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Related Concept Videos

Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

311
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
311
Stress Concentrations01:24

Stress Concentrations

396
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
396
Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

284
Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...
284
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

351
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
351
Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

309
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
309

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Related Experiment Video

Updated: Oct 5, 2025

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Soft and disordered hyperuniform elastic metamaterials for highly efficient vibration concentration.

Hanchuan Tang1, Zhuoqun Hao1, Ying Liu1

  • 1School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.

National Science Review
|January 26, 2022
PubMed
Summary

Researchers developed a soft, disordered hyperuniform elastic metamaterial (DHEM) to capture weak, high-frequency vibrations. This novel material significantly concentrates vibration energy, paving the way for efficient green energy harvesting from everyday sources.

Keywords:
acoustic black holesdisordered hyperuniformityelastic metamaterialssoft materialsvibration concentration

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Area of Science:

  • Materials Science
  • Energy Harvesting
  • Acoustics

Background:

  • Vibrations are a ubiquitous energy source, yet efficiently harvesting dispersed, high-frequency vibrations remains a significant challenge due to weak amplitudes.
  • Existing methods struggle to capture energy from localized, high-frequency vibration sources effectively.

Purpose of the Study:

  • To introduce a novel soft and disordered hyperuniform elastic metamaterial (DHEM) for efficient vibration energy concentration.
  • To demonstrate the DHEM's capability to enhance weak, high-frequency vibrations across a broad spectrum.

Main Methods:

  • Fabrication and characterization of a soft and disordered hyperuniform elastic metamaterial (DHEM).
  • Experimental validation of vibration concentration capabilities across a wide frequency range (10 Hz to 10 kHz).
  • Assessment of the DHEM's performance under mechanical deformation for conformal applications.

Main Results:

  • The DHEM achieved a remarkable vibration energy concentration with a maximum enhancement factor of approximately 4000 at 1930 Hz.
  • The material demonstrated effectiveness across a broad frequency range, suitable for various real-world vibration sources.
  • The soft DHEM exhibited performance under deformation, allowing attachment to uneven surfaces.

Conclusions:

  • The developed DHEM offers a groundbreaking solution for harvesting dispersed vibration energy, particularly in the challenging high-frequency domain.
  • This technology has the potential to significantly reduce energy consumption by recovering dissipated vibrational energy from devices.
  • The findings pave the way for practical applications in green energy harvesting from common sources like appliances and transportation systems.