Compression and low velocity impact response of wood-based sandwich panels with auxetic lattice core

Abstract

The research determined the resistance to compression and low velocity impact of wood-based sandwich panels, the face sheet made of high-density fiber board, and high pressure laminate, while its auxetic lattice core was made by 3D printing using LayWood bio-composite filament. The core's auxetic property (i.e. exhibiting negative Poisson's ratio) was observed within the planes parallel to the facings. The ability of particular types of multilayer panels to absorb the energy was also determined. Based on the analysis of the obtained test results, it was proven that the core denoted as B, with inclination angle of the cell ribs $${{\varphi }_{x}=\varphi }_{y}=65^\circ$$ φ x = φ y = 65 ∘ , shows the highest compressive strength. It was determined that the dynamic load causes a very high overload in high-density fiber board face sheets. This results in damage to the sandwich panel surface and core structure. Cells of type B favorably minimize the differences in absorbed energy when using different face sheets and the energy value for low velocity impact. Taking into account the amount of absorbed energy, the most attractive is the panel with the D-type orthotropic core characterized by an inclination angle of the cell ribs $${\varphi }_{x}= 30^\circ , {\varphi }_{y}=60^\circ$$ φ x = 30 ∘ , φ y = 60 ∘ . The amount of energy absorbed by samples with high-density fiberboard face sheets increases significantly depending on the impactor's energy. For panels with face sheets manufactured from high-pressure laminate, the amount of energy absorbed decreases.

Flexural properties of lightweight carbon fiber/epoxy resin composite sandwiches with different fiber directions

“…The skin materials and core materials play a crucial role in the mechanical properties of the sandwiches. In previous studies, various skin materials and core materials were used to fabricate sandwich panels [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The skin materials are usually made of relatively high-strength materials, e.g.…”

Properties of sandwich boards with a core made of bio-composite particleboard containing wood particles and walnut shells

“…These boards, placed on both sides of the core, increased the strength by making the low-strength bio-composite particleboard an integral part of a much more durable structure. In this case, the external layers absorb and distribute the load and therefore, the implementation of such a solution allow for more effective and sustainable use of the materials with lower strength (Smardzewski et al 2021). It is also worth noting that although the covering led to a signi cant improvement in strength, the boards containing shells still demonstrated lower values when compared to the reference one.…”

Quasi‐Static Mechanical Properties of a Modified Auxetic Re‐Entrant Honeycomb Metamaterial

“…Recently, another type of auxetics based on ecological/natural materials (wood) was proposed by Krzysztof Pelinski, Jerzy Smardzewski, and coworkers. [17,18] Many researchers have investigated auxetic metamaterials and discovered more types of auxetic structures. [19][20][21][22][23] Auxetic structures have mechanical properties superior to conventional structures, [24][25][26][27][28] such as increased shear modulus, [29,30] good indentation resistance, [31,32] enhanced fracture toughness, [33] higher impact resistance, [34,35] variable stiffness, [36,37] and better energy absorption.…”