integrated photovoltaic modules

Case Study of Chosen Sandwich-Structured Composite Materials for Means of Transport

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