Optical evaluation of the wave filtering properties of graded undulated lattices

  title={Optical evaluation of the wave filtering properties of graded undulated lattices},
  author={G. Trainiti and Massimo Ruzzene},
  journal={Journal of Applied Physics},
We investigate and experimentally demonstrate the elastic wave filtering properties of graded undulated lattices. Square reticulates composed of curved beams are characterized by graded mechanical properties which result from the spatial modulation of the curvature parameter. Among such properties, the progressive formation of frequency bandgaps leads to strong wave attenuation over a broad frequency range. The experimental investigation of wave transmission and the detection of full wavefields… 

Figures from this paper

Comparison of Transmission Measurement Methods of Elastic Waves in Phononic Band Gap Materials

In this work, piezoelectric transducers are utilized to excite two additively manufactured three-dimensional cellular structures to measure the transmission factor and gain insight into the way the pieZoelectrics transducers convert the transmitted signal.

Wave attenuation and trapping in 3D printed cantilever-in-mass metamaterials with spatially correlated variability

It is demonstrated that the vibration attenuation profile is strictly related to the spatial profile of the variability, and that there exists an optimal disorder degree below which the attenuation bandwidth widens; for high disorder levels, the band gap mistuning annihilates the overall attenuation.

Elastic Wave Propagation in Lattice Metamaterials with Koch Fractal

In this study, the wave propagation properties of lattice metamaterials with Koch fractal structures are investigated in terms of band structures and directional wave propagation. The analytical

Elastic Wave Propagation in Hierarchical Honeycombs With Woodpile-Like Vertexes

This paper investigates the dispersion behavior of elastic wave propagation in hierarchical honeycombs using the finite element method in conjunction with the Bloch's theorem. The hierarchical

Controlling the deformation of metamaterials: Corner modes via topology

Topological metamaterials have invaded the mechanical world, demonstrating acoustic cloaking and waveguiding at finite frequencies and variable, tunable elastic response at zero frequency.

Hybrid Design Optimization of Sandwich Panels with Gradient Shape Anti-Tetrachiral Auxetic Core for Vibroacoustic Applications

This work proposes a novel two-dimensional (2D) graded core with anti-tetrachiral cells and evaluates the numerical vibroacoustic response of sandwich panels with these particular cores. First, a

Ray theory for elastic wave propagation in graded metamaterials



Experimental evidence of directivity-enhancing mechanisms in nonlinear lattices

In this letter, we experimentally investigate the directional characteristics of propagating, finite-amplitude wave packets in lattice materials, with an emphasis on the functionality enhancement due

Optical Measurement of In-plane Waves in Mechanical Metamaterials Through Digital Image Correlation

A Digital Image Correlation-based technique for the detection of in-plane elastic waves propagating in structural lattices and time snapshots and frequency contours in the spatial Fourier domain are compared with numerical predictions to illustrate the accuracy of the recorded wavefields.

Wave propagation in two-dimensional periodic lattices.

The techniques developed in this work can be used to design lattices with a desired band structure and the observed spatial filtering effects due to anisotropy at high frequencies (short wavelengths) of wave propagation are consistent with the lattice symmetries.

Gradient-index phononic crystal lens-based enhancement of elastic wave energy harvesting

We explore the enhancement of structure-borne elastic wave energy harvesting, both numerically and experimentally, by exploiting a Gradient-Index Phononic Crystal Lens (GRIN-PCL) structure. The

Gradient-index phononic crystals

Received 30 October 2008; revised manuscript received 13 January 2009; published 18 March 2009We designed and characterized a two-dimensional, gradient-index phononic crystal GRIN PC to controlthe

Effect of large deformation pre-loads on the wave properties of hexagonal lattices

We study linear wave propagation in nonlinear hexagonal lattices capable of undergoing large deformations, under different levels of pre-load. The lattices are composed of a set of masses connected

Phononic crystal Luneburg lens for omnidirectional elastic wave focusing and energy harvesting

We explore a phononic crystal Luneburg lens through design, fabrication, and analysis for omnidirectional elastic wave focusing and enhanced energy harvesting both numerically and experimentally. The