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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Local plasticity-induced nonlinear surface wave scattering in thick-walled structures.

Yuanman Zhang1, Shengbo Shan2, Li Cheng1

  • 1Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong; Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center, The Hong Kong Polytechnic University, Kowloon, Hong Kong.

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Summary

Early detection of damage in thick-walled structures (TWSs) is vital. This study reveals that nonlinear elastic waves scatter from incipient surface damage, generating detectable shear waves for structural health monitoring.

Keywords:
Local plasticityNonlinear elastic wavesThick-walled structuresWave-damage interaction

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Area of Science:

  • Structural Engineering
  • Materials Science
  • Nonlinear Acoustics

Background:

  • Thick-walled structures (TWSs) are critical load-bearing components requiring early damage detection for safety.
  • Nonlinear elastic-wave techniques offer promise for damage assessment but face challenges due to complex wave propagation in TWSs.

Purpose of the Study:

  • To investigate the scattering characteristics of nonlinear elastic waves interacting with localized plastic damage on TWS surfaces.
  • To understand the generation and propagation of nonlinear waves from incipient damage precursors.

Main Methods:

  • Utilized finite element simulations to model wave interactions.
  • Conducted experiments on meticulously manufactured TWSs with localized plasticized damage.
  • Analyzed the scattering features of nonlinear quasi-surface waves and generated shear bulk waves.

Main Results:

  • Nonlinear quasi-surface waves and shear bulk waves were generated upon interaction with the nonlinear material zone.
  • Scattered nonlinear shear waves showed strong, predictable directivity and high nonlinear energy content.
  • Shear waves were observed to scatter towards the opposite surface of the TWS.

Conclusions:

  • The study demonstrates the potential of nonlinear elastic wave scattering for detecting incipient surface damage in TWSs.
  • Generated nonlinear shear waves provide a viable means for damage localization due to their directivity and energy.
  • This research contributes to advancing structural health monitoring techniques for critical infrastructure.