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Nonlinear elastodynamics in micro-inhomogeneous solids observed by head-wave based dynamic acoustoelastic testing.

G Renaud1, M Talmant, S Callé

  • 1Laboratoire d'Imagerie Paramétrique, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7623, Université Pierre et Marie Curie, Paris, France. renaud_gu@yahoo.fr

The Journal of the Acoustical Society of America
|January 10, 2012
PubMed
Summary
This summary is machine-generated.

Dynamic acoustoelastic testing reveals material nonlinearities using ultrasonic waves. This method accurately measures elastic and dissipative properties, offering insights into microstructural changes and material damage.

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Area of Science:

  • Solid Mechanics
  • Materials Science
  • Acoustics

Background:

  • Micro-inhomogeneous materials like granular and cracked solids exhibit complex acoustic nonlinearity.
  • Understanding these nonlinear acoustic properties is crucial for material characterization and damage assessment.
  • Dynamic acoustoelastic testing offers a comprehensive approach to study these phenomena.

Purpose of the Study:

  • To assess elastic and dissipative nonlinearities in solids using pulsed ultrasonic head waves and dynamic acoustoelastic testing.
  • To investigate the influence of low-frequency strain on material properties like elastic modulus and attenuation.
  • To analyze the acoustic nonlinearity in duralumin and limestone, including tensile-compressive behavior and hysteresis.

Main Methods:

  • Employing dynamic acoustoelastic testing with pulsed ultrasonic head waves.
  • Synchronizing ultrasound pulse sequences with low-frequency excitation to measure instantaneous variations.
  • Analyzing time of flight and energy modulations of ultrasonic waves induced by a standing wave.

Main Results:

  • In duralumin, weak quadratic elastic nonlinearity and no dissipative nonlinearity were observed.
  • Limestone exhibited asymmetric acoustic nonlinearity and hysteresis in elastic modulus and attenuation, with distinct tensile and compressive behaviors.
  • Acoustically induced conditioning reversibly modified acoustic nonlinearity, reducing tension-compression asymmetry.

Conclusions:

  • Dynamic acoustoelastic testing, particularly with head waves, is effective for metrology of acoustic nonlinearity.
  • The technique provides valuable insights into microstructural changes and damage accumulation in solids.
  • Observed modifications suggest nonequilibrium changes in the sources of acoustic nonlinearity.