TY - GEN
T1 - A unified scheme for dislocation-induced acoustic nonlinearity
AU - Gao, Xiang
AU - Qu, Jianmin
N1 - Publisher Copyright:
© 2019 Author(s).
PY - 2019/5/8
Y1 - 2019/5/8
N2 - This study presents a unified approach to derive the acoustic nonlinearity parameter induced by dislocation motion in isotropic solids. It applies to various dislocation configurations, including dislocation strings (monopoles), dislocation dipoles, dislocation pileups and extended dislocations. The present approach reveals that the expressions of the acoustic nonlinearity parameters 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. Despite the dislocation density, semi-quantitative analysis demonstrates that the magnitude of acoustic nonlinearity parameters is dominated by the characteristic length of the dislocation configuration.
AB - This study presents a unified approach to derive the acoustic nonlinearity parameter induced by dislocation motion in isotropic solids. It applies to various dislocation configurations, including dislocation strings (monopoles), dislocation dipoles, dislocation pileups and extended dislocations. The present approach reveals that the expressions of the acoustic nonlinearity parameters 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. Despite the dislocation density, semi-quantitative analysis demonstrates that the magnitude of acoustic nonlinearity parameters is dominated by the characteristic length of the dislocation configuration.
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U2 - 10.1063/1.5099733
DO - 10.1063/1.5099733
M3 - Conference contribution
AN - SCOPUS:85066109333
T3 - AIP Conference Proceedings
BT - 45th Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 38
A2 - Laflamme, Simon
A2 - Holland, Stephen
A2 - Bond, Leonard J.
T2 - 45th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2018
Y2 - 15 July 2018 through 19 July 2018
ER -