Experimental realization of a nonlinear acoustic lens with a tunable focus

Donahue, Carly M.; Anzel, Paul; Bonanomi, Luca; Keller, Thomas; Daraio, Chiara

doi:10.1063/1.4857635

Cited by 78 publications

(56 citation statements)

References 23 publications

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“…Arrays of tensegrity columns may indeed be employed to fabricate tunable focus acoustic lenses supporting extremely compact solitary waves. Such lattices can be subjected to different levels of prestress, so as to generate compact solitary waves with different phases within the lens, which will coalesce at a focal point [16,17] in an adjacent host medium (i.e., a material defect to be targeted). The 3D modeling presented in this work offers a very useful tool to simulate the mechanical response of such spatial arrays of tensegrity columns, and can also be used to deal with their design by computation.…”

Section: Discussionmentioning

confidence: 99%

“…The 3D modeling presented in this work offers a very useful tool to simulate the mechanical response of such spatial arrays of tensegrity columns, and can also be used to deal with their design by computation. As compared to acoustic lenses based on arrays of granular metamaterials [16,17], tensegrity acoustic lenses will profit from the adjustable width of compression solitary waves in such metamaterials (cf. Sect.…”

Section: Discussionmentioning

confidence: 99%

“…[21] to perform the time-integration of Eqn. (17). Such an algorithm prevents numerical violations of the rigidity constraint of the bars, ensuring that the bar vectors b k remain constant at each time step.…”

Section: Vector Form Of the Dynamics Of Tensegrity Networkmentioning

confidence: 99%

“…Equally, there is growing interest in research into noninvasive tools to target defects in materials, and for monitoring structural health in materials and structures [16,17,18,19]. Highly efficient and unconventional mechanisms for protecting materials and focusing mechanical waves through the use of rarefaction and compression solitary waves have recently been discovered by [4,15].…”

Section: Introductionmentioning

confidence: 99%

“…We show that our 3D modeling of tensegrity columns allows us to detect different strain wave profiles, as a function of the applied prestress, and a rigidity parameter describing the kinematics of the terminal bases. Such tunable response can be profitably used to build tensegrity actuators, which can subjected to different levels of prestress, so as to generate solitary waves with different phases that coalesce at a focal point in an adjacent host medium [16,17].…”

Section: Introductionmentioning

confidence: 99%

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Accurate Numerical Methods for Studying the Nonlinear Wave-Dynamics of Tensegrity Metamaterials

Fabbrocino¹,

Carpentieri²,

Amendola³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. This paper presents presents an effective numerical approach to the nonlinear dynamics of columns of tensegrity prisms subject to impulsive compressive loading. The equations of motions of the analyzed structures are formulated in vector form, by modeling the cables as deformable members and the bars as rigid bodies. The given numerical results investigate the wave dynamics of tensegrity columns, with focus on the propagation of compression solitary waves with variable size and amplitude throughout the system, as a function of the applied impact velocity and the state of prestress of the structure. The engineering potential of the examined structures as tunable acoustic actuators is discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Vector Form Of the Dynamics Of Tensegrity Networkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accurate Numerical Methods for Studying the Nonlinear Wave-Dynamics of Tensegrity Metamaterials

Fabbrocino¹,

Carpentieri²,

Amendola³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Tailoring Structure‐Borne Sound through Bandgap Engineering in Phononic Crystals and Metamaterials: A Comprehensive Review

Oudich

Gerard

Deng

et al. 2022

Adv Funct Materials

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In solid state physics, a bandgap (BG) refers to a range of energies where no electronic states can exist. This concept was extended to classical waves, spawning the entire fields of photonic and phononic crystals where BGs are frequency (or wavelength) intervals where wave propagation is prohibited. For elastic waves, BGs are found in periodically alternating mechanical properties (i.e., stiffness and density). This gives birth to phononic crystals and later elastic metamaterials that have enabled unprecedented functionalities for a wide range of applications. Planar metamaterials are built for vibration shielding, while a myriad of works focus on integrating phononic crystals in microsystems for filtering, waveguiding, and dynamical strain energy confinement in optomechanical systems. Furthermore, the past decade has witnessed the rise of topological insulators, which leads to the creation of elastodynamic analogs of topological insulators for robust manipulation of mechanical waves. Meanwhile, additive manufacturing has enabled the realization of 3D architected elastic metamaterials, which extends their functionalities. This review aims to comprehensively delineate the rich physical background and the state-of-the art in elastic metamaterials and phononic crystals that possess engineered BGs for different functionalities and applications, and to provide a roadmap for future directions of these manmade materials.

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Automated Optical‐Tweezers Assembly of Engineered Microgranular Crystals

Chizari

Lim

Shaw

et al. 2020

Small

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In this work a scalable automated approach for fabricating three-dimensional (3D) microgranular crystals consisting of desired arrangements of microspheres using holographic optical tweezers and two-photon polymerization is introduced. The ability to position microspheres as desired within lattices of any configuration allows designers to engineer the behavior of new metamaterials that enable advanced applications (e.g., armor that mitigates or redirects shock waves, acoustic lens for underwater imaging, damage detection, and non-invasive surgery, acoustic cloaking, and photonic crystals). Currently no self-assembly or automated approaches exist with the flexibility necessary to This article is protected by copyright. All rights reserved.2 place specific microspheres at specific locations within a crystal. Moreover, most pick-and-place approaches require the manual assembly of spheres one by one and thus do not achieve the speed and precision required to repeatably fabricate practical volumes of engineered crystals. In this paper, the rapid assembly of 4.86 μm-diameter silica spheres within differently packed 3D crystallattice examples of unprecedented size using fully automated optical tweezers is demonstrated. The optical tweezers independently and simultaneously assemble batches of spheres that are dispensed to the build site via an automated syringe pump where the spheres are then joined together within previously unattainable patterns by curing regions of photocurable prepolymer between each sphere using two-photon polymerization. Main TextMicrogranular crystals [1][2][3] have been a topic of much interest in recent years because of their Received: ((will be filled in by the editorial staff))Revised: ((will be filled in by the editorial staff))

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Experimental realization of a nonlinear acoustic lens with a tunable focus

Cited by 78 publications

References 23 publications

Accurate Numerical Methods for Studying the Nonlinear Wave-Dynamics of Tensegrity Metamaterials

Accurate Numerical Methods for Studying the Nonlinear Wave-Dynamics of Tensegrity Metamaterials

Tailoring Structure‐Borne Sound through Bandgap Engineering in Phononic Crystals and Metamaterials: A Comprehensive Review

Automated Optical‐Tweezers Assembly of Engineered Microgranular Crystals

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