Mathematical models and experimental data for HDF based sandwich panels with dual corrugated lightweight core

Smardzewski, Jerzy; Jasińska, Dorota

doi:10.1515/hf-2016-0146

Cited by 20 publications

(19 citation statements)

References 32 publications

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“…Cellular honeycombs have a wide range of implementation from furniture manufacture to the door industry [17]. Attempts have also been made to find a replacement for the conventional paper core with a corrugated core made out of wood fibres [18,19], plywood, or HDF [20]. Few milestones were achieved in the field of modelling lattice, pyramidal, or auxetic from wood-based composites.…”

Section: Introductionmentioning

confidence: 99%

“…The type of biomaterial facing significantly affects the ability to absorb and dissipate energy during bending of multilayered beams with an auxetic core. A negative Poisson's ratio characterized auxetic materials (structures) [8,9,[12][13][14][15][16]18]. They improve the mechanical properties of panels, beams, etc., especially shear resistance, bending resistance, impact resistance, and increase of the ability to absorb energy.…”

Section: Introductionmentioning

confidence: 99%

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Bending Behavior of Lightweight Wood-Based Sandwich Beams with Auxetic Cellular Core

Peliński

Smardzewski

2020

Polymers

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The work concerns a three-point bending test of beams made of plywood, high density fibre boards, cardboard, and wood-epoxy mass. The goal of the investigation was to determine the effect of thickness and type of wood-based facings on stiffness, strength, ability to absorb, and dissipate the energy of sandwich beams with an auxetic core. The cognitive goal of the work was to demonstrate the possibility of using recycled materials for facings and cores instead of popular wood composites. Experimental studies and numerical calculations were performed on correctly calibrated models. Experimental studies have shown that the beams with HDF facings (E = 1528 MPa, MOR = 12.61 MPa) and plywood facings (E = 1248–1395 MPa, MOR = 8.34–10.40 MPa) have the most favourable mechanical properties. Beams with plywood facings also have a good ability to absorb energy (1.380–1.746 J), but, in this respect, the beams manufactured of HDF (2.223 J) exhibited better capacity. The use of an auxetic core and facings of plywood and cardboard significantly reduces the amount of dissipated energy (0.0093 J, 0.0067 J). Therefore, this type of structures can be used for modeling beams carrying high deflections.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bending Behavior of Lightweight Wood-Based Sandwich Beams with Auxetic Cellular Core

Peliński

Smardzewski

2020

Polymers

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“…Many studies deal with honeycomb sandwich panels and their usage in wood industry for the purpose of door filling, vertical, and horizontal elements of furniture body, package filling, etc. Sandwich panels should have minimum thickness of 25 mm to successfully replace particleboards without a significant deterioration in quality .…”

Section: Introductionmentioning

confidence: 99%

“…wood-based materials used in furniture industry, high thickness of the honeycomb panels (which is determined by the thickness ratio of the outer layers to the core) could be considered as their main disadvantage. [73] To achieve even thinner structure, studies are conducted to implement auxetic systems to the core structure, to decrease its initial thickness without deterioration to its overall stiffness and durability. [74][75][76] Auxetic structures improve both the overall stiffness and durability to the bending load of the panel.…”

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confidence: 99%

“…FEM method with the use of experimental data allows one to achieve satisfying results with project validation and detection of failure points, significantly narrowing the field of research and shortening the duration of work on new materials. [73][74][75][76][77][78][79][80][81][82][83][84][85][86] Some work have shown the bending mechanical performance of a new class of zero Poisson's ratio lattices designed for large out-of-plane morphing and deformations. The very large bending compliance of these lattices make them particularly interesting for cellular skin-morphing applications involving the use of composite materials.…”

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confidence: 99%

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Stiffness of Synclastic Wood‐Based Auxetic Sandwich Panels

Peliński

Smardzewski

Narojczyk

2020

Physica Status Solidi (b)

