Design and analysis of novel negative stiffness structures with significant energy absorption

Gholikord, Mohaddeseh; Etemadi, Ehsan; Imani, Mohammad; Hosseinabadi, Mahboubeh; Hu, Hong

doi:10.1016/j.tws.2022.110137

Cited by 25 publications

(2 citation statements)

References 66 publications

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“…nant from above 400 Hz. The tested structure then shows a distinctive characteristic that collocates it among the negative stiffness metamaterial, where properties depend on their architecture other than chemical composition [81,82]. However, although these structures have been described to have limitations in reusability after energy absorption [82], in the present and previous studies [83], the fabricated geopolymeric foams preserve the performances of negative stiffness structures in terms of energy absorption and keep their original configuration even after severe cyclic loading at 1000 Hz as depicted in Figure 7a for a sample that underwent the high-frequencies shear DMA test.…”

Section: Sound Absorption Coefficient Resultsmentioning

confidence: 99%

Acoustic Applications of a Foamed Geopolymeric-Architected Metamaterial

Ciaburro,

Iannace,

Ricciotti

et al. 2024

Applied Sciences

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The paper compares and evaluates the influence of the presence of perforations on the sound absorption coefficient (SAC) of a negative stiffness metamaterial based on a foamed ceramic geopolymer. Chemical–physical, microstructural, dynamic–mechanical, and sound characterisations are presented. A rigid, lightweight geopolymeric porous material has been prepared using an inorganic/organic monomeric mixture containing oligomeric sialates and siloxanes foamed with aluminium powder. This process results in an amorphous rigid light foam with an apparent 180 Kg/m3 density and a 78% open-pore. The viscoelastic characterisation by dynamic mechanical analysis (DMA) carried out from 10−3 to 103 Hz indicates the behaviour of a mechanical metamaterial with negative stiffness enabling ultrahigh energy absorption at straining frequencies from 300 to 1000 Hz. The material loss factor (the ratio of dissipative/elastic shear moduli) is about 0.03 (essentially elastic behaviour) for frequencies up to 200 Hz to suddenly increase up to a value of six at 1000 Hz (highly dissipative behaviour). The corresponding storage and loss moduli were 8.2 MPa and 20 MPa, respectively. Impedance tube acoustic absorption measurements on perforated and unperforated specimens highlighted the role of perforation-resonant cavities in enhancing sound absorption efficiency, particularly within the specified frequency band where the mass of the negative stiffness foamed geopolymer matrix magnifies the dissipation effect. In the limits of a still exploratory and comparative study, we aimed to verify the technological transfer potentiality of using architected metamaterials in sustainable building practices.

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Section: Sound Absorption Coefficient Resultsmentioning

confidence: 99%

Acoustic Applications of a Foamed Geopolymeric-Architected Metamaterial

Ciaburro,

Iannace,

Ricciotti

et al. 2024

Applied Sciences

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“…They investigated the mechanical behavior of the UC and 3D cubic NS lattice structures under compressive and tensile loadings through theoretical, FE simulation, and experimental studies. Gholikord et al [48], assembled the positive and negative stiffness members manufactured by FDM method as new NSSs and evaluated their energy absorption capabilities under cyclic loadings and verified the energy absorption values with FEM.…”

Section: Introductionmentioning

confidence: 99%

3D printed negative stiffness meta-structures with superior energy absorption and super-elastic shape-recovery features

Hosseinabadi

Etemadi

Serjouei

et al. 2023

Smart Mater. Struct.

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The aim of this paper is to create novel 3D cubic negative stiffness structures (NSSs) with superior mechanical performances such as high energy absorption, shape recovery, super-elasticity, and reversibility. The conceptual design is based on an understanding of geometrical influences, non-linear buckling-type instability, snap-through mechanism, elasto-plastic deformation growth and plastic hinges. A finite element (FE) based computational model with an elasto-plastic material behavior is developed to design and analyze NSSs, saving time, material, and energy consumption. Material samples and meta-structures are 3D printed by selective laser sintering printing method. Material properties are determined via mechanical testing revealing that the printing process does not introduce much anisotropy into the fabricated parts. Experimental tests are then conducted to study the behavior of novel designs under loading-unloading cycles verifying the accuracy of the computational model. A good correlation is observed between experimental and numerical data revealing the high accuracy of the FE modeling. The structural model is then implemented to digitally design and test NSSs. Effects of the geometrical parameters of the negative stiffness members under three cyclic loading are investigated, and their implications on the non-linear mechanical behavior of NSSs under cyclic loading are put into evidence, and pertinent conclusions are outlined. In addition, the dissipated energy and loss factor values of the designed structures are studied and the proposed UC is presented for the energy absorbing systems. The results show that the structural and geometry of energy absorbers are key parameters to improve the energy absorption capability of the designed structures. This paper is likely to fill a gap in the state-of-the-art NS meta-structures and provide guidelines that would be instrumental in the design of NSS with superior energy absorption, super-elasticity and reversibility features.

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Design and Performance Study of Metamaterial with Quasi-zero Stiffness Characteristics Based on Human Body Structure

Meng

Wang

et al. 2023

J. Vib. Eng. Technol.

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Design and analysis of novel negative stiffness structures with significant energy absorption

Cited by 25 publications

References 66 publications

Acoustic Applications of a Foamed Geopolymeric-Architected Metamaterial

Acoustic Applications of a Foamed Geopolymeric-Architected Metamaterial

3D printed negative stiffness meta-structures with superior energy absorption and super-elastic shape-recovery features

Design and Performance Study of Metamaterial with Quasi-zero Stiffness Characteristics Based on Human Body Structure

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