Mechanical properties of foam-filled hexagonal and re-entrant honeycombs under uniaxial compression

Luo, Hui Chen; Ren, Xin; Zhang, Yi; Zhang, Xiang Yu; Zhang, Xue Gang; Luo, Chen; Cheng, Xian; Xie, Yi Min

doi:10.1016/j.compstruct.2021.114922

Cited by 124 publications

(29 citation statements)

References 54 publications

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“…Despite all the efforts made in optimizing the original auxetic microstructure, filling proper foam into void auxetic metamaterials can also strengthen the cell walls of structure, preventing foam filled auxetic composites from buckling and shear failures. Luo et al (2022) filled foam into hexagonal and reentrant honeycombs, and studied their mechanical properties under uniaxial compression. The results indicated that the excellent combination shall be foam filler and reentrant honeycomb.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of in-plane uniaxial compression response of PU foam filled aluminum arrowhead auxetic honeycomb

Wu,

Ye,

Zhao

et al. 2024

RPJ

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Purpose Auxetics metamaterials show high performance in their specific characteristics, while the absolute stiffness and strength are much weaker due to substantial porosity. This paper aims to propose a novel auxetic honeycomb structure manufactured using selective laser melting and study the enhanced mechanical performance when subjected to in-plane compression loading. Design/methodology/approach A novel composite structure was designed and fabricated on the basis of an arrowhead auxetic honeycomb and filled with polyurethane foam. The deformation mechanism and mechanical responses of the structure with different structural parameters were investigated experimentally and numerically. With the verified simulation models, the effects of parameters on compression strength and energy absorption characteristics were further discussed through parametric analysis. Findings A good agreement was achieved between the experimental and simulation results, showing an evidently enhanced compression strength and energy absorption capacity. The interaction between the auxetic honeycomb and foam reveals to exploit a reinforcement effect on the compression performance. The parametric analysis indicates that the composite with smaller included angel and higher foam density exhibits higher plateau stress and better specific energy absorption, while increasing strut thickness is undesirable for high energy absorption efficiency. Originality/value The results of this study served to demonstrate an enhanced mechanical performance for the foam filled auxetic honeycomb, which is expected to be exploited with applications in aerospace, automobile, civil engineering and protective devices. The findings of this study can provide numerical and experimental references for the design of structural parameters.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of in-plane uniaxial compression response of PU foam filled aluminum arrowhead auxetic honeycomb

Wu,

Ye,

Zhao

et al. 2024

RPJ

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“…1b, when subjected to longitudinal compressive loading, structures with NPR shrink transversely, whereas conventional structures with a positive Poisson's ratio (PPR) expand. Recent studies have suggested that the combination of NPR skeletons and PPR soft matrices (Poisson ratio approaching the incompressibility limit of 0.5 [16]) would provide synergistic mechanical enhancement for two-phase composites such as foam or rubber-filled composites [17][18][19][20]. Nonetheless, the underlying enhancement mechanism for these designs must be revealed in greater detail.…”

Section: Introductionmentioning

confidence: 99%

A composite hydrogel exhibiting stiff response at low-strain regime by repulsion effect of positive/negative Poisson’s ratio

et al. 2023

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The application of hydrogels as substitutes for load-bearing tissues has garnered considerable attention. In contrast to load-bearing tissues, which can withstand complex loads with limited deformations, conventional hydrogels cannot exhibit a stiff response in the low-strain regime due to their soft natures. Herein, we reported the design of composite hydrogels inspired by the synergy between soft and hard constituents from load-bearing tissues. This design with a soft matrix (positive Poisson's ratio) and hard skeletons (negative Poisson's ratio) was up to 18.9 and 4.2 times stiffer than the matrix and skeleton, respectively. Instead, the combination of a soft matrix and skeletons with a positive Poisson's ratio showed limited improvement. The underlying mechanism by the repulsion effect of positive and negative Poisson's ratio between the soft matrix and hard skeletons was revealed using finite element analysis. This study offers insight into the future design of composite hydrogels based on the synergistic effect of soft and hard components.

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“…An emerging class of hybrid materials that overcomes this limitation, has been developed by combining lattices and closed-cell foams [26][27][28][29][30][31][32][33]. A pyramidal lattice core that uses polyurethane (PU) foam as filler, was developed to improve the energy absorption capacity and impact resistance [26].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Compressive Behavior of Hybrid Polyurethane(PU)-Foam-Filled Hyperbolic Chiral Lattice Metamaterial

Hou

et al. 2023

Polymers

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In this study, a novel hybrid metamaterial has been developed via fulfilling hyperbolic chiral lattice with polyurethane (PU) foam. Initially, both the hyperbolic and typical body-centered cubic (BCC) lattices are fabricated by 3D printing technique. These lattices are infiltrated in a thermoplastic polyurethane (TPU) solution dissolved in 1,4-Dioxane, and then freeze casting technique is applied to achieve the PU-foam-filling. Intermediate (IM) layers possessing irregular pores, are formed neighboring to the lattice-foam interface. While, the foam far from the lattice exhibits a multi-layered structure. The mechanical behavior of the hybrid lattice metamaterials has been investigated by monotonic and cyclic compressive tests. The experimental monotonic tests indicate that, the filling foam is able to soften the BCC lattice but to stiffen the hyperbolic one, further to raise the stress plateau and to accelerate the densification for both lattices. The foam hybridization also benefits the hyperbolic lattice to prohibit the property degradation under the cyclic compression. Furthermore, the failure modes of the hybrid hyperbolic lattice are identified as the interface splitting and foam collapse via microscopic analysis. Finally, a parametric study has been performed to reveal the effects of different parameters on the compressive properties of the hybrid hyperbolic lattice metamaterial.

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Mechanical properties of foam-filled hexagonal and re-entrant honeycombs under uniaxial compression

Cited by 124 publications

References 54 publications

Experimental and numerical study of in-plane uniaxial compression response of PU foam filled aluminum arrowhead auxetic honeycomb

Experimental and numerical study of in-plane uniaxial compression response of PU foam filled aluminum arrowhead auxetic honeycomb

A composite hydrogel exhibiting stiff response at low-strain regime by repulsion effect of positive/negative Poisson’s ratio

Investigation on the Compressive Behavior of Hybrid Polyurethane(PU)-Foam-Filled Hyperbolic Chiral Lattice Metamaterial

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