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The research in materials with auxetic properties [1] (i.e., exhibiting negative Poisson's ratio [2] at least in some directions) has been growing for about 30 years. The manufacturing of the first man-made auxetic foam by Lakes [3] as well as the formulation and solution of the first mechanical [4,5] and thermodynamic models [6,7] explaining their unusual mechanical properties sparked an ongoing interest and intense studies of these interesting novel materials. Over these past 30 years, the studies on auxetics diverge into different aspects. Among others, the search for auxetic properties in new materials, [8,9] the theoretical studies of various models exhibiting auxetic properties, [10-46] or the creation of auxetic composites [47,48] to enhance mechanical properties of materials. The latter is of particular importance if one considers practical applications of negative Poisson's ratio materials. [49-55] In this respect, auxetic structures [24,54,56-66] are interesting (among others) in terms of improving stiffness and durability of materials. They tend to form synclastic, sphere-like shapes instead of anticlastic curvature which is characteristic for common materials with positive Poisson's ratio, subjected to bending. [67-69] Nowadays in wood industry, furniture which were designed with the use of synclastic shapes, are typically made from bent steel frame (usually upholstered), plastics, or bent plywood. Technology of bent plywood is strictly connected with thermophysical treatment, mold casting, and temperature-pressure bending process. The process is both time-and resourceconsuming. Furthermore, with the development of each new shape, expensive procedure of a new mold preparation and implementation into technological process is required. This situation could be significantly improved by implementation of auxetic structures into the industry. Auxetic structures improve several of mechanical properties, especially shear, impact, and bending resistance. They also improve ability to absorb impact energy as well as improve overall stiffness of structure. [65,66] Despite promising results of mechanical characteristics in the work by Smardzewski, [70] concerning examination of multilayered sandwich panels, particularly honeycomb panels with auxetic core manufactured from wood-based materials, to the date, the literature lacks research on the use of auxetic structures in wood-based composites. International research is focused on innovative, light composites, that could reduce the cost of product manufacturing by reducing material usage and overall product weight. Thus, in effect reducing also costs related to logistics. [70,71] Such composites could replace typically used wood-based materials such as particleboard, low, medium, and high-density fiberboard (LDF, MDF, and HDF) or plywood. Many studies [67,72-78] deal with honeycomb sandwich panels and their usage in wood industry for the purpose of door filling, vertical, and horizontal elements of furniture body, package filling, etc. Sandwich panels should have ...

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3D Printing Auxetic Architectures for Hypertrophic Scar Therapy

Chow

Yick

Wong³

et al. 2022

Macro Materials & Eng

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Fitting the human body for different purposes such as flexible electronics and functional garments can be a challenging task. Pressure garments are used to treat hypertrophic scars (HSs)pr. However, they have often failed to provide consistent pressure during joint movement. To increase the therapy efficacy, the application is proposed of 3D printed thermoplastic polyurethane (TPU) with an auxetic architecture insert for pressure therapy. Auxetic material can undergo an out‐of‐plane bending into a synclastic curvature, which can easily accommodate the contours of the human body. In this study, the synclastic effect of the auxetic structure under out‐of‐plane bending is illustrated through finite element analysis (FEA) first. Next, the formability, structural deformation, and auxetic response of re‐entrant (RE) and double‐arrowhead (DAH) auxetic structures when loading by a spherical surface in out‐of‐plane direction are unprecedentedly evaluated experimentally and numerically. It can be observed the internal angle of auxetic structure plays an important role regarding shape formability. Nevertheless, the result of wear trial reveals this design facilitates a stable level of pressure during the body motion which promotes the recovery of HS. It is believed the characterized result of auxetic architectures not only contribute to HS therapy, but also any type of biomedical devices.

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Mathematical models and experimental data for HDF based sandwich panels with dual corrugated lightweight core

Cited by 20 publications

References 32 publications

Bending Behavior of Lightweight Wood-Based Sandwich Beams with Auxetic Cellular Core

Bending Behavior of Lightweight Wood-Based Sandwich Beams with Auxetic Cellular Core

Stiffness of Synclastic Wood‐Based Auxetic Sandwich Panels

3D Printing Auxetic Architectures for Hypertrophic Scar Therapy

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