Dynamic response of sandwich panels with auxetic cores

Stręk, Tomasz; Jopek, Hubert; Nienartowicz, Maria

doi:10.1002/pssb.201552024

Cited by 107 publications

(64 citation statements)

References 67 publications

(83 reference statements)

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“…For example, an array of rotating rigid units can induce auxetic behavior, and this is one of the fundamental auxetic mechanisms according to some background on geometry3031323334353637. Many auxetic cellular and laminated composite solids can be designed from considerations of geometry and rotation3738394041424344.…”

mentioning

confidence: 99%

Orthotropic Laminated Open-cell Frameworks Retaining Strong Auxeticity under Large Uniaxial Loading

Tanaka

Suga

Iwata

et al. 2017

Sci Rep

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Anisotropic materials form inside living tissue and are widely applied in engineered structures, where sophisticated structural and functional design principles are essential to employing these materials. This paper presents a candidate laminated open-cell framework, which is an anisotropic material that shows remarkable mechanical performance. Using additive manufacturing, artificial frameworks are fabricated by lamination of in-plane orthotropic microstructures made of elbowed beam and column members; this fabricated structure features orthogonal anisotropy in three-dimensional space. Uniaxial loading tests reveal strong auxeticity (high negative Poisson’s ratios) in the out-of-plane direction, which is retained reproducibly up to the nonlinear elastic region, and is equal under tensile and compressive loading. Finite element simulations support the observed auxetic behaviors for a unit cell in the periodic framework, which preserve the theoretical elastic properties of an orthogonal solid. These findings open the possibility of conceptual materials design based on geometry.

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confidence: 99%

Orthotropic Laminated Open-cell Frameworks Retaining Strong Auxeticity under Large Uniaxial Loading

Tanaka

Suga

Iwata

et al. 2017

Sci Rep

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“…Strongly negative Poisson's ratio behavior near a phase transition has also been observed in computer simulations in the hard cyclic hexamer model . Negative Poisson's ratio can occur in designed two phase hierarchical composites with no void space, Recently, composite structures having no voids within their internal structure have been presented and their auxetic behaviors have been confirmed and studied …”

Section: Introductionmentioning

confidence: 68%

Three‐Dimensional Stiff Cellular Structures With Negative Poisson's Ratio

Liu

Lakes

2017

Physica Status Solidi (b)

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In this paper, a novel three‐dimensional (3D) cellular structure with negative Poisson's ratio was designed by alternating cuboid surface indents on the vertical ribs of the unit cells. The Poisson's ratio and Young's modulus of structures with different geometric parameters were determined using the finite element method (FEM) as a function of these parameters. Samples with identical geometric variables were fabricated via 3D printing, and their through‐thickness direction Poisson's ratios were measured and compared with simulation results. Results showed that the Poisson's ratio of the 3D cellular structures can be tuned from positive to negative and can reach a minimal value of −0.958. Good agreement was found between the experimental results and the simulation. This lattice structure is considerably stiffer than re‐entrant negative Poisson's ratio foam with the same solid phase. The design concept developed here can be optimized for specific applications via geometric parameters manipulation.

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“…[34,35] It is noted that other types of composites, e.g., laminate materials, could also have a Young's modulus greater than the Voigt limit because of the effects of the Poisson's ratios. [36][37][38][39][40] Thus, we could conclude that the type-I structure in Figure 1a can maximize the isotropic conductivity of two-phase composites, and that the type-II structure shown in Figure 1b can μ [23] μ [24] μ [25] μ [26] μ [27] Fig . 6.…”

Section: Resultsmentioning

confidence: 99%

Composite Materials with Enhanced Conductivities

2016

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The authors have analyzed the isotropic thermal/electrical conductivities of two types of specially structured composite materials. Closed-form results have been obtained for predicting the conductivities of the composites, and the accuracy has been verified by FE simulations. The obtained results in this paper are compared to the relevant theoretical predictions and experimental measurements. It has been demonstrated that the type-I composites have achieved a conductivity that is almost the same as the highest possible theoretical upper limit, and the type-II composites have a conductivity significantly greater than the experimental results of conventional isotropic composite materials.

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Dynamic response of sandwich panels with auxetic cores

Cited by 107 publications

References 67 publications

Orthotropic Laminated Open-cell Frameworks Retaining Strong Auxeticity under Large Uniaxial Loading

Orthotropic Laminated Open-cell Frameworks Retaining Strong Auxeticity under Large Uniaxial Loading

Three‐Dimensional Stiff Cellular Structures With Negative Poisson's Ratio

Composite Materials with Enhanced Conductivities

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