Tunable Mechanical Metamaterials

Abstract

We have established the feasibility of creating mechanical metamaterials over a broad range of frequencies. We have shown that it is possible to have stress waves with negative dynamic effective modulus of elasticity or negative dynamic effective density within various windows of frequencies. We have indicated how one may design the microstructure of composites at several length scales in order to control stress waves over a range of wave-lengths, which has novel industrial and other applications. By controlling the spatial variation of anisotropy of the medium, stress waves can be made to follow desired trajectories, scattering can be controlled, and energy can be focused or dissipated

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Document Details

Document Type
Technical Report
Publication Date
Mar 31, 2011
Accession Number
ADA547020

Entities

People

  • Siavouche Nemat-nasser

Organizations

  • University of California Regents

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Human Systems

DTIC Thesaurus Topics

  • Anisotropy
  • Band Structures
  • Composite Materials
  • Elastic Properties
  • Energy Bands
  • Energy Management
  • Frequency
  • Materials
  • Mechanical Properties
  • Mechanics
  • Metamaterials
  • Microstructure
  • Modulus Of Elasticity
  • Scattering
  • Stress Waves
  • Stresses
  • Waves

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Mechanical Engineering/Mechanics of Materials.
  • Nanocomposite Materials Science

Technology Areas

  • Microelectronics