Measurement of Elastic Nonlinearities Using the Fundamental Edge Wave Mode

  • James Martin HughesEmail author
  • Andrei Kotousov
  • Ching-Tai Ng
Conference paper
Part of the Structural Integrity book series (STIN, volume 16)


Measurement of the nonlinear elastic properties of materials represents a great interest in engineering and materials science. Changes of these properties are often related to mechanical damage and applied stresses, which are paramount for maintaining integrity and safety of structures. Current ultrasonic techniques typically utilise bulk, Lamb, or Rayleigh waves to measure material nonlinearities, however, spatial and velocity dispersion make this a very difficult task, and the use of several (empirical) correction factors is usually required. In this work we suggest using the fundamental edge wave mode – a natural analogue of the classical Rayleigh wave propagating in a finite thickness plate – for the purpose of measuring elastic nonlinearities. Edge waves naturally avoid spatial dispersion as they are guided by the apex of a plate, thus avoiding the need for correction factors. Additionally, the fundamental edge wave mode can propagate long distances without significant attenuation under certain conditions. The outcomes of this study demonstrate that the measurement of material nonlinearities is achievable using the fundamental edge wave mode. A linear trend between the nonlinearity parameter and propagation distance is experimentally observed, which is predicated by theoretical studies. Therefore, potential applications of the fundamental edge wave mode are very promising for the evaluation of mechanical damage and measurement of applied or residual stresses.


Harmonic generation Edge waves Feature guided waves 



This work was supported by the Australian Research Council through DP160102233, LE170100079, DP200102300 and the Australian Research Training Program Scholarship. Their support is greatly appreciated.


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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.School of Mechanical EngineeringThe University of AdelaideAdelaideAustralia
  2. 2.School of Civil, Environmental, and Mining EngineeringThe University of AdelaideAdelaideAustralia

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