Tailoring of Hysteresis Across Different Material Scales

Lacarbonara, Walter; Talò, Michela; Carboni, Biagio; Lanzara, Giulia

doi:10.1007/978-3-319-63937-6_13

Cited by 10 publications

(4 citation statements)

References 43 publications

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“…Dynamic modeling of systems with hysteresis is a complex mathematical problem attracting the attention of many researchers. Design models include the non-ideal relay, Preisach operator, and Ishlinsky model [ 41 , 42 , 43 , 44 , 45 , 46 ], and phenomenological models include the Bouc–Wen, Ivan, Duhem, etc. [ 47 , 48 , 49 ].…”

Section: Introductionmentioning

confidence: 99%

A Simple Model of the Energy Harvester within a Linear and Hysteresis Approach

et al. 2023

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In this article, a model of an energy harvester, the mechanical part of which is an inverted pendulum, is proposed. We investigated the stability of a linearized system. It was proven that the stabilizing control of the pendulum, based on the feedback principle, enables the stabilization of the system. We have identified the zones of stability and the amplitude–frequency characteristics. In the second part of this article, a generalization of the dynamic system for the case of the hysteresis friction in the mechanical joint is considered. The role of nonlinear effects within the design Preisach model and the phenomenological Bouc–Wen model is shown.

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Section: Introductionmentioning

confidence: 99%

A Simple Model of the Energy Harvester within a Linear and Hysteresis Approach

et al. 2023

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“…When the 1D nanofibers are carbon nanotubes (CNT), the elastic mismatch between the CNTs and the polymer matrix gives rise to high interfacial shear stresses which can overcome the weak van der Waals CNTpolymer interaction forces and cause interfacial sliding and, with it, energy dissipation [2][3][4]. This is an important source of material nonlinearity which has been referred to as stick-slip [5][6][7][8][9][10][11]. Experimentally acquired nonlinear oscillations in the lowest bending mode of cantilevers made of pure polybutylene terephthalate polymer (PBT) showed [10] that the response is hardening, as expected, due to the geometric nonlinearity of the bending curvature.…”

Section: Introductionmentioning

confidence: 99%

Unusual softening-to-hardening switching in branched carbon nanotube nanocomposites

Lacarbonara

Guruva²,

Carboni

et al. 2023

Preprint

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The unusual features of the nonlinear dynamic response of nanocomposite beams made of polybutylene terephthalate (PBT) and branched carbon nanotubes (bCNTs) are documented experimentally. The frequency response curves for cantilever specimens with different bCNTs weight fractions (wt%) are obtained under harmonic base excitations by measuring the free tip displacement via 3D scanning laser vibrometry. The steady-state response acquired for different excitation levels exhibits a surprising nonlinear softening trend which is switched into hardening for higher bCNTs wt% and increasing oscillation amplitudes. The stick-slip hysteresis, caused by the interaction of the bCNTs with the thermoplastic hosting matrix, determines a softening nonlinearity of the material that counteracts the well-known geometric hardening associated with the nonlinear curvature of the first mode of the cantilever. However, for bCNTs weight fractions greater than 1%, the bridging of the branched CNTs gives rise to the formation of a strong network which contributes to the hardening response at higher oscillation amplitudes. This mechanical behavior is detected by the trend of the nonlinear harmonic spectra and by the estimation of the equivalent damping ratio using the half power bandwidth method. A nonlinear mathematical model of the nanocomposite cantilever samples derived from a 3D mesoscale hysteretic model of the PBT/bCNT material is shown to predict the observed unusual experimental behavior. The presence of bCNTs in a thermoplastic matrix seems to be the main driver of the highly tunable nonlinear stiffness and damping capacity.

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“…Low-dimensional carbonaceous nanofillers as carbon nanotubes (CNTs), fullerenes, graphene platelets, and carbon nanofibers have been used in the past to improve both the mechanical and damping response of polymers. − The inclusion of these nanofillers within polymeric matrices benefits from an additional energy dissipation mechanism called stick–slip. , The stick–slip arises at the nanofiller–matrix interface and occurs when the interfacial shear stresses overcome the interatomic interaction forces between the polymer chains and the nanofiller outer surface. Such frictional sliding motion at the CNT/matrix interface has the advantage of being reversible and not involving significant degradation of the elastic properties. − …”

Section: Introductionmentioning

confidence: 99%

“Sliding Crystals” on Low-Dimensional Carbonaceous Nanofillers as Distributed Nanopistons for Highly Damping Materials

Talò

Lanzara

Krause

et al. 2019

ACS Appl. Mater. Interfaces

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Improving energy dissipation in lightweight polymer nanocomposites to achieve environmentally friendly and mechanically stable structures has reached a limit because of the low-density electrostatic interactions that can be harnessed through the stick–slip mechanism between carbonaceous nanofillers and polymeric chains wrapped around them. In this paper, the atomic friction between the two nanocomposite components is greatly amplified by locally increasing the density of the energetically higher noncovalent bonds. This gives rise to a new material design concept in which crystallite structures, nucleated around the carbonaceous nanofillers, become the source of enhanced energy dissipation. The rheological concept is a nanopiston unit consisting of a carbon nanotube (CNT) as a nanofiller coated with crystallite structures which, upon unconventionally and reversibly overcoming the interfacial interaction forces, monolithically roto-translate from an energetically stable state to the adjacent states. The efficiency of this novel “sliding crystals” mechanism is proven by its higher dissipation capability that turns out to be at least twice as much as that of the conventional CNT/polymer stick–slip within a larger strain range.

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Tailoring of Hysteresis Across Different Material Scales

Cited by 10 publications

References 43 publications

A Simple Model of the Energy Harvester within a Linear and Hysteresis Approach

A Simple Model of the Energy Harvester within a Linear and Hysteresis Approach

Unusual softening-to-hardening switching in branched carbon nanotube nanocomposites

“Sliding Crystals” on Low-Dimensional Carbonaceous Nanofillers as Distributed Nanopistons for Highly Damping Materials

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