In-plane effective shear modulus of generalized circular honeycomb structures and bundled tubes in a diamond array structure

Silva

Journal of Composite Materials

et al. 2020

This work describes the use of transverse reinforcement in eco-friendly sandwich panels made from aluminium skins and a core of upcycled bottle caps. The Design of Experiments technique identifies the effect of the position of the metal rivets on the panel. The results show a moderate increase in strength and a significant enhancement of the sandwich panel stiffness when the rivets are placed on the upper skin, with a remarkable improvement in terms of the core shear modulus. The use of metal rivets has also increased the specific mechanical strength and stiffness of the panels, which highlights the effectiveness of the transverse reinforcement in bottle caps panels.

Section: Introductionmentioning

confidence: 99%

Transverse fastening reinforcement of sandwich panels with upcycled bottle caps core

Silva

Journal of Composite Materials

et al. 2020

“…One of the most recently developed core topologies is the circular cell honeycomb, also called the tubular honeycomb (TH). THs have been used for different applications, ranging from supporting oil transport infrastructure in on and offshore facilities, to energy absorbing sandwich plates [4]. A significant body of research [4][5][6][7][8][9] has shown the advantages of using tubular honeycombs to enhance the mechanical performance of sandwich panels.…”

Section: Introductionmentioning

confidence: 99%

“…THs have been used for different applications, ranging from supporting oil transport infrastructure in on and offshore facilities, to energy absorbing sandwich plates [4]. A significant body of research [4][5][6][7][8][9] has shown the advantages of using tubular honeycombs to enhance the mechanical performance of sandwich panels. Oruganti and Ghosh [5] have shown the intrinsic stiffness and strength enhancement of TH structures due to the geometrical constraints associated with the deformation of cylinders.…”

Section: Introductionmentioning

confidence: 99%

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Sustainable sandwich composite structures made from aluminium sheets and disposed bottle caps

Bonaccorsi

et al. 2017

Thin-Walled Structures

This work describes the development of a sustainable and low-cost sandwich composite structure made from aluminium skins and bonded to a tubular core with epoxy resin. The core is made from disposed plastic bottle caps. An analysis of variance (ANOVA) has been performed to determine the significance of the orientation of the bottle caps in the core, the use and type of adhesive over the bulk density and the mechanical properties of the sandwich panels. The results show that a core topology made from an alternated orientation of the bottle caps provides an enhancement of the resistance in the face skins and the core. The use of the epoxy adhesive between adjacent bottle caps also gives an increase of the maximum resistance of the panel.

“…Circular cell honeycombs are worthy of a particular mention. These core structures, discussed in technical open literature since the 1960s [1] and investigated at length by Chung and Waas [6], can be used in a variety of applications, such as oil transport in on-and off-shore facilities, and structural applications in sandwich plates [7].…”

Section: Introductionmentioning

confidence: 99%

Sustainable sandwich structures made from bottle caps core and aluminium skins: A statistical approach

Freire

et al. 2018

Thin-Walled Structures

This work further investigates the manufacture and characterisation of a sustainable sandwich panel made from aluminium skins and a recycled thermoplastic bottle cap core, an innovative concept proposed in a previous paper. A full factorial design based on Design of Experiments (DoE) and Analysis of Variance (ANOVA) techniques has highlighted the complex influence of three manufacturing parameters (type of polymeric adhesive, adhesive layer thickness layer and core packing topology) on the absolute and specific physical and flexural properties of the panels. The ANOVA revealed that the use of higher amount of epoxy polymer led to enhanced panel strength and stiffness. The cell packing topology, however, did not provide a significant effect on most panel properties. Discarded bottle caps have proven to be a promising lightweight and inexpensive honeycomb component for structural applications.