Acoustic Nonlinearity Parameters Due to Microstructural Defects

Xiang Gao, Jianmin Qu

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

This study presents a general approach to derive the acoustic nonlinearity parameters induced by various types of dislocation configurations including dislocation strings (monopoles), dislocation dipoles, dislocation pileups and extended dislocations. It is found that expressions of the acoustic nonlinearity parameter induced by such a variety of dislocation configurations share a common mathematical form. They are all scaled with (Lch/b)n, where Lch is a characteristic length of the dislocation configuration, b is the magnitude of the Burgers vector, and n is either 3 or 4. Semiquantitative analysis is presented to compare the magnitudes of the acoustic nonlinearity parameters among different types of dislocation configurations.

Original languageEnglish
Pages (from-to)525-534
Number of pages10
JournalActa Mechanica Solida Sinica
Volume31
Issue number5
DOIs
StatePublished - 1 Oct 2018

Keywords

  • Acoustic nonlinearity parameter
  • Dislocations
  • Microstructural defects
  • Nondestructive evaluation
  • Nonlinear ultrasound

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