Bioinspired Flexible and Programmable Negative Stiffness Mechanical Metamaterials

Tan, Xuezhi; Li, Yifeng; Wang, Lianchao; Yao, Kaili; Wang, Bing; Laude, Vincent; Kadic, Muamer

doi:10.1002/aisy.202200400

Cited by 35 publications

(6 citation statements)

References 59 publications

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“…In these previous studies on the mechanics and design of bi-stable mechanical materials, it was shown that these metamaterials have interesting properties in terms of energy absorption [22,60] and impact protection [61,62]. More recent studies have focused on the tuning of the BG and control of wave propagation in systems composed of bi-stable elements, including deformation of the metamaterials to achieve tuning of the BG by regulating the air pressure [63], controlling the temperature change [64,65], and applying an external load [66], all of which have shown some success.…”

Section: Introductionmentioning

confidence: 99%

3D bi-stable negative stiffness mechanical metamaterials for bandgap tuning

Qi,

Zhang,

Hong

et al. 2024

Smart Mater. Struct.

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A recent topic of interest in dynamics research is bi-stable negative stiffness (NS) mechanical metamaterials that allow for the efficient control of wave propagation and bandgap (BG) tuning. In this study, a three-dimensional (3D) bi-stable NS mechanical metamaterial based on fan-shaped inclined beams was developed. It has BGs in multiple directions as well as significant bandgap tuning capability in specific direction, and the ability to design for multiple geometrical parameters. First, the requirements for NS mechanical metamaterials to achieve bi-stable properties were theoretically investigated. Subsequently, the deformation process of the unit cell of the metamaterial under uniaxial compression and the band structure and vibrational properties of the metamaterial under different steady states were analyzed through a combination of finite element method (FEM) and experiments. The results showed that the BG range of the bi-stable NS metamaterials in the vertical direction changed with the switching of the steady state, whereas the out-of-plane BG in the horizontal direction remained constant. Therefore, this bi-stable NS mechanical metamaterial could realize modulation of the BG as well as control of wave propagation in multiple directions. In addition, bi-stable NS metamaterials with different angles exhibited different BG ranges. Finally, the vibrational transmittances of the metamaterials were investigated to verify the accuracy of the BG range.

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Section: Introductionmentioning

confidence: 99%

3D bi-stable negative stiffness mechanical metamaterials for bandgap tuning

Qi,

Zhang,

Hong

et al. 2024

Smart Mater. Struct.

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“…Metamaterials with tunable mechanical properties [11][12][13][14] , in particular having a rich dynamical behavior [15][16][17][18][19][20][21][22] or exhibiting non-reciprocity 23,24 , are extremely attractive for numerous applications, such as control of the propagation of acoustic and elastic waves [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] . Beyond the homogenization limit, the idea of dynamic shear, bulk, or mass density is commonly used and accepted for waves 41 .…”

Section: Introductionmentioning

confidence: 99%

Non-reciprocal and Non-Newtonian Mechanical Metamaterials

Wang

Martínez

Ulliac

et al. 2023

Preprint

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Non-Newtonian liquids are characterized by a stress and velocity-dependent dynamical response. In elasticity, and in particular in the field of phononics, reciprocity in the equations acts against obtaining a directional response for passive media. Active stimuli-responsive materials have been conceived to overcome it. Significantly, Milton and Willis have shown theoretically in 2007 that quasi-rigid bodies containing masses at resonance can display a very rich dynamical behavior, hence opening a route toward the design of non-reciprocal and non-Newtonian metamaterials. In this paper, we design a solid structure that displays unidirectional shock resistance, thus going beyond Newton’s second law in analogy to non-Newtonian fluids. We design the mechanical metamaterial with finite element analysis and fabricate it using 3D printing at the centimetric scale (with fused deposition modeling – FDM) and at the micrometric scale (with two-photon lithography – TPL). The non-Newtonian elastic response is measured via dynamical velocity-dependent experiments. Reversing the direction of the impact, we further highlight the intrinsic non-reciprocal response.

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“…This property signifies a material's ability to absorb and dissipate energy during impact or vibration exposure. Notably, superior energy absorption attributes directly translate to enhanced cushioning performance (Ganesh et al, 2022;Tan et al, 2023). Nonetheless, the viscosity of a material exerts a notable influence on its energy absorption properties (Huang et al, 2021;Saed et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Effects of extreme cyclic loading on the cushioning performance of human heel pads under engineering test condition

Qian,

Zhuang,

Liu

et al. 2023

Front. Bioeng. Biotechnol.

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Human heel pads commonly undergo cyclic loading during daily activities. Low cyclic loadings such as daily human walking tend to have less effect on the mechanical properties of heel pads. However, the impact of cyclic loading on cushion performance, a vital biomechanical property of heel pads, under engineering test condition remains unexplored. Herein, dynamic mechanical measurements and finite element (FE) simulations were employed to explore this phenomenon. It was found that the wavy collagen fibers in the heel pad will be straightened under cycle compression loading, which resulted in increased stiffness of the heel pad. The stiffness of the heel pads demonstrated an inclination to escalate over a span of 50,000 loading cycles, consequently resulting in a corresponding increase in peak impact force over the same loading cycles. Sustained cyclic loading has the potential to result in the fracturing of the straightened collagen fibers, this collagen breakage may diminish the stiffness of the heel pad, leading to a reduction in peak impact force. This work enhances understanding of the biomechanical functions of human heel pad and may provide potential inspirations for the innovative development of healthcare devices for foot complex.

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Bioinspired Flexible and Programmable Negative Stiffness Mechanical Metamaterials

Cited by 35 publications

References 59 publications

3D bi-stable negative stiffness mechanical metamaterials for bandgap tuning

3D bi-stable negative stiffness mechanical metamaterials for bandgap tuning

Non-reciprocal and Non-Newtonian Mechanical Metamaterials

Effects of extreme cyclic loading on the cushioning performance of human heel pads under engineering test condition

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